2ML70 - Automatic Transmission
DTC P0796 or P0797
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 Descriptors
DTC P0796
- Pressure Control (PC) Solenoid 3 - Stuck Off
DTC P0797
- Pressure Control (PC) Solenoid 3 - Stuck On
Circuit/System Description
The clutch pressure control solenoid 3 is part of the control solenoid valve assembly and is not serviced separately. The transmission control module (TCM) supplies 12 V to the clutch pressure control solenoid 3 on the high side driver 1 circuit. The TCM controls the clutch pressure control solenoid 3 through the clutch pressure control solenoid 3 control circuit. The normally high clutch pressure control solenoid 3 controls fluid to hybrid low, 1-2 valve and the hybrid low, 1-2 clutch boost valve when commanded ON and exhausts fluid when commanded OFF.
Conditions for Running the DTC
P0796 or P0797
* The engine run time is greater than 1 second.
* Shift solenoid valve 1 is not in a transition state.
* The transmission line pressure is greater than 370 kPa (54 psi) and not fluctuating by greater than 30 kPa (4 psi).
* Propulsion is active.
P0796
The clutch pressure control solenoid 3 commanded pressure is greater than 1800 kPa (261 psi) for 4.5 seconds.
P0797
The clutch pressure control solenoid 3 commanded pressure is less than 5 kPa (1 psi) for 4.5 seconds.
Conditions for Setting the DTC
P0796 - Condition 1
The clutch pressure control solenoid 3 commanded pressure is 1800 kPa (261 psi) and the TFP switch 1 state is Low for 30 seconds.
P0766 - Condition 2
The clutch pressure control solenoid 3 commanded pressure is 1800 kPa (261 psi) and the TFP switch 1 state is Low for 0.5 seconds greater than 5 times during a key cycle.
P0797 - Condition 1
The clutch pressure control solenoid 3 commanded pressure is 5 kPa (1 psi) and the TFP switch 1 state is High for 36 seconds.
P0797 - Condition 2
The clutch pressure control solenoid 3 commanded pressure is 5 kPa (1 psi) and the TFP switch 1 state is High for 1.25 seconds greater than 5 times during a key cycle.
Action Taken When the DTC Sets
* P0796 and P0797 are Type B DTCs.
* The transmission control module commands maximum line pressure.
* The transmission control module freezes transmission adaptive functions.
Conditions for Clearing the DTC
P0796 and P0797 are Type B DTCs.
Diagnostic Aids
When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information.
Circuit/System Verification
1. Verify DTC P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 is not set.
• If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Perform the Line Pressure Check Line Pressure Check.
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.
5. Listed in the chart below are conditions for each component that could set DTC P0796 or P0797. Carefully inspect each component for that condition. Repair or replace as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
* Hybrid Low, 1-2 Clutch Piston Removal 24. Hybrid Low, 1-2 Clutch Piston Removal and Hybrid Low, 1-2 Clutch Piston Installation 31. Hybrid Low, 1-2 Clutch Piston Installation for Low and Hybrid Low, 1-2 Clutch Assembly repair or replacement.
* Control Module References Control Module References for Control Solenoid Valve Assembly replacement, programming and setup.
* Perform the Reset Transmission Adapts 2ML70 - Automatic Transmission following all transmission related repairs.