Diagnostic Instructions
DTC Descriptor
DTC P0751: Shift Solenoid (SS) 1 Valve Performance - Stuck Off
Circuit/System Description
The shift solenoid (SS) 1 is part of the control solenoid (w/body and transmission control module (TCM) valve assembly and is not serviced separately. The control solenoid (w/body and TCM) valve assembly supplies 12 volts to
SS 1 on the high side driver 1 circuit. The control solenoid (w/body and TCM) valve assembly controls the normally closed SS 1 on the SS 1 control circuit. The SS 1 controls the transmission fluid to the 1-3 clutch regulator
valve assembly.
In the OFF position, SS 1 controls the transmission fluid to the following components:
| • | EVT 1 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid low, 1-2 clutch. |
| • | Gear 1, oil is supplied to the hybrid low, 1-2 clutch and the 1-3 clutch. |
| • | Gear 2, oil is supplied to the hybrid low, 1-2 clutch and the hybrid direct, 2-3-4 clutch. |
In the ON position, SS 1 controls the transmission fluid to the following components:
| • | EVT 2 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid direct, 2-3-4 clutch. |
| • | Gear 3, oil is supplied to the hybrid direct, 2-3-4 clutch and the 1-3 clutch. |
| • | Gear 4, oil is supplied to the hybrid direct, 2-3-4 clutch and the 4th clutch. |
Conditions for Running the DTC
EVT 2, gear 3, or gear 4 is commanded.
Conditions for Setting the DTC
The TCM detects shift solenoid valve 1 is OFF when commanded ON.
Action Taken When the DTC Sets
P0751 is a Type A DTC.
Conditions for Clearing the DTC
P0751 is a Type A DTC.
Diagnostic Aids
When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information.
Special Tools
DT-47825 Control Solenoid Test Plate Kit
Circuit/System Verification
- Verify that DTCs P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 are not set.
- Perform the
Transmission Fluid Check.
- Operate the vehicle in drive from a complete stop to obtain 56 km/h (35 mph), stop the vehicle, turn the ignition Off for at least 30 seconds. Perform this 2 times.
| ⇒ | If the DTC resets, refer to Circuit/System Testing. |
Circuit/System Testing
- Perform the
Line Pressure Check.
| ⇒ | If the pressure is out of specification correct that concern first. |
- Perform the
Control Solenoid Valve and Transmission Control Module Assembly Inspection.
| ⇒ | If a concern is found, repair or replace the control solenoid (w/body and TCM) valve assembly. |
- Perform the
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 control solenoid (w/body and TCM) valve assembly. |
| ⇒ | If the control solenoid (w/body and TCM) valve assembly tests normal, inspect the valve body and hydraulic circuits for a leak or a stuck valve. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
