Diagnostic Starting Point - Engine Controls
Begin the system diagnosis with Diagnostic System Check - Alternative Fuels (Engine Controls) . The Diagnostic System Check-Engine Controls will provide the following information
- The identification of the control modules which command the system
- The ability of the control modules to communicate through the serial data circuit
- The identification of any stored diagnostic trouble codes (DTCs) and the codes' statuses
The use of the Diagnostic System Check-Engine Controls will identify the correct procedure for diagnosing the system and where the procedure is located.
Description
The Diagnostic System Check-Engine Controls is an organized approach to identifying a condition that is created by a malfunction in the engine control system. The Diagnostic System Check must be the starting point for any driveability concern. The Diagnostic System Check directs the service technician to the next logical step in order to diagnose the concern. Understanding and correctly using the diagnostic table reduces diagnostic time and prevents the replacement of good parts.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 1: Lack of communication may be because of a partial or a total malfunction of the class 2 serial data circuit. The specified procedure determines the particular condition.
- 2: Lack of communication may be because of a partial or a total malfunction of the class 2 serial data circuit. The specified procedure determines the particular condition.
- 3: The bi-fuel (KL6) vehicle and the dedicated CNG (KL8) vehicle require unique fuel injector control modules. DTC U0306 sets when the PCM detects an incorrect FICM has been installed for the vehicle application.
- 4: This step determines if the vehicle will start.
- 6: This step stores the powertrain control module (PCM) diagnostic trouble code (DTC) information into the scan tools memory. After you complete the diagnostic procedure, review the captured information in order to catch the next DTC if the control module stores multiple DTCs. Review the Freeze Frame/Failure Records data. Use this information in order to determine how frequently and how recently the DTC set. This information may help diagnose an intermittent condition. Information about the operating conditions at the time that the DTC set may also help diagnose an intermittent condition. Capturing the stored information saves the data that the PCM loses during the following conditions: When a diagnostic procedures instructs you to clear the DTCs. When a diagnostic procedure instructs you to disconnect the PCM connectors. When a diagnostic procedure instructs you to replace the PCM.
- 7: The presence of DTCs which begin with "U", indicate that some other module is not communicating. Following the specified procedure will gather all the available information before you perform the tests.
- 10: If there are other modules with DTCs set, refer to the DTC list. The DTC list directs you to the appropriate diagnostic procedure. If the control module stores multiple powertrain DTCs, diagnose the DTCs in the following order: Component level DTCs, such as sensor DTCs, solenoid DTCs, and relay DTCs. Diagnose the multiple DTCs within this category in numerical order. Begin with the lowest numbered DTC, unless the diagnostic table directs you otherwise. System level DTCs, for example, misfire DTCs, fuel trim DTCs, and catalyst DTCs.
- 12: This step determines if the vehicle will operate on the gasoline fuel system.
- 14: This step is for areas that have inspection and maintenance testing procedures for emissions testing. Use this step if the testing facility found one or more I/M system statuses that did not set.
| Step | Action | Yes | No |
|---|---|---|---|
| IMPORTANT: DO NOT perform this test if no driveability condition exists. Search for applicable bulletins before proceeding with the diagnosis. DO NOT turn OFF the ignition when performing this diagnostic table. DO NOT clear the DTCs unless the diagnostic instructs you to do so. If there is a condition with the starter system, refer to Diagnostic System Check - Engine Electrical in Engine Electrical in the G/H Van Service Manual. Ensure the battery is fully charged and the cables are clean and tight. Ensure the PCM and the fuel injector control module (FICM) grounds are clean, tight, and in the proper location. Ensure the CNG and the gasoline fuel tanks are at least 1/2 full. | |||
| 1 | Install a scan tool. Does the scan tool turn ON? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications in the G/H Van Service Manual |
| 2 | Attempt to establish communication with the listed control modules. If you are using a Tech 2, obtain the information with the Class 2 Message Monitor feature: Powertrain control module (PCM) Body control module (BCM) Instrument panel cluster (IPC) Electronic brake control module (EBCM) Driver information center (DIC) Heating ventilation air conditioning (HVAC) Does the scan tool communicate with all the listed control modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications in the G/H Van Service Manual |
| 3 | Select the DTC display function for the PCM. Does the scan tool display DTC U0306? | Go to Fuel Injection Control Module Replacement | Go to Step 4 |
| 4 | Attempt to start the engine. Does the engine start and idle? | Go to Step 5 | Go to DTC P1204 (KL8) |
| 5 | Select the DTC display function for the following control modules: BCM IPC EBCM HVAC Does the scan tool display any DTCs? | Go to Step 6 | Go to Step 11 |
| 6 | With a scan tool, select Captured Info in order to store the powertrain DTC information. Did you complete the action? | Go to Step 7 | |
| 7 | Does the scan tool display DTCs which begin with a "U" except U0306? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications in the G/H Van Service Manual | Go to Step 8 |
| 8 | Were any of the PCM DTCs P0601, P0602, or P1621 set? | Go to DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls in the G/H Van Service Manual | Go to Step 9 |
| 9 | Is DTC P0611 set? | Go to DTC P0611 | Go to Step 10 |
| 10 | Does the scan tool display DTC P0562, P0563, P1637, or P1638? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical in the G/H Van Service Manual | Go to Diagnostic Trouble Code (DTC) List |
| 11 | Is the vehicle equipped with the dedicated CNG fuel option (KL8)? | Go to Step 13 | Go to Step 12 |
| 12 | Start and idle the engine. Force a switch over to gasoline operation with the scan tool in the Alternative Fuels special functions, output controls menu. Does the engine continue to idle? | Go to Step 13 | Go to Engine Cranks but Does Not Run in the G/H Van Service Manual |
| 13 | Is the customer's concern with the Transmission? | Go to Diagnostic System Check - Automatic Transmission 4L80-E in Automatic Transmission in the G/H Van Service Manual | Go to Step 14 |
| 14 | Is the customer's concern with the inspection/maintenance (I/M) testing? | Go to Inspection/Maintenance (I/M) System Check in Engine Controls in the G/H Van Service Manual | Go to Step 15 |
| 15 | If the customer's concern is a symptom, refer to Symptoms - Engine Controls Did you find and correct the condition? | System OK | Go to Intermittent Conditions |
| IMPORTANT |
|---|
| DO NOT perform this test if no driveability condition exists. Search for applicable bulletins before proceeding with the diagnosis. DO NOT turn OFF the ignition when performing this diagnostic table. DO NOT clear the DTCs unless the diagnostic instructs you to do so. If there is a condition with the starter system, refer to Diagnostic System Check - Engine Electrical in Engine Electrical in the G/H Van Service Manual. Ensure the battery is fully charged and the cables are clean and tight. Ensure the PCM and the fuel injector control module (FICM) grounds are clean, tight, and in the proper location. Ensure the CNG and the gasoline fuel tanks are at least 1/2 full. |
Engine Controls Diagnostic System Check
Scan Tool Data List
| Scan Tool Parameter | Units Displayed | Cold Key On 1 | Cold Idle 1 | Hot Idle 1 | 55 MPH Cruise 2 |
|---|---|---|---|---|---|
| AFO Enable Circuit Status | FAULT/NO FAULT | NO FAULT | NO FAULT | NO FAULT | NO FAULT |
| AFO Command | ALT FUEL/GASOLINE | ALT FUEL | ALT FUEL | ALT FUEL | ALT FUEL |
| Consecutive CNG Starts | 0-100 | 0-100 | 0-100 | 0-100 | 0-100 |
| FICM Diagnostic Circuit Status | FAULT/NO FAULT | NO FAULT | NO FAULT | NO FAULT | NO FAULT |
| Fuel Gauge Select Switch | RELEASED/APPLIED | RELEASED | RELEASED | RELEASED | RELEASED |
| Fuel Indicator Lamp Command | ON/OFF | OFF | OFF | OFF | OFF |
| Fuel Mode Command | ALT FUEL/GASOLINE | ALT FUEL | ALT FUEL | ALT FUEL | ALT FUEL |
| Fuel Mode Lamp Circuit Status | FAULT/NO FAULT | NO FAULT | NO FAULT | NO FAULT | NO FAULT |
| Fuel Mode Switchover Reason | DTC SET/LOW FRP/LOW FTP/EXT. CRANK/100th START/ECT LOW TEMP/NOT SWITCHED | Varies | Varies | Varies | Varies |
| Fuel Rail Pressure Sensor | PSI | 160 to 165 psi | 160 to 165 psi | 160 to 165 psi | 160 to 165 psi |
| Fuel Rail Pressure Sensor | Volts | 3.7V-4.0V | 3.7V-4.0V | 3.7V-4.0V | 3.7V-4.0V |
| Fuel Rail Temperature Sensor | °C(°F) | Near IAT | Near IAT | Near IAT | Near IAT |
| Fuel Rail Temperature Sensor | Volts | Near IAT | Near IAT | 3.6 | 3.6 |
| Fuel Tank Pressure Sensor | PSI | 200 to 4000 psi | 200 to 4000 psi | 200 to 4000 psi | 200 to 4000 psi |
| Fuel Tank Pressure Sensor | Volts | Varies with Fuel Level | Varies with Fuel Level | Varies with Fuel Level | Varies with Fuel Level |
| Fuel Temperature Sensor | °C(°F) | Near IAT | Cooler than IAT | Cooler than IAT | Cooler than IAT |
| Fuel Temperature Sensor | Volts | 1.0V-4.5V | 1.0V-4.5V | 1.0V-4.5V | 1.0V-4.5V |
| HPL Relay Circuit Status | FAULT/NO FAULT | NO FAULT | NO FAULT | NO FAULT | NO FAULT |
| High Pressure Lockoff Relay Command | Fuel Flow/No Fuel Flow | Flow for 1 second then No Fuel Flow | Fuel Flow | Fuel Flow | Fuel Flow |
| LPL Relay Circuit Status | FAULT/NO FAULT | NO FAULT | NO FAULT | NO FAULT | NO FAULT |
| Low Pressure Lockoff Relay Command | Fuel Flow/No Fuel Flow | No Fuel Flow | Fuel Flow | Fuel Flow | Fuel Flow |
| 1 For Cold Key On, Cold Idle, and Hot Idle ensure the following driving conditions are met: Vehicle in PARK A/C turned OFF No power steering load All accessories OFF Brake pedal released 2 For 89 km/h (55 mph) cruise ensure the following driving conditions are met: Vehicle in Drive AC turned ON No power steering load Record the data after driving for approximately 1.6 km/h (1 mile). | |||||
Scan Tool Data List
Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Fuel Mode Indicator Lamp | Controls the fuel mode indicator lamp (FIL). The commanded states include None, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. | |
| AFO Signal Enable | Controls the AFO enable signal command. The commanded states include None, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. | |
| Fuel Gauge | Controls the fuel gauge. The PCM sends a serial data message to the IPC in order to control the gauge. The gauge will display full when commanded ON, and empty when commanded OFF. | |
| High Pressure Lock-Off | Controls the high pressure lock-off (HPL) relay. The commanded states include None, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. While operating on CNG the HPL relay is commanded ON. | |
| Low Pressure Lock-Off | Controls the low pressure lock-off (LPL) relay. The commanded states include None, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. While operating on CNG the LPL relay is commanded ON. | |
| Forced Fuel Switch over | Controls which fuel system the vehicle is operating on. Fuel system can be switched from CNG to Gasoline, and Gasoline to CNG. A switch over from Gasoline to CNG will be disabled if the pressure in the CNG fuel tank is below 896 kPa (130 psi). |
Scan Tool Output Controls
Diagnostic Trouble Code (DTC) List
| DTC | Diagnostic Procedure | Module(s) |
|---|---|---|
| P0005 | DTC P0005 | PCM 1 |
| P0068 | DTC P0068 in Engine Controls in the G/H Van Service Manual | PCM |
| P0101 | DTC P0101 (Without Throttle Actuator Control) DTC P0101 (With Throttle Actuator Control) in Engine Controls in the G/H Van Service Manual | PCM |
| P0102 | DTC P0102 in Engine Controls in the G/H Van Service Manual | PCM |
| P0103 | DTC P0103 in Engine Controls in the G/H Van Service Manual | PCM |
| P0106 | DTC P0106 (Without Throttle Actuator Control) DTC P0106 (With Throttle Actuator Control) in Engine Controls in the G/H Van Service Manual | PCM |
| P0107 | DTC P0107 in Engine Controls in the G/H Van Service Manual | PCM |
| P0108 | DTC P0108 in Engine Controls in the G/H Van Service Manual | PCM |
| P0112 | DTC P0112 in Engine Controls in the G/H Van Service Manual | PCM |
| P0113 | DTC P0113 in Engine Controls in the G/H Van Service Manual | PCM |
| P0116 | DTC P0116 in Engine Controls in the G/H Van Service Manual | PCM |
| P0117 | DTC P0117 in Engine Controls in the G/H Van Service Manual | PCM |
| P0118 | DTC P0118 in Engine Controls in the G/H Van Service Manual | PCM |
| P0121 | DTC P0121 in Engine Controls in the G/H Van Service Manual | PCM |
| P0122 | DTC P0122 in Engine Controls in the G/H Van Service Manual | PCM |
| P0123 | DTC P0123 in Engine Controls in the G/H Van Service Manual | PCM |
| P0125 | DTC P0125 in Engine Controls in the G/H Van Service Manual | PCM |
| P0128 | DTC P0128 in Engine Controls in the G/H Van Service Manual | PCM |
| P0131 | DTC P0131 or P0151 in Engine Controls in the G/H Van Service Manual | PCM |
| P0132 | DTC P0132 or P0152 in Engine Controls in the G/H Van Service Manual | PCM |
| P0133 | DTC P0133 or P0153 in Engine Controls in the G/H Van Service Manual | PCM |
| P0134 | DTC P0134 or P0154 in Engine Controls in the G/H Van Service Manual | PCM |
| P0135 | DTC P0135, P0141, P0155, or P0161 in Engine Controls in the G/H Van Service Manual | PCM |
| P0136 | DTC P0136 or P0156 in Engine Controls in the G/H Van Service Manual | PCM |
| P0137 | DTC P0137 or P0157 in Engine Controls in the G/H Van Service Manual | PCM |
| P0138 | DTC P0138 or P0158 in Engine Controls in the G/H Van Service Manual | PCM |
| P0140 | DTC P0140 or P0160 in Engine Controls in the G/H Van Service Manual | PCM |
| P0141 | DTC P0135, P0141, P0155, or P0161 in Engine Controls in the G/H Van Service Manual | PCM |
| P0151 | DTC P0131 or P0151 in Engine Controls in the G/H Van Service Manual | PCM |
| P0152 | DTC P0132 or P0152 in Engine Controls in the G/H Van Service Manual | PCM |
| P0153 | DTC P0133 or P0153 in Engine Controls in the G/H Van Service Manual | PCM |
| P0154 | DTC P0134 or P0154 in Engine Controls in the G/H Van Service Manual | PCM |
| P0155 | DTC P0135, P0141, P0155, or P0161 in Engine Controls in the G/H Van Service Manual | PCM |
| P0156 | DTC P0136 or P0156 in Engine Controls in the G/H Van Service Manual | PCM |
| P0157 | DTC P0137 or P0157 in Engine Controls in the G/H Van Service Manual | PCM |
| P0158 | DTC P0138 or P0158 in Engine Controls in the G/H Van Service Manual | PCM |
| P0160 | DTC P0140 or P0160 in Engine Controls in the G/H Van Service Manual | PCM |
| P0161 | DTC P0135, P0141, P0155, or P0161 in Engine Controls in the G/H Van Service Manual | PCM |
| P0171 | DTC P0171 or P0174 DTC P0171 or P0174 in Engine Controls in the G/H Van Service Manual | PCM |
| P0172 | DTC P0172 or P0175 DTC P0172 or P0175 in Engine Controls in the G/H Van Service Manual | PCM |
| P0174 | DTC P0171 or P0174 DTC P0171 or P0174 in Engine Controls in the G/H Van Service Manual | PCM |
| P0175 | DTC P0172 or P0175 DTC P0172 or P0175 in Engine Controls in the G/H Van Service Manual | PCM |
| P0182 | DTC P0182 | PCM 1 |
| P0183 | DTC P0183 | PCM 1 |
| P0186 | DTC P0186 | PCM 1 |
| P0187 | DTC P0187 | PCM 1 |
| P0188 | DTC P0188 | PCM 1 |
| P0191 | DTC P0191 (w/o JL4) | PCM 1 |
| P0192 | DTC P0192 (w/o JL4) | PCM 1 |
| P0193 | DTC P0193 (w/o JL4) | PCM 1 |
| P0200 | DTC P0200 | PCM |
| P0218 | DTC P0218 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0230 | DTC P0230 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0300 | DTC P0300 | PCM |
| P0315 | DTC P0315 in Engine Controls in the G/H Van Service Manual | PCM |
| P0325 | DTC P0325 in Engine Controls in the G/H Van Service Manual | PCM |
| P0327 | DTC P0327 or P0332 in Engine Controls in the G/H Van Service Manual | PCM |
| P0332 | DTC P0327 or P0332 in Engine Controls in the G/H Van Service Manual | PCM |
| P0335 | DTC P0335 in Engine Controls in the G/H Van Service Manual | PCM |
| P0336 | DTC P0336 in Engine Controls in the G/H Van Service Manual | PCM |
| P0341 | DTC P0341 in Engine Controls in the G/H Van Service Manual | PCM |
| P0342 | DTC P0342 in Engine Controls in the G/H Van Service Manual | PCM |
| P0343 | DTC P0343 in Engine Controls in the G/H Van Service Manual | PCM |
| P0351-P0358 | DTC P0351-P0358 in Engine Controls in the G/H Van Service Manual | PCM |
| P0420 | DTC P0420 or P0430 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0430 | DTC P0420 or P0430 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0442 | DTC P0442 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0443 | DTC P0443 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0446 | DTC P0446 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0449 | DTC P0449 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0452 | DTC P0452 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0453 | DTC P0453 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0455 | DTC P0455 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0461 | DTC P0461 in Instrument Panel, Gauges, and Console in the G/H Van Service Manual | PCM 2 , IPC |
| P0462 | DTC P0462 in Instrument Panel, Gauges, and Console in the G/H Van Service Manual | PCM 2 , IPC |
| P0463 | DTC P0463 in Instrument Panel, Gauges, and Console in the G/H Van Service Manual | PCM 2 , IPC |
| P0496 | DTC P0496 in Engine Controls in the G/H Van Service Manual | PCM 2 |
| P0502 | DTC P0502 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0503 | DTC P0503 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0506 | DTC P0506 (Non-TAC) DTC P0506 (TAC) in Engine Controls in the G/H Van Service Manual | PCM |
| P0507 | DTC P0507 (Non-TAC) DTC P0507 (TAC) in Engine Controls in the G/H Van Service Manual | PCM |
| P0522 | DTC P0522 in Instrument, Panel, Gauges, and Console in the G/H Van Service Manual | IPC |
| P0523 | DTC P0523 in Instrument, Panel, Gauges, and Console in the G/H Van Service Manual | IPC |
| P0562 | DTC P0562 in Engine Electrical in the G/H Van Service Manual | PCM |
| P0563 | DTC P0563 in Engine Electrical in the G/H Van Service Manual | PCM |
| P0601-P0607 | DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls in the G/H Van Service Manual | PCM |
| P0608 | DTC P0608 (With Throttle Actuator Control) DTC P0608 (Without Throttle Actuator Control) in Cruise Control in the G/H Van Service Manual | PCM, IPC |
| P0611 | DTC P0611 | PCM 1 |
| P0641 | DTC P0641 in Engine Controls in the G/H Van Service Manual | PCM |
| P0650 | DTC P0650 in Engine Controls in the G/H Van Service Manual | PCM |
| P0651 | DTC P0651 in Engine Controls in the G/H Van Service Manual | PCM |
| P0706 | DTC P0706 in Auto Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0711 | DTC P0711 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0712 | DTC P0712 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0713 | DTC P0713 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0716 | DTC P0716 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0717 | DTC P0717 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0719 | DTC P0719 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0724 | DTC P0724 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0730 | DTC P0730 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0741 | DTC P0741 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0742 | DTC P0742 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0748 | DTC P0748 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0751 | DTC P0751 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0752 | DTC P0752 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0753 | DTC P0753 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0756 | DTC P0756 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0757 | DTC P0757 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0758 | DTC P0758 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P0894 | DTC P0894 in Automatic Transmission 4L80E in the G/H Van Service Manual | PCM |
| P1020 | DTC P1020 | PCM 1 |
| P1106 | DTC P1106 in Engine Controls in the G/H Van Service Manual | PCM |
| P1107 | DTC P1107 in Engine Controls in the G/H Van Service Manual | PCM |
| P1111 | DTC P1111 in Engine Controls in the G/H Van Service Manual | PCM |
| P1112 | DTC P1112 in Engine Controls in the G/H Van Service Manual | PCM |
| P1114 | DTC P1114 in Engine Controls in the G/H Van Service Manual | PCM |
| P1115 | DTC P1115 in Engine Controls in the G/H Van Service Manual | PCM |
| P1121 | DTC P1121 in Engine Controls in the G/H Van Service Manual | PCM |
| P1122 | DTC P1122 in Engine Controls in the G/H Van Service Manual | PCM |
| P1133 | DTC P1133 or P1153 in Engine Controls in the G/H Van Service Manual | PCM |
| P1134 | DTC P1134 or P1154 in Engine Controls in the G/H Van Service Manual | PCM |
| P1153 | DTC P1133 or P1153 in Engine Controls in the G/H Van Service Manual | PCM |
| P1154 | DTC P1134 or P1154 in Engine Controls in the G/H Van Service Manual | PCM |
| P1204 | DTC P1204 (KL8) | PCM 1 |
| P1207 | DTC P1207 | PCM 1 |
| P1208 | DTC P1208 | PCM 1 |
| P1209 | DTC P1209 | PCM 1 |
| P1258 | DTC P1258 in Engine Cooling in the G/H Van Service Manual | PCM |
| P1380 | DTC P1380 in Engine Controls in the G/H Van Service Manual | PCM |
| P1381 | DTC P1381 in Engine Controls in the G/H Van Service Manual | PCM |
| P1431 | DTC P1431 | PCM 1 |
| P1432 | DTC P1432 | PCM 1 |
| P1433 | DTC P1433 | PCM 1 |
| P1626 | DTC P1626 in Theft Deterrent in the G/H Van Service Manual | PCM |
| P1631 | DTC P1631 in Theft Deterrent in the G/H Van Service Manual | PCM |
| P1637 | DTC P1637 in Engine Electrical in the G/H Van Service Manual | PCM |
| P1683 | DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls in the G/H Van Service Manual | PCM |
| P1810 | DTC P1810 in Automatic Transmission-4L80-E in the G/H Van Service Manual | PCM |
| P2146 | DTC P2146 (w/o JL4) | PCM 1 |
| P2665 | DTC P2665 | PCM 1 |
| P2668 | DTC P2668 | PCM 1 |
| U0306 | Diagnostic System Check - Alternative Fuels (Engine Controls) | PCM |
| UXXXX | Diagnostic Trouble Code (DTC) List in Data Link Communications in the G/H Van Service Manual | PCM, BCM, IPC, VTD, EBCM |
| All DTCs operate on both fuel systems unless otherwise noted. 1 Tests only during CNG operation on KL6 vehicles. 2 Tests only during gasoline operation. These DTCs are disabled on KL8 vehicles. | ||
Diagnostic Trouble Code (DTC) List