6T70/6T75 - Automatic Transmission
DTC P0601-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, P0602, P0603, P0604 or P062F could set in other control modules. Verify the DTCs are set in the transmission control module (TCM).
DTC P0601
-
Transmission Control Module (TCM) Read Only Memory (ROM)
DTC P0602
-
Transmission Control Module (TCM) Not Programmed
DTC P0603
-
Transmission Control Module (TCM) Long Term Memory Reset
DTC P0604
-
Transmission Control Module (TCM) Random Access Memory (RAM)
DTC P062F
-
Transmission Control Module (TCM) 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
Read only memory (ROM) test has failed 5 or greater times.
P0602
TCM has not been programmed and is unable to detect the start program.
P0603
TCM has detected a memory checksum error.
P0604
TCM has detected a random access memory (RAM) test error 5 or greater times.
P062F
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, P0603, P0604, and P062F are Type A DTCs.
* TCM limits the transmission to Reverse and 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 neutral idle.
* TCM inhibits Tap Up/Down function.
* TCM inhibits manual shifting of forward gears.
PO602
* DTC P0602 is a Type A DTC.
* TCM limits the transmission to Reverse and 5th gear operation.
Conditions for Clearing the DTC
PO601, P0603, P0604, or PO62F
DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.
Reference Information
Description and Operation
Electronic Component Description Electronic Component Description for control solenoid valve assembly
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
Caution:
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.
1. Ignition OFF for 1 minute.
2. Ignition ON.
3. Verify with a scan tool, that DTC P0602 is not set.
• If DTC P0602 is set
• Program the K71 transmission control module. Refer to Control Solenoid Valve and Transmission Control Module Assembly Programming and Setup Testing and Inspection. If the DTC resets, replace the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
• If DTC P0602 is not set
4. Verify with a scan tool that DTC P0601, P0603, P0604, or P062F is not set.
• If DTC P0601, P0603, P0604, or P062F is set
Replace the Q8 control solenoid valve assembly.
• If DTC P0601, P0603, P0604 or P062F is not set
5. After performing the above steps, verify that the DTC does not reset by operating 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. If the vehicle passes the Circuit/System Verification procedure, refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Repair Instructions
Note:
Perform the Reset Transmission Adapts Reset Transmission Adapts any time a transmission related component is serviced.
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for control solenoid valve assembly replacement, setup, and programming