6T70/6T75 - Automatic Transmission
DTC P0601, P0603, P0604, or P062F
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
Note: DTCs P0601, P0603, P0604 or P062F could set in other control modules. Verify the DTCs are set in the transmission control module (TCM).
DTC P0601
- Control Module Read Only Memory Performance
DTC P0603
- Control Module Long Term Memory Reset
DTC P0604
- Control Module Random Access Memory Performance
DTC P062F
- Control Module Long Term Memory Performance
Circuit/System Description
This is an internal fault detection of the control solenoid valve assembly. This fault is handled inside the control solenoid valve assembly and no external circuits are involved.
Conditions for Running the DTC
Ignition voltage is between 8.6-32 V.
Conditions for Setting the DTC
P0601
TCM has detected a read only memory (ROM) error 5 times.
P0602
TCM has not been programmed and is unable to detect the start program.
P0603
TCM has detected a non-volatile memory checksum error at TCM powerup.
P0604
TCM has detected a random access memory (RAM) test error 5 times.
P062F
TCM has detected a non-volatile memory error during power-down.
Action Taken When the DTC Sets
* DTCs P0601, P0603, P0604, and P062F are Type A DTCs.
* TCM limits the transmission to Reverse and 3rd or 5th gear operation.
* TCM commands maximum line pressure.
* TCM forces the torque converter clutch (TCC) OFF.
* TCM freezes transmission adaptive functions.
* TCM commands the high side driver OFF.
* TCM inhibits Tap Up/Down function.
* TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DTC
DTCs P0601, P0603, P0604, and P062F are Type A DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics 6T70/6T75 - Automatic Transmission
Connector End View Reference
Component Connector End Views Sunshade - Left Front
Inline Harness Connector End Views X110
Description and Operation
Transmission General Description Transmission General Description
Transmission Component and System Description Transmission Component and System Description
Electronic Component Description Electronic Component Description
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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
2. Ignition ON.
3. Verify DTC P0601, P0603, P0604, or P062F is not set.
• If any of the DTCs set
Replace the Q8 Control Solenoid Valve Assembly.
• If none of the DTCs set
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTCs do not set.
• If a DTC sets
Replace the Q8 Control Solenoid Valve Assembly.
• If no DTCs set
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Perform the Reset Transmission Adapts Reset Transmission Adapts any time a transmission component is serviced.
Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair
Control Module References Control Module References for control solenoid valve assembly replacement, setup, and programming