DTC P0773: SHIFT SOLENOID "E" ELECTRICAL Chevrolet Silverado 2500

Note. For circuit identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

Circuit Description

Shift solenoid "E" is a normally closed solenoid that provides the necessary logic to distribute fluid to the correct clutches. The shift solenoid provides either full pressure or exhaust to the head of shift valve "E". Since the valve state, stroked or unstroked, is critical to providing the correct transmission gear range, the shift valve has a pressure switch (located in the pressure switch manifold) which provides feedback to the computer as to the valve's position.

This is a type "A" DTC.

Conditions For Running The DTC

DTC will run under the following conditions

1. The components are powered, and ignition voltage is greater than 9 volts and less than 18 volts.
2. Engine speed is greater than 200 RPM and less than 7500 RPM for 5 seconds.

Conditions For Setting The DTC

DTC will set under one of the following conditions

1. An open circuit for 50 milliseconds.
2. A short to ground for 50 milliseconds.
3. A short to power in solenoid "E" circuit for 50 milliseconds.

Action Taken When The DTC Sets

TCM performs the following actions if DTC is set

1. When in a forward gear range, the transmission will shift to another forward gear range while diagnostic response is active.
2. If the gearshift lever is moved to Neutral, then the transmission will shift to Neutral.
3. If the gearshift lever is moved to Reverse, then the transmission will shift to Neutral or Reverse.
4. If the gearshift lever is returned to a forward gear range and the transmission is compromised by overspeeding or direction change, then the transmission will lock in Neutral.
5. DTC will be stored in the TCM history.
6. The TCM freezes shift adapts.
7. Illuminates the MIL when active.
8. TCM inhibits TCC engagement.

Conditions For Clearing The DTC

DTC will clear under the following conditions

1. A scan tool can clear the DTC from the TCM history.
2. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

Test Description

The numbers listed below refer to step numbers in the diagnostic procedure

1. 2 This step tests ignition voltage.
2. 3 This step tests the command signal from the TCM, and tests the wiring harness for opens or shorts.
3. 4 This step tests the resistance value of the external harness and solenoid.
4. 5 This step tests the command signal from the TCM.
5. 6 This step tests the resistance value of the solenoid, and tests the internal wiring harness for opens or shorts.
6. 8 This step tests the resistance value of the solenoid.