P07A3
DTC P07A3
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC P07A3
- Transmission Clutch 1 Stuck On
Typical Scan Tool Data
Circuit/System Description
The hybrid powertrain control module (HPCM) monitors the Clutch Slip parameters for each Hybrid Trans. Mode Commanded state. This DTC detects no clutch slip when the variable low and 1-2 reverse clutch is commanded OFF, indicating a stuck or welded clutch condition.
Conditions for Running the DTC
* Variable low and 1-2 reverse clutch is the primary off-going clutch.
* The variable low and 1-2 reverse clutch is commanded OFF for 3 seconds and the HPCM detects the clutch 1 slip speed is less than 30 RPM for 4.5 seconds, when commanded OFF.
Conditions for Setting the DTC
The variable low and 1-2 reverse clutch is commanded OFF for 3 seconds and the HPCM detects the clutch 1 slip speed is less than 30 RPM for 4.5 seconds, when commanded OFF.
Action Taken When the DTC Sets
P07A3 is a Type B DTC.
Conditions for Clearing the DTC
P07A3 is a Type B 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. If there are any other transmission DTCs set, diagnose those first.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information.
Circuit/System Verification
1. Clear the DTC.
2. Perform the Transmission Fluid Check (Transmission Fluid Check) to verify correct fluid level and condition. The transmission fluid level should be within the crosshatch band and the transmission fluid should be red or dark brown.
• If the transmission fluid is low or discolored, refer to Transmission Fluid Replacement (Removal and Replacement).
3. Engine idling at operating temperature. Attempt to clean or free up a potential sticking valve with the scan tool Service Cleaning Procedure. Refer to Control Solenoid Valve and Transmission Control Module Assembly Cleaning (Control Solenoid Valve and Transmission Control Module Assembly Cleaning) for further instructions.
4. Operate the vehicle from 1st through 4th gear while observing the Clutch 1 Slip Speed parameter. Stop the vehicle and turn the ignition OFF for 30 seconds. Perform this action 2 times. The Clutch 1 Slip Speed parameter should display greater than 0 RPM when the Clutch 1 Status parameter displays Released.
• If any other transmission DTCs are set, diagnose those first.
• If the DTC P07A3 resets, go to Component Testing.
Component Testing
1. Perform the Line Pressure Check (Line Pressure Check).
2. 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 a concern is found, replace the control solenoid (w/body and TCM) valve assembly.
3. Inspect the trans fluid pump ball check valve for possible sticking or damage.
• If you found a concern with this check ball, repair the concern.
4. Inspect the valve body assembly for sticking or damaged valves.
• If you found a stuck or damaged valve, repair or replace the valve or valve body.
5. Inspect the variable low and 1-2 reverse clutch for a stuck On or damaged condition.
• If you found a variable low and 1-2 reverse clutch concern, repair or replace the variable low and 1-2 reverse clutch assembly as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Control Module References (Programming and Relearning) for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming
* Variable Low and 1-2 Reverse Clutch Piston Removal (Overhaul) and Variable Low and 1-2 Reverse Clutch Piston Installation (Overhaul) for variable low and 1-2 reverse clutch repair or replacement
* Control Valve Lower Body and Upper Body Replacement (2MT70 - Automatic Transmission) for lower valve body assembly replacement
* Perform the valve body inspection procedure, refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection). If the inspection procedure indicates to replace the valve body, refer to Control Valve Lower Body and Upper Body Replacement (2MT70 - Automatic Transmission).
* Transmission Replacement (Removal and Replacement) for transmission removal