Powertrain Control Module (PCM) - Electrical Diagnostics - 66RFE Automatic Transmission: Other RAM Cab & Chassis 3500 HD

WHEN MONITORED

Whenever the engine is running.

SET CONDITION

Immediately after a Overheat shift schedule is activated when the Transmission temperature exceeds 116° C or 240° F.

POSSIBLE CAUSES

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

With the engine running and the PCM commanded the Transmission Control Relay closed.

If battery voltage on the Transmission Control Relay Output Sense circuit(s) to the Powertrain Control Module (PCM) is less than 10.0 volts for 15 seconds. Note: P0562 generally indicates a gradually falling battery voltage or a resistive connection(s) to the PCM. The DTC will set if the battery voltage sensed at the PCM is less than 6.5 volts for 200ms or where Transmission Control Relay Output circuits are less than 7.2 volts for 200ms.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 743

Scheme 744

Scheme 745

1. RELATED CHARGING SYSTEM DTCS With the scan tool, read PCM DTCs. Are any related Charging System DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate charging related DTC diagnostic procedure. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 2 .
2. CHECK FOR TIPM DTCS NOTE: Generator, battery and charging system must be fully functional before performing this test. With the scan tool, read TIPM DTCs. Are any TIPM TCM Power Control Circuit DTCs present? Yes Refer to «TIPM - DIAGNOSIS AND TESTING»(ref-476553-S10470145732012060400000) and perform the appropriate diagnostic procedure. No Go To 3 .
3. P0562 ACTIVE With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter set at 0 for this DTC? Yes Go To 4 . No Go To 7 .
4. CHECK THE GROUND CIRCUITS Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12-volt test light connected to 12-volts, check the PCM Ground circuits at the appropriate terminals of the (special tool #8815A, Kit, NGC, 38 Position). NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly for the PCM Ground circuits? Yes Go To 5 . No Repair the Ground circuit(s) for an open or high resistance. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT Turn the ignition off to the lock position. NOTE: Check connectors - Clean/repair as necessary. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Ignition on, engine not running. Using a scan tool under TIPM, actuate the transmission control circuit. Using a 12-volt test light connected to ground, check all the (T16) Transmission Control Output circuits at the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminals of the (special tool #8815A, Kit, NGC, 38 Position). NOTE: The (T16) Transmission Control Output circuit branches off to both the Transmission Solenoid/TRS Assembly and PCM. Does the test light illuminate brightly during the actuation for all (T16) Transmission Control Output circuits? Yes Go To 6 . No Repair the excessive resistance in the (T16) Transmission Control Output circuit. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
6. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN Turn the ignition off to the lock position. Disconnect the TIPM C2 harness connector. Measure the resistance of the (T16) Transmission Control Output circuits from the TIPM C2 harness connector to the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminals of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms on any circuit? Yes Repair the excessive resistance in the (T16) Transmission Control Output circuit. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «3.7L, 4.7L & 5.7L - MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
7. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where there any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Generic software is checked at power-up

If generic software is found the MIL will light immediately. This DTC is designed to inform the technician that the controller has generic software installed.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

One time after the controller is reset (ignition turned to the RUN position).

When the Powertrain Control Module (PCM) detects an internal controller problem.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

One time after the controller is reset (ignition turned to the RUN position).

When the Powertrain Control Module (PCM) detects an internal controller problem.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1) One time after the controller is reset (ignition turned to the RUN position) and every 60 seconds thereafter. The Delay Test is executed after a reset only.

2) Two seconds after an invalid test.

If either of the following conditions occur three times

1) The watchdog fault line remains high after the period has elapsed for the too early - too late watchdog test.

2) The Transmission Control Output remains on after the watchdog delay expired.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on.

The DTC will set if the controller detects an invalid PRNDL code which lasts for more than 0.042 of a second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

SHIFT LEVER ERROR CODES

TRS SWITCH STATES

Continuously with the ignition on and engine running.

This DTC will set when the desired transmission temperature does not reach a normal operating temperature within a given time. Time is variable due to ambient temperature. Approximate times are starting temperature to warm up: (-40°C [-40°F] - 35 min) (-28°C [-20°F] - 25 min) (-6.6°C [20°F] - 20 min) (15.5°C [60°F] - 10 min).

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on and engine running.

The DTC will set when the monitored Temperature Sensor voltage drops below 0.078 volts for 0.45 of a second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 746

1. DETERMINE IF RELATED DTCS ARE PRESENT With the scan tool, read DTCs. Are any line pressure sensor or throttle position sensor DTCs present? Yes Perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 3 . No Go To 5 .
3. TRANSMISSION TEMPERATURE SENSOR Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, turn the Input/Output switch to OFF. With the scan tool, monitor the TRANS TEMP VOLTS while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator. Compare the scan tool readings with the numbers listed on the Transmission Simulator. Do the readings on the Transmission Simulator match the scan tool readings ± 0.2 volts? Yes Replace Transmission Solenoid/TRS Assembly in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). NOTE: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance between ground and the (T54) Transmission Temperature Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T54) Transmission Temperature Sensor Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on and engine running.

The DTC will set when the monitored Temperature Sensor voltage rises above 4.94 volts for 0.45 of a second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 747

1. DETERMINE IF RELATED DTCS ARE PRESENT With the scan tool, read DTCs. Are any line pressure sensor or throttle position sensor DTCs present? Yes Perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 3 . No Go To 5 .
3. TRANSMISSION TEMPERATURE SENSOR Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, turn the Input/Output switch to OFF. With the scan tool, monitor the TRANS TEMP VOLTS while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator. Compare the scan tool readings with the numbers listed on the Transmission Simulator. Do the readings on the Transmission Simulator match the scan tool readings ± 0.2 volts? Yes Replace Transmission Solenoid/TRS assembly in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. (T54) TRANSMISSION SENSOR SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors. Measure the resistance between the (T54) Transmission Temperature Sensor Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T54) Transmission Temperature Sensor Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the Transmission Temperature Sensor Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on and engine running.

The DTC will set when the monitored Temperature Sensor voltage fluctuates or changes abruptly within a predetermined period of time.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

The transmission gear ratio is monitored continuously while the transmission is in gear.

If there is an excessive change in input RPM in any gear. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 748

Scheme 749

Scheme 750

Scheme 751

Scheme 752

Scheme 753

1. CHECK TO SEE IF DTC P0716 IS CURRENT Start the engine in park. With the scan tool, monitor the Input Speed Sensor RPM. Is the Input Speed Sensor RPM below 400 RPM? Yes Go To 2 . No Go To 9 .
2. INPUT SPEED SENSOR Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, set the selector switch to 3000/1000 and the Input/Output switch to ON. With the scan tool, monitor the Input and Output Speed Sensor RPM. Does the Input speed read 3, 000 RPM and the Output speed read 1, 000 RPM ± 50 RPM? Yes Replace the Input Speed Sensor in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 3 .
3. (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition OFF to the LOCK position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). NOTE: Make sure to leave the Speed Sensor, Transmission Solenoid/TRS Assembly, and Line Pressure Sensor harness connectors disconnected. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Ignition ON, Engine Not Running. With the scan tool in TIPM, actuate the TCM output. Measure the voltage of the (T52) Input Speed Sensor Signal circuit. Is the voltage above 0.5 volts? Yes Repair the (T52) Input Speed Sensor Signal circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. (T13) SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE With the scan tool in TIPM, actuate the TCM output. Measure the voltage of the (T13) Speed Sensor Ground circuit. Is the voltage above 0.5 volts? Yes Repair the (T13) Speed Sensor Ground circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 5 .
5. (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN With the scan tool in TIPM, stop the actuation the TCM output. Turn the ignition OFF to the LOCK position. Measure the resistance of the (T52) Input Speed Sensor Signal circuit between the Input Speed Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T52) Input Speed Sensor Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. (T13) SPEED SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (T13) Speed Sensor Ground circuit between the Input Speed Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the Input Speed Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T52) Input Speed Sensor Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. (T13) SPEED SENSOR GROUND CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (T13) Speed Sensor Ground circuit. Is the resistance below 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
9. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

The transmission gear ratio is monitored continuously while the transmission is in gear.

If there is an excessive change in output RPM in any gear. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 754

Scheme 755

Scheme 756

Scheme 757

Scheme 758

1. CHECK TO SEE IF DTC P0721 IS CURRENT Turn the ignition OFF to the LOCK position. CAUTION: Properly support the vehicle and raise all drive wheels off the ground. Release the parking brake. Start the engine in park. Place the transmission gear selector in drive and release foot from brake. WARNING: Be sure to keep hands and feet clear of rotating wheels. With the scan tool, monitor the Output Speed Sensor RPM. Is the Output Speed Sensor RPM below 100 RPM? Yes Go To 2 . No Go To 9 .
2. OUTPUT SPEED SENSOR Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, set the selector switch to 3000/1000 and the Input/Output switch to ON. With the scan tool, monitor the Input and Output Speed Sensor RPM Does the Input Speed read 3, 000 RPM and the Output Speed read 1, 000 RPM, ± 50 RPM? Yes Replace the Output Speed Sensor in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 3 .
3. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T14) Output Speed Sensor Signal circuit from the Output Speed Sensor harness connector to the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 Ohms? Yes Repair the (T14) Output Speed Sensor Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. CHECK THE (T13) SPEED SENSOR GROUND CIRCUIT FOR AN OPEN Measure the resistance of the (T13) Speed Sensor Ground circuit from the Output Speed Sensor harness connector to the appropriate terminal in the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 5 .
5. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T14) Output Speed Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T14) Output Speed Sensor Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (T13) SPEED SENSOR GROUND CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T13) Speed Sensor Ground circuit. Is the resistance below 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Ignition ON, Engine Not Running. With the scan tool in TIPM, actuate the TCM output. Measure the voltage of the (T14) Output Speed Sensor Signal circuit. Is the voltage above 0.5 volts? Yes Repair the (T14) Output Speed Sensor Signal circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. CHECK THE (T13) SPEED SENSOR GROUND CIRCUIT FOR A SHORT TO VOLTAGE With the scan tool in TIPM, actuate the TCM output. Measure the voltage of the (T13) Speed Sensor Ground circuit. Is the voltage above 0.5 volts? Yes Repair the (T13) Speed Sensor Ground circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
9. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on, engine running and after the transmission achieves the correct gear ratio.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0729 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on, engine running and after the transmission achieves the correct gear ratio.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0731 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on, engine running, with the transmission in gear.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0732 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on, engine running, and after the transmission achieves the correct gear ratio.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0733 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on, engine running and after the transmission achieves the correct gear ratio.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0734 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on, engine running and after the transmission achieves the correct gear ratio.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0735 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on, engine running and after the transmission achieves the correct gear ratio.

If the ratio of the Input RPM to the Output RPM does not match the current gear ratio then DTC P0736 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

During Electronically Modulated Converter Clutch (EMCC) Operation.

Transmission must be in EMCC with input speed greater than 1750 RPM. The L/R-TCC Solenoid achieves the maximum duty cycle and can not pull engine speed within 60 RPM of input speed. Also when the transmission is in FEMCC and the engine slips TCC more than 100 RPM for 10 seconds then DTC P0740 will set. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Initially at power-up, then every 10 seconds after. The solenoid circuits will be tested immediately after a gear ratio or pressure switch error is detected.

After three consecutive solenoid continuity test failures or one failure if test is run in response to a gear ratio or pressure switch error.

Note. This DTC is strictly an electrical fault and cannot be caused by any internal transmission failure other than an open in the Transmission Solenoid/TRS Assembly. If the Transmission Solenoid/TRS Assembly is in need of replacement - do not replace the Valve Body.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 759

Scheme 760

Scheme 761

1. CHECK DTCS With the scan tool, read DTCs. Are any TIPM TCM Power Control Circuit or TCM Power Input DTCs present? Yes Refer to «TIPM - DIAGNOSIS AND TESTING»(ref-476553-S10470145732012060400000) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF DTC P0750 IS PRESENT Ignition ON, Engine Not Running. With the scan tool, erase all Transmission DTCs. Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, actuate the L/R Solenoid. Monitor the L/R Solenoid LED on the Transmission Simulator. Did the L/R Solenoid LED on the Transmission Simulator blink on and off? Yes Go To 3 . No Go To 5 .
3. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission Simulator connected, continue to actuate the L/R solenoid for two minutes. After two minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did DTC P0750 reset during the actuation test? Yes Go To 5 . No Go To 4 .
4. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission Simulator connected, continue to actuate the L/R solenoid for another two minutes while wiggling the related wiring harness and connectors. Stop the actuation and check for transmission DTCs. Did DTC P0750 reset during the actuation test? Yes Repair wiring harness or connectors as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Note: Do NOT replace the entire Valve Body. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE (T20) L/R SOLENOID CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors. Measure the resistance between the (T20) L/R Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T20) L/R Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T20) L/R Solenoid Control circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (T20) L/R SOLENOID CONTROL CIRCUIT FOR AN OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T20) L/R Solenoid Control circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T20) L/R Solenoid Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T20) L/R SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T20) L/R Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T20) L/R Solenoid Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

Initially at power-up, then every 10 seconds after. The solenoid circuits will be tested immediately after a gear ratio or pressure switch error is detected.

After three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.

Note. This DTC is strictly an electrical fault and cannot be caused by any internal transmission failure other than an open in the Transmission Solenoid/TRS Assembly. If the Transmission Solenoid/TRS Assembly is in need of replacement - do not replace the Valve Body.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 762

Scheme 763

Scheme 764

1. CHECK DTCS With the scan tool, read DTCs. Are any TIPM TCM Power Control Circuit or TCM Power Input DTCs present? Yes Refer to «TIPM - DIAGNOSIS AND TESTING»(ref-476553-S10470145732012060400000) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF DTC P0755 IS PRESENT Ignition ON, Engine Not Running. With the scan tool, erase all Transmission DTCs. Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, actuate the 2C Solenoid. Did the 2C Solenoid LED blink on and off on the Transmission Simulator? Yes Go To 3 . No Go To 5 .
3. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission simulator connected, continue to actuate the 2C solenoid for two minutes. After two minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did DTC P0755 reset during the actuation test? Yes Go To 5 . No Go To 4 .
4. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission simulator connected, continue to actuate the 2C solenoid for another two minutes while wiggling the related wiring harness and connectors. Stop the actuation and check for transmission DTCs. Did DTC P0755 reset during the actuation test? Yes Repair wiring harness or connectors as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Note: Do NOT replace the entire Valve Body. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE (T219) 2C CONTROL CIRCUIT SHORT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors. Measure the resistance between the (T219) 2C Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T219) 2C Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T219) 2C Control circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (T219) 2C CONTROL CIRCUIT FOR AN OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T219) 2C Control circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T219) 2C Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T219) 2C CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T219) 2C Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T219) 2C Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

Initially at power-up, then every 10 seconds after. The solenoid circuits will be tested immediately after a gear ratio or pressure switch error is detected.

After three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.

Note. This DTC is strictly an electrical fault and cannot be caused by any internal transmission failure other than an open in the Transmission Solenoid/TRS Assembly. If the Transmission Solenoid/TRS Assembly is in need of replacement - do not replace the Valve Body.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 765

Scheme 766

Scheme 767

1. CHECK DTCS With the scan tool, read DTCs. Are any TIPM TCM Power Control Circuit or TCM Power Input DTCs present? Yes Refer to «TIPM - DIAGNOSIS AND TESTING»(ref-476553-S10470145732012060400000) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF DTC P0765 IS PRESENT Ignition ON, Engine Not Running. With the scan tool, erase all Transmission DTCs. Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, actuate the UD Solenoid. Monitor the UD Solenoid LED on the Transmission Simulator. Did the UD Solenoid LED on the Transmission Simulator blink on and off? Yes Go To 3 . No Go To 5 .
3. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission simulator connected, continue to actuate the UD solenoid for two minutes. After two minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did DTC P0765 reset during the actuation test? Yes Go To 5 . No Go To 4 .
4. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission Simulator connected, continue to actuate the UD solenoid for another two minutes while wiggling the related wiring harness and connectors. Stop the actuation and check for transmission DTCs. Did DTC P0765 reset during the actuation test? Yes Repair wiring harness or connectors as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Note: Do NOT replace the entire Valve Body. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE (T59) UD CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors. Measure the resistance between the (T59) UD Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T59) UD Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T59) UD Control circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (T59) UD CONTROL CIRCUIT FOR AN OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T59) UD Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T59) UD Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T59) UD CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T59) UD Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T59) UD Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

Initially at power-up, then every 10 seconds after. The solenoid circuits will be tested immediately after a gear ratio or pressure switch error is detected.

After three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.

Note. This DTC is strictly an electrical fault and cannot be caused by any internal transmission failure other than an open in the Transmission Solenoid/TRS Assembly. If the Transmission Solenoid/TRS Assembly is in need of replacement - do not replace the Valve Body.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 768

Scheme 769

Scheme 770

1. CHECK DTCS With the scan tool, read DTCs. Are any TIPM TCM Power Control Circuit or TCM Power Input DTCs present? Yes Refer to «TIPM - DIAGNOSIS AND TESTING»(ref-476553-S10470145732012060400000) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF DTC P0770 IS PRESENT Ignition ON, Engine Not Running. With the scan tool, erase all Transmission DTCs. Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, actuate the 4C Solenoid. Monitor the 4C Solenoid LED on the Transmission Simulator. Did the 4C Solenoid LED on the Transmission Simulator blink on and off? Yes Go To 3 . No Go To 5 .
3. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission Simulator connected, continue to actuate the 4C solenoid for two minutes. After two minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did DTC P0770 reset during the actuation test? Yes Go To 5 . No Go To 4 .
4. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY With the Transmission Simulator connected, continue to actuate the 4C solenoid for another two minutes while wiggling the related wiring harness and connectors. With the scan tool, stop the actuation and check for transmission DTCs. Did DTC P0770 reset during the actuation test? Yes Repair wiring harness or connectors as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Note: Do NOT replace the entire Valve Body. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE (T259) 4C CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors. Measure the resistance between the (T259) 4C Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T259) 4C Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T259) 4C Control circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (T259) 4C CONTROL CIRCUIT FOR AN OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T259) 4C Control circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T259) 4C Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T259) 4C CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T259) 4C Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T259) 4C Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

Continuously with the ignition on and engine running.

The DTC will set if the L/R Pressure Switch reads open or closed at the wrong time in a given gear.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 771

Scheme 772

Scheme 773

1. CHECK FOR OTHER DTCS Ignition ON, Engine Not Running. With the scan tool, check for transmission DTCs. Are any Transmission Loss of Prime, TCM Power Input and/or TIPM TCM Power Control Circuit DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. If the DTC P0944 is present, perform its respective test first. No Go To 2 .
2. CHECK IF DTC P0841 IS PRESENT With the scan tool, check the Event Data for P0841. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Does the Event Data show DTC P0841? Yes Go To 3 . No Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform diagnostics for the DTC reported in the Event Data.
3. CHECK IF DTC SET IN REVERSE Does the Event Data show DTC P0841 set while in Reverse? Yes Go To 10 . No Go To 4 .
4. CHECK IF THE L/R PRESSURE SWITCH WAS CLOSED Does the Event Data show the L/R Pressure Switch reading CLOSED when DTC P0841 set? Yes Go To 5 . No Go To 14 .
5. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. Turn the Pressure Switch selector to L/R on the Transmission Simulator. With the scan tool, monitor the L/R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Did the L/R Pressure Switch state change from open to closed while pressing the Pressure Switch Test button on the Transmission Simulator? Yes Go To 6 . No Go To 10 .
6. CHECK WIRING AND CONNECTORS Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK IF DTC SET IN FIRST GEAR In the Event Data recorded earlier, does the Event Data show the Present Gear as first gear when DTC P0841 set ? Yes Go To 8 . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
8. CHECK IF THE NO. 1 CHECK BALL IS CUT OR DAMAGED Turn the ignition OFF to the LOCK position. Remove the Transmission Valve Body in accordance with the Service Information. Check the No. 1 Check Ball for any possible cuts or damage. Is the No. 1 Check Ball cut or damaged? Yes Replace the No. 1 Check Ball and check for clutch debris in the transmission oil pan. If there is excessive debris, perform internal repairs to the L/R Clutch assembly. Refer to «REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK IF THE REVERSE CARRIER SNAP RING IS DISLODGED Looking through the windows in the bottom of the case, check whether the snap ring at the front of the Reverse (center) Carrier has dislodged. NOTE: It may be necessary to pry the Input Annulus Gear Shell rearward to check this snap ring. Is the Reverse Carrier Snap Ring dislodged? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. CHECK THE (T50) L/R PRESSURE CONTROL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission) if connected in a previous step or disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T50) L/R Pressure Control circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T50) L/R Pressure Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 11 .
11. CHECK THE (T50) L/R PRESSURE CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T50) L/R Pressure Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T50) L/R Pressure Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 12 .
12. CHECK THE PCM POWERS AND GROUNDS Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK IF THE DTC RESETS With the scan tool, clear the DTC and road test the vehicle. Try to duplicate the conditions in which the DTC set using the Event Data recorded earlier. Did DTC P0841 reset? Yes Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 17 .
14. CHECK FOR LOW LINE PRESSURE In the Event Data recorded earlier, compare the Line Pressure and the Desired Line Pressure. Is the Line Pressure less than 40 psi, and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check for low fluid level. Check the Primary Oil Filter seal for a split, crack or improperly installed. Refer to the Service Information for the proper installation procedure. If the fluid level and Primary Oil Filter are OK, check the Main Regulator Valve in the Oil Pump in accordance with the Service Information. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 15 .
15. CHECK THE (T50) L/R PRESSURE CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect all PCM harness connectors. Measure the resistance between the (T50) L/R Pressure Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T50) L/R Pressure Control circuit and all other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T50) L/R Pressure Control circuit for a short to other circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 16 .
16. CHECK IF DTC RESETS With the scan tool, clear the DTC and road test the vehicle. Try to duplicate the conditions in which the DTC set using the Event Data recorded earlier. Did DTC P0841 reset? Yes Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 17 .
17. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

In any forward gear with engine speed above 1000 RPM, shortly after a shift and every minute after.

After a shift into a forward gear, with engine speed above 1000 RPM, the Powertrain Control Module (PCM) momentarily turns on element pressure to the clutch circuits that does not have pressure to identify the correct Pressure Switch closes. If the Pressure Switch does not close two times, the DTC sets.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 774

Scheme 775

Scheme 776

1. CHECK FOR RELATED DTCS With the scan tool, check for transmission DTCs Are any Loss of Prime, TIPM TCM Power Control Circuit and/or TCM Power Input DTCs present also? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. If DTC, P0944-LOSS OF PRIME is present, perform its respective test first. No Go To 2 .
2. CHECK IF DTC P0755 IS PRESENT With the scan tool, read DTCs. Is DTC P0755 present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 3 .
3. CHECK IF DTCS P0732, P0735 AND/OR P0846 ARE PRESENT With the scan tool, read DTCs. Are DTCs P0732, P0735 and/or P0846 present? Yes Go To 12 . No Go To 4 .
4. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 5 . No Go To 15 .
5. CHECK IF THE LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least five seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 psi in each position? Yes Go To 6 . No Go To 10 .
6. CHECK THE LINE PRESSURE SENSOR CONNECTION Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect the terminals and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE LINE PRESSURE SENSOR OPERATION Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the three line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) or 1.0 volt of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. COMPARE SCAN TOOL TO THE PRESSURE GAUGE Turn the ignition OFF to the LOCK position. Connect the (special tool #8259, Adapter, Pressure Test) and 0-300 psi (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500 and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500 and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500 and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings ± 10 psi? Yes Go To 11 . No Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
11. CHECK WIRING AND CONNECTORS Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Remove the (special tool #8259, Adapter, Pressure Test) and 0-300 psi (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Install the (special tool #8333A, Simulator, Transmission). On the Transmission Simulator, turn the Pressure Switch selector switch to 2C. Ignition ON, Engine Not Running. With the scan tool, monitor the 2C Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the 2C Pressure Switch. Did the 2C Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To 12 . No Go To 14 .
12. CHECK FOR EXCESSIVE DEBRIS Turn the ignition OFF to the LOCK position. Remove the (special tool #8333A, Simulator, Transmission). Remove and inspect the Transmission Oil Pan in accordance with the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK THE 2C HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the 2C clutch hydraulic circuit in the 2C/4C clutch retainer for leakage in accordance with the Service Information. NOTE: The 2C hydraulic clutch circuit contains a small bleed orifice and a small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the 2C clutch piston, piston seals and bleed orifice assembly. Refer to «VALVE BODY, REMOVAL»(ref-476564-S14623742542012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the 2C Accumulator piston and seals. Check for an extra check ball downstream from the No. 7 check ball pocket and repair as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
14. CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. Measure the resistance between the (T147) 2C Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T147) 2C Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T147) 2C Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. If the Event Data shows DTC P0845 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on, engine running and the transmission in gear.

The DTC is set if the 2C Pressure Switch reads open or closed at the wrong time in a given gear.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 777

Scheme 778

1. DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT Using the scan tool, check for transmission DTCs. Are TCM Power Input DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF THE DTC IS CURRENT Using the scan tool, check the Event Data. Does the Event Data show data for DTC P0846? Yes Go To 3 . No Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate symptom shown in the Event Data.
3. CHECK FOR MULTIPLE DTCS Using the scan tool, check for transmission DTCs. Are there two or more related pressure switch rationality DTCs present in addition to P0846? Yes Go To 4 . No Go To 7 .
4. CHECK IF ALL PRESSURE SWITCHES READ CLOSED Using the scan tool, check the Event Data for P0846. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Do all the pressure switches read CLOSED in the Event Data for P0846? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform the diagnostics for P0882. No Go To 5 .
5. CHECK IF ALL PRESSURE SWITCHES READ OPEN In the Event Data recorded earlier, do all the pressure switches read OPEN? Yes Go To 6 . No Go To 7 .
6. CHECK FOR LOW LINE PRESSURE In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above procedures. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
7. CHECK IF THE DTC SET IN PARK REVERSE OR NEUTRAL Using the scan tool, check the Event Data for P0846. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Does the Event Data show DTC P0846 set in Park, Reverse or Neutral? Yes Go To 12 . No Go To 8 .
8. CHECK IF THE 2C PRESSURE SWITCH READS CLOSED In the Event Data recorded earlier, does the Event Data show the 2C Pressure Switch reading CLOSED? Yes Go To 10 . No Go To 9 .
9. COMPARE THE LINE PRESSURE TO THE DESIRED LINE PRESSURE In the Event Data recorded earlier, compare the Line Pressure and the Desired Line Pressure. Is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 15 .
10. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, turn the Pressure Switch selector switch to the 2C position. Using the scan tool, monitor the 2C Pressure Switch while pressing the Pressure Switch test button on the Transmission Simulator. Did the state of the 2C Pressure Switch change while pressing the Pressure Switch Test button? Yes Go To 11 . No Go To 12 .
11. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
12. CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM C4 harness connector. Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T147) 2C Pressure Switch Sense circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T147) 2C Pressure Switch Sense circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T147) 2C Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T147) 2C Pressure Switch Sense circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 14 .
14. CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Measure the resistance between the (T147) 2C Pressure Switch Sense circuit and all the other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms? Yes Repair the (T147) 2C Pressure Switch Sense circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Using the scan tool, perform a Quick Learn procedure. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. CHECK IF THE NO. 5 AND/OR NO. 7 CHECK BALL IS CUT OR DAMAGED Turn the Ignition OFF to the LOCK position. Remove the Valve Body Assembly in accordance with the Service Information. Inspect the No. 5 and No. 7 check balls for any cuts or damage. Check for an extra check ball in the passage downstream from the No. 7 check ball pocket. Inspect the 2C accumulator piston and seals and also the 2C tower seal on top of the valve body. Where any problems found? Yes Repair as necessary. Check for excessive clutch debris in the transmission oil pan. If excessive clutch debris is present, repair 2C clutch as necessary. Refer to «A/T - REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 16 .
16. CHECK FOR EXCESSIVE FLUID LEAKAGE WITHIN 2C CLUTCH CIRCUIT Air check the 2C Clutch hydraulic circuit. Refer to the Service Information. NOTE: This hydraulic clutch circuit contains a small bleed orifice. Small leakage is considered normal. Was there excessive air leakage in the 2C Clutch hydraulic circuit? Yes Repair as necessary. Refer to «A/T - REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

Continuously while driving in a forward gear.

The Powertrain Control Module (PCM) continuously monitors Actual Line Pressure and compares this to Desired Line Pressure. If the Actual Line Pressure is more than 15 psi below Desired Line Pressure for 3.5 seconds continuously, this DTC will set.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 779

Scheme 780

Scheme 781

Scheme 782

1. CHECK FOR RELATED DTCS With the scan tool, read DTCs. Is DTC P0933 present? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform the appropriate diagnostic procedure for DTC P0933. No Go To 2 .
2. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 3 . No Go To 11 .
3. CHECK THE LINE PRESSURE SENSOR CONNECTION Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission. Did the Line Pressure reading on the scan tool CHANGE to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward? Yes (value was higher and changed to 207 kPa (30 psi) or 0.7 volts) Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No (value is higher than 207 kPa (30 psi) or 0.7 volts and did not change or the value was already 207 kPa (30 psi) or 0.7 volts and did not change) Go To 4 .
4. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure during the following steps. Using the Transmission Simulator, set the rotary knob to each of the three line pressure positions. NOTE: All three scan tool Line Pressure readings should be steady and ± 14 kPa (2.0 psi) or 0.1 volts of the reading specified on the Transmission Simulator. Did the Line Pressure read within ± 14 kPa (2.0 psi) or 0.1 volts in all three positions? Yes Go To 5 . No Go To 7 .
5. CHECK THE LINE PRESSURE SENSOR Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission) and reconnect all previously disconnected connectors. Install the (special tool #8259, Adapter, Pressure Test), and the (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Start the engine in park. Monitor the line pressure readings of both the scan tool and the pressure gauge and compare the two readings. Is the line pressure gauge reading within 34 kPa (5 psi) of the scan tool reading? Yes Go To 6 . No Replace the Line Pressure Sensor in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
6. CHECK FOR A PLUGGED TRANSMISSION OIL FILTER Turn the ignition OFF to the LOCK position. Remove and inspect the Transmission Oil Pan for excessive debris in accordance with the Service Information. Remove and inspect the Primary Oil Filter in accordance with the Service Information. NOTE: Make sure the Primary Transmission Oil Filter and/or O-ring is not cracked or split. Does the Oil Pan contain excessive debris and/or is the Primary Oil Filter cracked or plugged? Yes Repair the plugged, cracked or split Primary Transmission Oil Filter and/or O-ring. If the Primary Transmission Oil Filter is plugged, refer to the Service Information for the proper Hydraulic repair procedure. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Repair internal transmission and inspect the Transmission Oil Pump in accordance with the Service Information and replace if necessary. If no problem is found, replace the Solenoid/TRS Assembly. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
7. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the (special tool #8333A, Simulator, Transmission). Reconnect all previously disconnected connectors except the Line Pressure Sensor harness connector. Ignition ON, Engine Not Running. Measure the voltage of the (F856) 5-volt Supply circuit in the Line Pressure Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the (F856) 5-volt Supply circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 10 .
10. CHECK THE (T118) LINE PRESSURE VARIABLE FORCE SOLENOID CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect all PCM harness connectors. Measure the resistance between the (T118) Line Pressure Variable Force Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T118) Line Pressure Variable Force Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T118) Line Pressure Variable Force Solenoid Control circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
11. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously while driving in a forward gear.

The Powertrain Control Module (PCM) continuously monitors Actual Line Pressure. If the Actual Line Pressure reading is greater than the maximum desired line pressure used in the current gear, while the Pressure Control Solenoid duty cycle is at or near its maximum value (which should result in minimum line pressure) for 3.5 seconds continuously, the DTC will set.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 783

Scheme 784

1. CHECK FOR RELATED DTCS With the scan tool, read DTCs. Is DTC P0882 or P0933 present? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform the appropriate diagnostic procedure for DTC P0882 or P0933. No Go To 2 .
2. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 3 . No Go To 10 .
3. CHECK THE LINE PRESSURE SENSOR CONNECTION Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the transmission. Did the Line Pressure reading on the scan tool CHANGE to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward? Yes (value was higher and changed to 207 kPa (30 psi) or 0.7 volts) Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No (value is higher than 207 kPa (30 psi) or 0.7 volts and did not change or the value was already 207 kPa (30 psi) or 0.7 volts and did not change) Go To 4 .
4. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure during the following step. Using the Transmission Simulator, set the rotary switch to each of the 3 line pressure positions. NOTE: All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) or 0.1 volts of the reading specified on the Transmission Simulator. Did the Line Pressure read within ±14 kPa (2.0 psi) or 0.1 volts in all three positions? Yes Go To 5 . No Go To 6 .
5. CHECK THE LINE PRESSURE SENSOR CALIBRATION Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission) and reconnect all previously disconnected connectors. Install the (special tool #8259, Adapter, Pressure Test), and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Start the engine in park. Monitor the Line Pressure readings on the scan tool and the pressure gauge. Compare the Line Pressure readings between the scan tool and the pressure gauge. Is the pressure gauge reading within 34 kPa (5 psi) of the scan tool reading? Yes Repair the internal transmission and inspect the Transmission Oil Pump in accordance with the Service Information and replace if necessary. If no problem is found, replace the Transmission Solenoid/TRS Assembly, possible cause is a stuck Pressure Control Solenoid. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Line Pressure Sensor per the Service information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
6. CHECK THE (T118) LINE PRESSURE VARIABLE FORCE SOLENOID CONTROL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the Powertrain Control Module C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T118) Line Pressure Variable Force Solenoid Control circuit between the Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T118) Line Pressure Variable Force Solenoid Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T118) LINE PRESSURE VARIABLE FORCE SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T118) Line Pressure Variable Force Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T118) Line Pressure Variable Force Solenoid Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM C1 harness connector. Disconnect the Line Pressure Sensor harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

In a forward gear with engine speed above 1000 RPM, shortly after a shift and every minute after.

After a shift into a forward gear, with engine speed above 1000 RPM, the PCM momentarily turns on element pressure to the clutch circuits that does not have pressure to identify the correct Pressure Switch closes. If the Pressure Switch does not close 2 times, the DTC sets.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 785

Scheme 786

Scheme 787

1. CHECK FOR RELATED DTCS With the scan tool, check for transmission DTCs. Are any Loss of Prime, TCM Power Input and/or Line Pressure Sensor DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. If DTC P0944-LOSS OF PRIME is present, perform its respective test first. No Go To 2 .
2. CHECK FOR RELATED DTCS With the scan tool, read DTCs. Is DTC P2706 present? Yes Refer to «P2706-MS SOLENOID CIRCUIT»(ref-476622-S30192267842012060400000) and perform diagnostics for P2706-MS SOLENOID CIRCUIT. No Go To 3 .
3. CHECK FOR RELATED DTCS With the scan tool, check for transmission DTCs. Are DTCs, P0733, P0734, P0735 and/or P0871 present? Yes Go To 12 . No Go To 4 .
4. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 5 . No Go To 15 .
5. CHECK LINE PRESSURE Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least five seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa (85 and 95 psi) in each position? Yes Go To 6 . No Go To 10 .
6. CHECK THE LINE PRESSURE SENSOR CONNECTION Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE LINE PRESSURE SENSOR OPERATION Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the three line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) or 0.1 volts of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. CHECK THE (K856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (K856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (K856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK THE (K856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (K856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition OFF to the LOCK position. Connect the (special tool #8259, Adapter, Pressure Test) and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500 and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500 and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500 and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings ± 10 psi? Yes Go To 11 . No Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
11. CHECK PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the (special tool #8259, Adapter, Pressure Test) and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). On the Transmission Simulator, turn the Pressure Switch selector switch to OD. Ignition ON, Engine Not Running. With the scan tool, monitor the OD Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the OD Pressure Switch. Did the OD Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To 12 . No Go To 14 .
12. CHECK FOR EXCESSIVE DEBRIS Turn the ignition OFF to the LOCK position. Remove the (special tool #8333A, Simulator, Transmission). Remove and inspect the Transmission Oil Pan in accordance with the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Refer to the Service Information for the proper procedures. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK THE OD HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the OD hydraulic clutch circuit (in the case) for leakage in accordance with the Service Information. NOTE: The OD hydraulic clutch circuit contains a small bleed orifice which connects to the Reverse hydraulic clutch circuit. A small amount of air leakage is normal. Was excessive air leakage noticed during the air check? Yes Repair as necessary. Check the OD/Rev clutch piston seals, bleed orifice assembly, reaction shaft support seal rings, and machining of the main mating faces on the pump housing, pump valve body and reaction shaft support. Refer to «REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the OD Accumulator piston and seals. Check for an extra check ball downstream from the No. 6 check ball pocket and repair as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
14. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. Measure the resistance between the (T9) OD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T9) OD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T9) OD Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. If the Event Data shows DTC P0870 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on and engine running.

The appropriate DTC is set if one of the pressure switches are open or closed at the wrong time in a given gear.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 788

Scheme 789

1. CHECK DTCS With the scan tool, read DTCs. Are TCM Power Input DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK FOR LINE PRESSURE DTCS With the scan tool, read DTCs. Are Line Pressure DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 3 .
3. CHECK FOR OTHER PRESSURE SWITCH DTCS With the scan tool, check Transmission DTCs. Are there two or more pressure switch rationality DTCs present in addition to P0871? Yes Go To 5 . No Go To 4 .
4. CHECK IF DTC IS CURRENT With the scan tool, check and record the Event Data. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Does the Event Data show data for P0871? Yes Go To 8 . No Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure.
5. CHECK IF PRESSURE SWITCHES READ CLOSED With the scan tool, check and record the Event Data. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Do all the pressure switches read CLOSED in the Event Data? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform the diagnostic procedure for P0882. Follow instructions as if the DTC is current. No Go To 6 .
6. CHECK IF PRESSURE SWITCHES READ OPEN In the Event Data recorded earlier, do all the pressure switches read open? Yes Go To 7 . No Go To 8 .
7. CHECK FOR LOW LINE PRESSURE In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter weal for a spit, crack or improperly installed. If the filer and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above procedures. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
8. CHECK IF IN DTC SET IN PARK, NEUTRAL, OR REVERSE In the Event Data recorded earlier, does the Event Data show the OD Pressure Switch DTC set while in Park, Neutral or Reverse? Yes Go To 18 . No Go To 9 .
9. CHECK IF THE OD PRESSURE SWITCH IS OPEN In the Event Data recorded earlier, did the OD Pressure Switch read OPEN? Yes Go To 10 . No Go To 15 .
10. CHECK FOR LOW LINE PRESSURE In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level. Check the Primary Oil Filter seal for a split, crack or improperly installed. Refer to the Service Information for the proper installation procedure. If the fluid level and filter are OK, check the Main Regulator Valve in the Oil Pump. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 11 .
11. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition off to the lock position. Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Measure the resistance between the (T9) OD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T9) OD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T9) OD Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 12 .
12. CHECK IF THE DTC RESETS Reconnect all previously disconnected connectors. With the scan too, erase transmission DTCs. Test drive the vehicle, use the Event Data recorded earlier to help duplicate the conditions when the DTC set. Does DTC P0871 reset? Yes Go To 13 . No Go To 22 .
13. CHECK THE POWERTRAIN CONTROL MODULE (PCM) Remove the Transmission Control Relay. Operate the vehicle in Drive. Is the transmission slipping while in Drive? Yes Go To 14 . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the and program PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
14. CHECK INTERNAL TRANSMISSION Perform an Air Check Transmission Clutch Operation procedure in accordance with the Service Information. NOTE: The OD/Rev piston contains a small bleed orifice and a small amount of leakage between the OD and Reverse hydraulic clutch circuits is considered normal. Is there excessive air leakage in any clutch circuit? Yes Check the OD/Rev piston seals and bleed orifice, reaction shaft support seal rings, dribbler orifice assemblies in the reaction shaft support and for poor machine on the pump valve body faces. Refer to «REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Repair the Valve Body. Check the OD Accumulator piston and seals, OD bleed orifice and No. 6 check ball cuts or damage. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. CHECK PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, turn the Pressure Switch selector switch to OD. With the scan tool, monitor the OD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Did the state of the OD Pressure Switch change from OPEN to CLOSED while pressing the Test button? Yes Go To 16 . No Go To 18 .
16. CHECK IF THE NO. 4 AND/OR NO. 6 CHECK BALL IS CUT OR DAMAGED With the scan tool, erase previously stored DTCs and test drive the vehicle, use the Event Data to help duplicate the conditions when the DTC set. Note any DTCs that may set. Remove the Transmission Valve Body in accordance with the Service Information. Check the No. 4 and No. 6 Check Balls for cuts or damage. Is the No. 4 and/or No. 6 Check Ball cut or damaged? Yes Replace the No. 4 and/or No. 6 Check Ball and check for clutch debris in the transmission oil pan. If there is excessive debris, perform internal repairs to the OD Clutch Assembly. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 17 .
17. TRANSMISSION SOLENOID/TRS ASSEMBLY Did DTC P0871 reset during the test drive in the previous step? Yes Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 22 .
18. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Disconnect the Transmission Solenoid/TRS Assembly harness connector CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T9) OD Pressure Signal circuit between the Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T9) OD Pressure Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 19 .
19. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T9) OD Pressure Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T9) OD Pressure Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 20 .
20. CHECK WIRING AND CONNECTORS Using the schematics as a guide, inspect the wiring and connectors. Pay particular attention to all power and ground circuits. Were any problems found Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 21 .
21. CHECK IF DTC RESETS Reconnect all previously disconnected connectors. Make sure all Event Data is recorded. With the scan tool, erase previously stored DTCs and test drive the vehicle, use the Event Data to help duplicate the conditions when the DTC set. Does DTC P0871 reset? Yes Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 22 .
22. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

In a forward gear with engine speed above 1000 RPM, shortly after a shift and every minute after.

After a shift into a forward gear, with engine speed above 1000 RPM, the Powertrain Control Module (PCM) momentarily turns on element pressure to the clutch circuits that does not have pressure to identify the correct Pressure Switch closes. If the Pressure Switch does not close two times, the DTC sets.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 790

1. CHECK FOR RELATED DTCS With the scan tool, read DTCs. Are any Loss of Prime, TCM Power Input, and/or Line Pressure Sensor DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. If DTC, P0944-LOSS OF PRIME is present, perform its respective test first. No Go To 2 .
2. CHECK FOR DTC P0765 With the scan tool, read DTCs. Is DTC P0765 present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 3 .
3. CHECK FOR OTHER DTCS With the scan tool, read DTCs. Are DTCs, P0731, P0732, P0733, P0876 and/or P1736 present? Yes Go To 12 . No Go To 4 .
4. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 5 . No Go To 15 .
5. CHECK LINE PRESSURE Start the engine. Warm the transmission to 82° C (180° F). Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least five seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa (85 and 95 psi) in each position? Yes Go To 6 . No Go To 10 .
6. CHECK LINE PRESSURE SENSOR CONNECTION Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK LINE PRESSURE SENSOR OPERATION Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the three line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) 0.1 volts of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition OFF to the LOCK position. Connect the (special tool #8259, Adapter, Pressure Test) and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500 and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500 and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive and raise the RPM to 1500 and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings ± 10 psi? Yes Go To 11 . No Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
11. CHECK WIRING AND CONNECTORS Turn the ignition OFF to the LOCK position. Remove the (special tool #8259, Adapter, Pressure Test) and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). On the Transmission Simulator, turn the Pressure Switch selector switch to UD. Ignition ON, Engine Not Running. With the scan tool, monitor the UD Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the UD Pressure Switch. Did the UD Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To 12 . No Go To 14 .
12. CHECK FOR EXCESSIVE DEBRIS Turn the ignition OFF to the LOCK position. Remove the (special tool #8333A, Simulator, Transmission). Remove and inspect the Transmission Oil Pan in accordance with the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK THE UD HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the UD hydraulic clutch circuit (in the case) for leakage in accordance with the Service Information. NOTE: The UD hydraulic clutch circuit contains a small bleed orifice. A small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the UD clutch piston, piston seals and bleed orifice, reaction shaft support seal rings and machining of the main mating faces of the pump housing, pump valve body and reaction shaft support. Refer to «REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the UD Accumulator piston and seals. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
14. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. Measure the resistance between the (T29) UD Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T29) UD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T29) UD Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. If the Event Data shows DTC P0875 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on and engine running.

This DTC sets when the UD pressure switch is in the wrong state for the current gear. For example, this code would set if the UD pressure switch remained off while the transmission was in second gear.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 791

Scheme 792

Scheme 793

1. CHECK FOR RELATED DTCS With the scan tool, read DTCs. Are any TCM Power Input, Line Pressure, and/or Loss of Prime DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. If a Loss of Prime DTC is present, perform its respective test first. No Go To 2 .
2. CHECK FOR PRESSURE SWITCH DTCS Are two or more pressure switch rationality DTCs present in addition to P0876? Yes Go To 3 . No Go To 4 .
3. CHECK IF ALL PRESSURE SWITCHES READ CLOSED With the scan tool, read and record all Event Data. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Does the Event Data show all pressure switches reading CLOSED? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform diagnostics for P0882. Diagnose the symptom as if the DTC is current. No Go To 4 .
4. CHECK FOR OTHER DTCS With the scan tool, read DTCs. Is DTC P2704 present? Yes Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 5 .
5. CHECK THE EVENT DATA In the Event Data recorded earlier, does the Event Data display information for DTC P0876? Yes Go To 6 . No Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform diagnostics for the DTC listed in the Event Data.
6. CHECK IF EVENT DATA WAS SET IN PARK, NEUTRAL OR REVERSE In the Event Data recorded earlier, did DTC P0876 set in Park, Neutral or Reverse? Yes Go To 10 . No Go To 7 .
7. CHECK FOR UD PRESSURE SWITCH STATUS In the Event Data recorded earlier, did DTC P0876 set with the UD Pressure Switch closed? Yes Go To 10 . No Go To 8 .
8. CHECK LINE PRESSURE In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above procedures. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Measure the resistance between the (T29) UD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T29) UD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T29) UD Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, turn the Pressure Switch selector switch to the UD position. With the scan tool, monitor the UD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Did the state of the UD Pressure Switch change while pressing the Pressure Switch Test button? Yes Go To 14 . No Go To 11 .
11. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T29) UD Pressure Signal circuit from the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T29) UD Pressure Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 12 .
12. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T29) UD Pressure Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T29) UD Pressure Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. Measure the resistance between the (T29) UD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T29) UD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T29) UD Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
14. WIGGLE TEST USING THE TRANSMISSION SIMULATOR Perform the steps in the previous test while wiggling the wiring harness and connectors pertaining to the UD Pressure Switch. Did the state of the UD Pressure Switch change while pressing the Pressure Switch Test button? Yes Repair the wiring harness and/or connectors as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 15 .
15. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY Disconnect the Transmission Simulator and reconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Measure the resistance between ground and the (T29) UD Pressure Signal circuit in the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 ohms? Yes Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 16 .
16. CHECK IF THE DTC RESETS Reconnect all previously disconnected connectors. With the scan tool, erase all transmission DTCs. Test drive the vehicle. Using the Event Data recorded earlier, try to duplicate the conditions in which the DTC set. Does DTC P0876 reset? Yes Go To 17 . No Go To 18 .
17. CHECK FOR A CUT NO. 2 CHECK BALL Remove the Valve Body in accordance with the Service Information. Check the No. 2 check ball for cuts or damage. Is the No. 2 check ball cut or damaged? Yes Replace the No. 2 check ball. Check for excessive clutch debris in the oil pan. If excessive debris is present, check the UD Clutch and repair as necessary. Refer to «VALVE BODY, REMOVAL»(ref-476564-S14623742542012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Check for excessive clutch debris in the oil pan. If excessive debris is present, check the UD Clutch and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
18. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Were any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

When the ignition is turned from OFF position to RUN position and/or the ignition is turned from START position to RUN position.

This DTC is set when less than 3.0 volts are present at the transmission control relay output circuits at the Powertrain Control Module when the PCM is energizing the relay.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 794

Scheme 795

Scheme 796

Scheme 797

Scheme 798

1. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 0 for this DTC? Yes Go To 2 . No Go To 8 .
2. CHECK THE INTERNAL FUSED B(+) CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Ignition ON, Engine Not Running. Using a 12-volt test light connected to ground, check the internal Fused B(+) circuit in the Transmission Control Relay connector. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go To 3 . No Repair the internal Fused B(+) circuit for an open. If the fuse is open make sure to check for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
3. CHECK THE TRANSMISSION CONTROL RELAY Turn the ignition OFF to the LOCK position. Install a substitute relay in place of the Transmission Control Relay. Start the vehicle. With the scan tool, read DTCs. Did DTC P0882 reset? Yes Go To 4 . No Replace the Transmission Control Relay. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
4. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Disconnect the Transmission Solenoid/TRS Assembly harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Connect a jumper wire between the internal Fused B(+) circuit and the (T16) Transmission Control Output circuit in the Transmission Control Relay connector. Ignition ON, Engine Not Running. Using a 12-volt test light connected to ground, check all four (T16) Transmission Control Output circuits in the PCM C4 harness connector and Transmission Solenoid/TRS Assembly harness connector. Does the test light illuminate brightly on all four (T16) Transmission Control Output circuits? Yes Go To 5 . No Repair the (T16) Transmission Control Output circuit(s) for an open or high resistance. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR A SHORT TO GROUND Turn the ignition OFF to the LOCK position. Disconnect the TIPM C2 harness connector. Measure the resistance between ground and the (T16) Transmission Control Output circuit. Is the resistance below 5.0 ohms? Yes Repair the (T16) Transmission Control Output circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (T15) TRANSMISSION CONTROL CIRCUIT FOR A SHORT TO GROUND Disconnect the TIPM C1 harness connector. Measure the resistance of the (T15) Transmission Control circuit between ground and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Repair the (T15) Transmission Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. CHECK THE (T15) TRANSMISSION CONTROL CIRCUIT FOR AN OPEN Measure the resistance of the (T15) Transmission Control circuit between the TIPM C1 harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T15) Transmission Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
8. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

When the ignition is turned from OFF position to RUN position and/or the ignition is turned from START position to RUN position.

This DTC is set if the Powertrain Control Module (PCM) senses greater than 3.0 volts on the Transmission Control Relay Output circuits prior to a request from the PCM to energize the Transmission Control Relay.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 799

Scheme 800

1. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 0 for this DTC? Yes Go To 2 . No Go To 5 .
2. CHECK THE TRANSMISSION CONTROL RELAY Turn the ignition OFF to the LOCK position. Disconnect the Transmission Control Relay. Install a substitute relay. Ignition ON, Engine Not Running. With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 0 for this DTC? Yes Go To 3 . No Replace the Transmission Control Relay. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
3. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE Remove the Transmission Control Relay. Ignition ON, Engine Not Running. Measure the voltage at the (T16) Transmission Control Output circuit in the Transmission Control Relay connector. Is the voltage above 0.5 volts? Yes Repair the (T16) Transmission Control Output circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. CHECK THE (T15) TRANSMISSION CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition OFF to the LOCK position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect the TIPM C1 harness connector. Ignition ON, Engine Not Running. Measure the voltage of the (T15) Transmission Control circuit. Is the voltage above 0.5 volts? Yes Repair the (T15) Transmission Control circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

When Powertrain Control Module (PCM) initially powers up.

This DTC will set if the PCM powers up and senses the vehicle in a valid forward gear with no PRNDL DTCs and an output speed above 800 RPM, approximately 32 Km/h or 20 mph.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

When the ignition is turned from OFF position to RUN position and/or the ignition is turned from START position to RUN position.

This DTC is set if the Powertrain Control Module (PCM) senses voltage on any of the pressure switch inputs prior to the Transmission Control Relay being energized.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 801

1. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 0 for this DTC? Yes Go To 2 . No Go To 4 .
2. PRESSURE SIGNAL CIRCUITS SHORTED TO VOLTAGE Turn the ignition OFF to the LOCK position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Disconnect the Transmission Solenoid/TRS Assembly harness connector. Remove the Transmission Control Relay. NOTE: Note: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Connect a jumper wire between the internal Fused B(+) circuit and the Transmission Control Output circuit in the Transmission Control Relay connector. Ignition ON, Engine Not Running. Measure the voltage of the (T147) 2C, (T48) 4C, (T50) L/R, (T9) OD and (T29) UD Pressure Signal circuits in the (special tool #8815A, Kit, NGC, 38 Position). Is the voltage above 0.5 volts on any of the measured circuits? Yes Repair the (T147) 2C, (T48) 4C, (T50) L/R, (T9) OD and/or (T29) UD Pressure Signal circuit(s) for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 3 .
3. TRANSMISSION SOLENOID/TRS ASSEMBLY Turn the ignition OFF to the LOCK position. Remove the jumper wire. NOTE: Do not reinstall the Transmission Relay. Reconnect the Transmission Solenoid/TRS Assembly harness connector. Ignition ON, Engine Not Running. Measure the voltage of the (T147) 2C, (T48) 4C, (T50) L/R, (T9) OD and (T29) UD Pressure Signal circuits in the (special tool #8815A, Kit, NGC, 38 Position). Is the voltage above 0.5 volts on any of the sense circuits? Yes Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476551-S38836167022012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
4. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on, engine running and the transmission in gear.

The Powertrain Control Module (PCM) continuously monitors actual Line Pressure and compares it to Desired Target Line Pressure. If the Line Pressure reading is more than 172.4 kPa (25 psi) higher than the Desired Line Pressure, but is less than the highest Line Pressure used in the current gear, the DTC sets.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Continuously with the ignition on and engine running.

This DTC will set when the monitored Line Pressure Sensor voltage is less than or equal to 0.35 volts for 0.18 of a second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 802

Scheme 803

1. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 2 . No Go To 7 .
2. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the Totally Integrated Power Module (TIPM). CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, under Transmission Sensors, monitor the Line Pressure. Using the Transmission Simulator, set the rotary switch to each of the three line pressure positions. NOTE: The readings should be within ±14 kPa (2.0 psi) on the scan tool to the pressure readings specified on Transmission Simulator. Does the Line Pressure on the scan tool match the line pressures on the Transmission Simulator? Yes Replace the Line Pressure Sensor in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 3 .
3. CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition OFF to the LOCK position. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Disconnect the (special tool #8333A, Simulator, Transmission). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance between ground and the (T38) Line Pressure Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T38) Line Pressure Sensor Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. Measure the resistance of the (T38) Line Pressure Sensor Signal circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 Ohms? Yes Repair the (T38) Line Pressure Sensor Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 5 .
5. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C1 harness connector. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
7. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with ignition on and engine running.

This DTC will set if the monitored Line Pressure Sensor voltage is greater than or equal to 4.75 volts for 0.18 of a second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 804

Scheme 805

1. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 2 . No Go To 6 .
2. CHECK THE PCM AND WIRING Turn the ignition OFF to the LOCK position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure. Using the Transmission Simulator, set the rotary switch to each of the three line pressure positions. NOTE: The readings should be within ±14 kPa (2.0 psi) on the scan tool of the pressure reading specified on Transmission Simulator. Does the 3 line pressures on the scan tool match the Line pressure readings on the Transmission Simulator? Yes Replace the Line Pressure Sensor in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 3 .
3. CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM C2 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (K900) Sensor Ground circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (K900) Sensor Ground circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 4 .
4. CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). Measure the resistance of the (T38) Line Pressure Sensor Signal circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T38) Line Pressure Sensor Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 5 .
5. CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Ignition ON, Engine Not Running. With the scan tool under TIPM, actuate the Transmission. Measure the voltage of the (T38) Line Pressure Sensor Signal circuit. Is the voltage above 5.5 volts? Yes Repair the (T38) Line Pressure Sensor Signal circuit for a short to voltage. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
6. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

If the transmission is slipping in any forward gear and all the pressure switches are not indicating pressure, a loss of prime test is run.

If the transmission begins to slip in a forward gear and all the pressure switches are open a loss of prime test begins. Available elements are turned on by the PCM to see if pump prime exists. The DTC sets if no pressure switches respond.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

In a forward gear with engine speed above 1000 RPM, shortly after a shift and every minute after.

After a shift into a forward gear, with engine speed above 1000 RPM, the PCM momentarily turns on element pressure to the clutch circuits that does not have pressure to identify the correct Pressure Switch closes. If the Pressure Switch does not close two times, the DTC sets.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 806

1. DETERMINING IF RELATED DTCS ARE PRESENT With the scan tool, read DTCs. Are any Loss of Prime, TCM Control Input and/or Line Pressure Sensor DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. If DTC P0944 is present, perform its respective test first. No Go To 2 .
2. DTC P0770 PRESENT With the scan tool, read DTCs. Is DTC P0770 also present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 3 .
3. OTHER DTCS PRESENT With the scan tool, read DTCs. Are DTCs P0988 and/or P1736 present? Yes Go To 12 . No Go To 4 .
4. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 0 for this DTC? Yes Go To 5 . No Go To 15 .
5. LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C (180° F). Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least five seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa (85 and 95 psi) in each position? Yes Go To 6 . No Go To 10 .
6. CHECK LINE PRESSURE SENSOR CONNECTION Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa (30 psi) when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 7 .
7. LINE PRESSURE SENSOR OPERATION Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition ON, Engine Not Running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the three line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) or 0.1 volts of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SHIFTER, TRANSMISSION, REMOVAL»(ref-476551-S36679140282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 8 .
8. (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition OFF to the LOCK position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position). CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 9 .
9. (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
10. COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition OFF to the LOCK position. Connect the (special tool #8259, Adapter, Pressure Test) and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500 and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500 and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500 and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings ± 10 psi? Yes Go To 11 . No Replace the Line Pressure Sensor in accordance with the Service Information. Refer to «SENSOR, VARIABLE LINE PRESSURE, REMOVAL»(ref-476564-S42824715212012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
11. WIRING AND CONNECTORS Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Remove the (special tool #8259, Adapter, Pressure Test) and (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Install the (special tool #8333A, Simulator, Transmission). On the Transmission Simulator, turn the Pressure Switch selector switch to 4C. Ignition ON, Engine Not Running. With the scan tool, monitor the 4C Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the 4C Pressure Switch. Did the 4C Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To 12 . No Go To 14 .
12. CHECK FOR EXCESSIVE DEBRIS Turn the ignition OFF to the LOCK position. Remove the (special tool #8333A, Simulator, Transmission). Remove and inspect the Transmission Oil Pan in accordance with the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Refer to the Service Information for the proper procedures. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 13 .
13. CHECK 4C HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the 4C hydraulic clutch circuit (in the case) for leakage in accordance with the Service Information. NOTE: The 4C hydraulic clutch circuit contains a small bleed orifice. A small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the 4C clutch piston, piston seals and bleed orifice assembly. Refer to «REMOVAL»(ref-476564-S25559459282012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the 4C Accumulator piston and seals. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
14. (T48) 4C PRESSURE SIGNAL CIRCUIT SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. Measure the resistance between the (T48) 4C Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T48) 4C Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T48) 4C Pressure Signal circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. CHECK THE WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. If the Event Data shows DTC P0987 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously with the ignition on, engine running and the transmission in gear.

The DTC is set if the 4C Pressure Switch reads open or closed at the wrong time in a given gear.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 807

Scheme 808

1. DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read DTCs. Are TCM Power Input DTCs present? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476612-S24396498602012060400000) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK THE EVENT DATA With the scan tool, check the Event Data. Does the Event Data show data for DTC P0988? Yes Go To 3 . No Refer to «DIAGNOSIS AND TESTING»(ref-476612-S24396498602012060400000) and perform the appropriate diagnostic procedure.
3. MULTIPLE DTCS PRESENT With the scan tool, read DTCs. Are there two or more related Pressure Switch DTCs present in addition to P0988? Yes Go To 4 . No Go To 7 .
4. RELATED DTC PRESENT With the scan tool, check the Event Data for P0988. NOTE: Make sure to record all Event Data stored in the scan tool for future reference in this test procedure. Do all the pressure switches read CLOSED in the Event Data for P0988? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform diagnostics for DTC P0882. No Go To 5 .
5. EVENT DATA READ OPEN In the Event Data recorded earlier, do all the pressure switches read OPEN? Yes Go To 6 . No Go To 7 .
6. LOW LINE PRESSURE In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
7. DTC P0871 ALSO PRESENT With the scan tool, read DTCs. Is DTC P0871 present? Yes Refer to «DIAGNOSIS AND TESTING»(ref-476622-S01209992042012060400000) and perform the appropriate diagnostic procedure. No Go To 8 .
8. EVENT DATA READ PARK REVERSE OR NEUTRAL In the Event Data recorded earlier, does the Event Data show the DTC set in Park, Neutral or Reverse for P0988? Yes Go To 13 . No Go To 9 .
9. EVENT DATA READ CLOSED In the Event Data recorded earlier, does the Event Data show the 4C Pressure Switch reading CLOSED? Yes Go To 11 . No Go To 10 .
10. PRIMARY OIL FILTER SEAL In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to «PUMP, TRANSMISSION OIL, DISASSEMBLY»(ref-476564-S39732348712012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 15 .
11. CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATOR Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install the (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the Transmission Simulator, turn the Pressure Switch selector switch to the 4C position. With the scan tool, monitor the 4C Pressure Switch while pressing the Pressure Switch test button on the Transmission Simulator. Did the state of the 4C Pressure Switch change while pressing the Pressure Switch Test button? Yes Go To 12 . No Go To 13 .
12. TRANSMISSION SOLENOID/TRS ASSEMBLY Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
13. CHECK THE (T48) 4C PRESSURE SIGNAL CIRCUIT FOR AN OPEN Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM C4 harness connector. Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T48) 4C Pressure Signal circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T48) 4C Pressure Signal circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 14 .
14. CHECK THE (T48) 4C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T48) 4C Pressure Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T48) 4C Pressure Signal circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(ref-476533-S29192226892012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
15. NO. 5 CHECK BALL CUT OR DAMAGED Turn the Ignition off to the lock position. Remove the Valve Body Assembly in accordance with the Service Information. Inspect the No. 5 check ball for any cuts or damage. Inspect the 4C accumulator piston and seals and also the 4C tower seal on top of the valve body. Where any problems found? Yes Repair as necessary. Check for excessive clutch debris in the transmission oil pan. If excessive clutch debris is present, repair 4C clutch as necessary. Refer to the Service Information for proper repair procedures. Refer to «VALVE BODY, DISASSEMBLY»(ref-476564-S42647976142012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 16 .
16. EXCESSIVE FLUID LEAKAGE WITH 4C CLUTCH CIRCUIT Air check the 4C Clutch hydraulic circuit. Refer to the Service Information. NOTE: This hydraulic clutch circuit contains a small bleed orifice. Small leakage is considered normal. Was there excessive air leakage in the 4C Clutch hydraulic circuit? Yes Repair as necessary. Refer to the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to «ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL»(ref-476564-S01392498732012060400000) . Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

When the ignition is in the Run/Start position.

This DTC will set when the Powertrain Control Module (PCM) is disconnected from Fused B(+) or ground. It also sets while using the scan tool to perform a Battery Disconnect and/or Quick Learn procedure.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. POSSIBLE CAUSES This DTC is an informational DTC only. This DTC is set due to a momentary loss of power and/or the ground circuits to the PCM. Below are a list of possible causes associated with this DTC. Battery was disconnected. The battery disconnect feature (if equipped) on the scan tool was performed. A Quick Learn using the scan tool was performed. PCM was replaced or disconnected. Were any of the above possible causes performed? Yes This is the cause of the DTC. Erase the DTC and return vehicle to customer. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 2 .
2. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. NOTE: Check all power and ground circuits to the PCM for a intermittent or high resistance condition. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

When the PRNDL code indicates Temp 3.

This DTC sets when conditions for DTC P1776 are satisfied or 3 unsuccessful attempts to engage 1st gear while the shifter is in the temp 3 zone. This indicates a restricted port at the manual valve because the shifter is not fully engaged in the drive position.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

During an attempted shift into 1st gear.

This DTC is set if three unsuccessful attempts are made to shift the Solenoid Switch Valve (SSV) into the downshifted position in one given ignition start. This DTC can take up to five minutes before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 809

1. CHECK FOR RELATED DTCS With the scan tool, check for other transmission DTCs. Is DTC P0841 also present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 2 .
2. CHECK IF THE DTC IS CURRENT With the scan tool, read DTCs. Is the status Active or is the Starts Since Set counter 2 or less for this DTC? Yes Go To 3 . No Go To 6 .
3. CHECK THE PCM AND WIRING Turn the ignition off to the lock position. Remove the Ignition Switch Feed fuse from the TIPM. CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury. Install the Transmission Simulator (special tool #8333A, Simulator, Transmission). Ignition on, engine not running. With the Transmission Simulator, turn the Pressure Switch selector switch to L/R. With the scan tool, monitor the L/R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Did the state of the L/R Pressure Switch change while pressing the Pressure Switch Test button? Yes Go To 4 . No Go To 5 .
4. CHECK IF THE SOLENOID SWITCH VALVE STICKING Turn the ignition off to the lock position. Remove the Transmission Oil Pan in accordance with the Service Information. Remove the Transmission Valve body in accordance with the Service Information. Inspect the Solenoid Switch Valve and Plugs for sticking. Is the Solenoid Switch Valve or Plugs sticking? Yes Clean and inspect in accordance with the Service Information. Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
5. CHECK THE L/R PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect all PCM harness connectors. Measure the resistance between the (T50) L/R Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T50) L/R Pressure Switch Sense circuit and all other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T50) L/R Pressure Switch Sense circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
6. CHECK WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the Event Data to help identify the conditions in which the DTC set. Where any problems found? Yes Repair as necessary. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Test Complete.

Continuously when performing partial or full EMCC - PEMCC or FEMCC.

If the transmission senses the L/R pressure switch closing while performing PEMCC or FEMCC. This DTC will set after two unsuccessful attempts to perform PEMCC or FEMCC. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

The gear ratio is monitored continuously while the transmission is in gear.

After a controller reset in neutral and a ratio of input to output, of 1:2. This DTC can take up to five minutes of problem identification before illuminating the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

When the engine is running. The L/R Clutch Volume Index (CVI) is updated during a 3-1 or 2-1 manual AutoStick® (ERS) downshift with throttle angle below 5 degrees. Transmission temperature must be at least 43° C (110° F).

When the L/R clutch volume index CVI falls below 16.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

When the engine is running. The 2C Clutch Volume Index (CVI) is updated during a 3-2 or 4-2 kickdown with throttle angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).

When the 2C CVI falls below 5.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

When the engine is running. The OD Clutch Volume Index (CVI) is updated during a 3-4 upshift with throttle angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).

When the OD CVI falls below 5.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

When the engine is running. The UD Clutch Volume Index (CVI) is updated during a 5-4 kickdown with throttle angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).

When the UD CVI falls below 11.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

When the engine is running. The 4C Clutch Volume Index (CVI) is updated during a 4-5 upshift with throttle angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).

When the 4C CVI falls below 5.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Initially at power-up, then every 10 seconds after. The solenoid circuits will be tested immediately after a gear ratio or pressure switch error is detected.

After three consecutive solenoid continuity test failures or one failure if test is run in response to a gear ratio or pressure switch error. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 810

Scheme 811

Scheme 812

1. DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read Transmission DTCs Are any TCM Power Input DTCs present? Yes Refer to «3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500»(ref-476593) or «5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS»(ref-476601) and perform the appropriate diagnostic procedure. No Go To 2 .
2. TRANSMISSION SOLENOID/TRS ASSEMBLY Turn the ignition OFF to the LOCK position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install (special tool #8333A, Simulator, Transmission). Ignition ON, Engine Not Running. With the scan tool, actuate the MS Solenoid. Monitor the MS Solenoid LED on the Transmission Simulator. Did the MS Solenoid LED on the Transmission Simulator blink on and off? Yes Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 3 .
3. TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the MS Solenoid for the period of two minutes using the Transmission Simulator. After two minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did DTC P2706 reset during the actuation test? Yes Go To 4 . No Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .
4. (T118) MS SOLENOID CONTROL CIRCUIT SHORTED TO ANOTHER CIRCUIT Turn the ignition OFF to the LOCK position. Disconnect the (special tool #8333A, Simulator, Transmission). Disconnect the PCM harness connectors. Measure the resistance between the (T118) MS Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T118) MS Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T118) MS Solenoid Control circuit for a short to another circuit(s). Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 5 .
5. (T118) MS SOLENOID CONTROL CIRCUIT OPEN Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (T118) MS Solenoid Control circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 5.0 ohms? Yes Repair the (T118) MS Solenoid Control circuit for an open. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Go To 6 .
6. (T118) MS SOLENOID CONTROL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (T118) MS Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T118) MS Solenoid Control circuit for a short to ground. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to «66RFE TRANSMISSION VERIFICATION TEST»(ref-476622-S24726362902012060400000) .

Ignition on time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Ignition on time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

Bus messages not received from the Powertrain Control Module (PCM) for approximately two to five seconds.

Ignition on time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Continuously when the ignition is on.

The battery voltage between 10.0 and 16.0 Volts.

Ignition Off Draw (IOD) fuse installed.

Totally Integrated Power Module (TIPM) is configured correctly.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Continuously with the ignition on.

This DTC is set when the ERS message is not received or invalid.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to 66RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .