P0751

DTC P0751

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P0751
- Shift Solenoid (SS) 1 Valve Performance - Stuck Off

Circuit/System Description

The shift solenoid 1 and transmission control module are part of the control solenoid valve assembly and are not serviced separately. The transmission control module supplies 12 V to shift solenoid 1 on the high side driver 1 circuit. The transmission control module controls the normally closed shift solenoid 1 on the shift solenoid 1 control circuit. The shift solenoid 1 controls the transmission fluid to the shift solenoid valve (523).

Conditions for Running the DTC

* Any transmission shift or engine On command.
* Line pressure command is greater than 325 kpa.

Conditions for Setting the DTC

The transmission control module detects shift solenoid valve 1 is OFF when commanded ON.

Action Taken When the DTC Sets

* P0751 is a Type A DTC.
* The driver information center may display ENGINE NOT AVAILABLE SERVICE SOON.
* The internal combustion engine may not start.

Conditions for Clearing the DTC

P0751 is a Type A DTC.

Reference Information
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

1. Verify that P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 is not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Vehicle ON, in Park, open the hood. The internal combustion engine should start and transmission fluid pressure switch 1 on the scan tool should transition from Low to High.

• If the engine does not start and the transmission fluid pressure switch 1 parameter does transition from Low to High, inspect the control valve body shift solenoid valve (523) for a stuck off condition. Refer to Control Valve Body Diagnostic Inspection Control Valve Body Diagnostic Inspection.
• If the engine starts and the transmission fluid pressure switch 1 parameter does not transition from Low to High, inspect the transmission fluid pressure switch 1 for a stuck Low condition. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.

3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.

• If the shift solenoid 1 is found to be leaking or stuck OFF, replace the Q8 control solenoid valve assembly.

• If the control solenoid valve assembly tests normal, inspect the shift solenoid valve (523) and hydraulic circuits for a leak or a stuck valve. Refer to Control Valve Body Diagnostic Inspection Control Valve Body Diagnostic Inspection.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Control Valve Body Replacement Control Valve Body Replacement for control valve body replacement.
* Control Valve Body Diagnostic Inspection Control Valve Body Diagnostic Inspection
* Control Module References Programming and Relearning for Control Solenoid Valve Assembly and Transmission Control Module Assembly replacement, programming, and setup.
* Perform the Reset Transmission Adapts Programming and Relearning following all transmission related repairs.