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
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
The ignition is between 8.6 volts and 18 volts.
Conditions for Setting the DTC
The control solenoid valve assembly has detected an internal malfunction.
P0601
The read only memory (ROM) test has not passed 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 random access memory (RAM) test has not passed 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, and P062F
* DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.
* The transmission control module (TCM) commands maximum line pressure.
* The TCM forces the torque converter clutch (TCC) OFF.
* The TCM inhibits TCC engagement.
* The TCM freezes transmission adaptive functions.
* The TCM commands high side driver 1 and high side driver 2 off.
* The TCM defaults the transmission to 5th gear and reverse.
Conditions for Clearing the DTC
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 (Programming and Relearning) 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 scan tool and the terminal must have the latest software.
* The vehicle battery must be fully charged. The battery voltage should be between 12-14 volts.
* The scan tool and the terminal cable 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, with a scan tool, verify that DTC P0602 is not set.
• If the DTC is set, program the TCM. Refer to Control Solenoid Valve and Transmission Control Module Assembly Programming and Setup (Control Solenoid Valve and Transmission Control Module Assembly Programming and Setup). If the DTC resets, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (6T70/6T75 - Automatic Transmission).
3. Observe the DTC information with a scan tool. DTCs P0601, P0603, P0604, and P062F should not set.
• If DTC P0601, P0603, P0604 or P062F sets, replace the control solenoid valve assembly.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Repair Instructions
Important: Perform the Service Fast Learn Adapts (6T70/6T75 - Automatic Transmission) any time a transmission related component is serviced.
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming