TCM
DTC P0601-P0604 or P062FDiagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
Note
DTCs P0601, P0602, 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 P0602
Control Module Not Programmed
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 volts and 18.0 volts.
Conditions for Setting the DTC
P0601
The read only memory (ROM) test has failed 5 or greater times.
P0602
The TCM has not been programmed and is unable to detect the start program.
P0603
The TCM has detected a memory checksum error.
P0604
The TCM has detected a random access memory (RAM) test error 5 or greater times.
P062F
The TCM has detected a non-volatile memory error during power-down.
Action Taken When the DTC Sets
P0601, P0602, P0603, P0604, or P062F
- DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.
- The TCM limits the transmission to Reverse and 5th gear operation.
- The TCM commands maximum line pressure.
- The TCM forces the torque converter clutch (TCC) OFF.
- The TCM freezes transmission adaptive functions.
- The TCM commands the high side driver OFF.
- The TCM inhibits Tap Up/Down function.
- The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DTC
DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.
Reference Information
Description and Operation
Electronic Component Description for control solenoid valve assembly
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Warning
Before programming a control module, the following must be observed, or control module damage may occur:
- The TIS terminal, MDI, and/or scan tool must have the latest software.
- The vehicle battery must be fully charged. The battery voltage should be between 12-14 volts.
- The TIS terminal, MDI, and/or scan tool connections must be secure.
- A battery charger must NOT be connected to the battery when programming a control module.
Ignition OFF for 1 minute.
2. Ignition ON, with a scan tool, verify that DTC P0602 is not set.
3. If the DTC is set, program K71 TCM. Refer to Programming and setup of control solenoid valve and transmission control module (6T70/6T75). If the DTC resets, replace the Q8 control solenoid valve assembly.
4. Check the DTC information with a diagnostic tool. DTCs P0601, P0603, P0604, and P062F should not set.
5. If DTC P0601, P0603, P0604, or P062F sets, replace the Q8 control solenoid valve assembly.
6. After performing the above steps, verify that the DTC does not return by operating the vehicle within the conditions for running fault codes (DTC). You may also operate the vehicle within the conditions you have seen from the freeze frame/failure records. If the vehicle passes the Circuit/System Verification procedure, refer to Testing for Intermittent Conditions and Poor Connections.
Repair Instructions
Note
Perform the Transmission Adaptive Values Learn any time a transmission related component is serviced. Programming and Relearning
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid valve assembly replacement, setup, and programming