P07A7
DTC P07A7
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 P07A7
- Transmission Clutch 3 Stuck On
Typical Scan Tool Data
Circuit/System Description
The hybrid/electric vehicle (EV) powertrain control module 1 monitors the clutch slip speed for each Hybrid/EV Transmission Mode Command. When the 1-3 Reverse Clutch is commanded OFF, low clutch slip speed indicates a stuck or welded clutch condition. If the hybrid/EV powertrain control module 1 detects a stuck clutch condition, the hybrid/EV powertrain control module 1 will cycle the clutch 3 times within 30 seconds. The customer may feel 3 bumps before the DTC sets.
Conditions for Running the DTC
* 1-3 Reverse Clutch is commanded Off.
* The Calculated Trans Input Speed is greater than 360 RPM.
Conditions for Setting the DTC
The 1-3 Reverse Clutch is commanded OFF for 3 seconds and the hybrid/EV powertrain control module 1 detects the clutch 3 slip speed is less than 100 RPM for 3 seconds, when commanded OFF.
Action Taken When the DTC Sets
DTC P07A7 is a Type A DTC.
Conditions for Clearing the DTC
DTC P07A7 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. 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 Hybrid/EV Battery Pack X1
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information.
Circuit/System Verification
1. Verify that P0721, 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. Perform the Transmission Fluid Level and Condition Check Testing and Inspection to verify correct fluid level and condition.
• If the transmission fluid is low or discolored, refer to Transmission Fluid Drain and Fill Transmission Fluid Drain and Fill.
3. Operate the transmission in Single Electric Motor or Dual Electric Motors modes while observing the Clutch 3 Slip Speed parameter. The Clutch 3 Slip Speed parameter display should be greater than 100 RPM when the Clutch 3 Status parameter displays Released.
• If the DTC P07A7 is set, refer to Component Testing.
Component Testing
1. Perform the Line Pressure Check Line Pressure Check.
• If you found a concern, repair the concern.
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 Q8 control solenoid valve assembly.
3. Inspect the shift solenoid valve for stuck or damaged condition.
• If you found a concern with the shift solenoid, repair or replace the valve or valve body.
4. Inspect the 1-3 reverse clutch assembly for a stuck ON or damaged condition. Refer Control Valve Body Diagnostic Inspection Control Valve Body Diagnostic Inspection.
• If you found a 1-3 reverse clutch assembly concern, repair or replace the low and reverse clutch assembly as necessary.
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.
* 1-3-Reverse Clutch Disassemble 80. 1-3-Reverse Clutch Disassemble and 1-3-Reverse Clutch Assemble 82. 1-3-Reverse Clutch Assemble for 1-3 Reverse Clutch assembly repair or replacement.
* Transmission Replacement Transmission Replacement for transmission removal.
* 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.