6T30/6T40/6T45 - 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 (w/body and TCM) valve assembly. This fault is handled inside the control solenoid (w/body and TCM) valve assembly and no external circuits are involved.

Conditions for Running the DTC

Ignition voltage is between 8.0 and 18.0 volts.

Conditions for Setting the DTC

P0601

The read only memory (ROM) test has failed 5 or more 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 failed 5 or more times.

P062F

The TCM has detected a non-volatile memory error during power-down.

Action Taken When the DTC Sets

P0601, P0603, P0604, and P062F
* DTCs P0601, P0603, P0604, and P062F are Type A DTCs.
* The 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.

P0602
* DTC P0602 is a type C DTC.
* The 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 defaults the transmission to 5th gear and reverse.

Conditions for Clearing the DTC

* DTCs P0601, P0603, P0604, and P062F are Type A DTCs.
* DTC P0602 is a type C DTC.

Reference Information
Description and Operation

Refer to Electronic Component Description Electronic Component Description for control solenoid (w/body and TCM) valve assembly information.
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 Tech 2 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 Tech 2 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 transmission control module (TCM). Refer to Control Solenoid Valve and Transmission Control Module Assembly Programming and Setup (6T40/45) 6T40/45 - Automatic Transmission. If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement 6T30/6T40/6T45 - Automatic Transmission.

3. Observe the DTC information with a scan tool. DTCs P0601, P0603, P0604, and P062F should not set.

• If a DTC P0601, P0603, P0604 or P062F are set, replace the control solenoid (w/body and TCM) 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

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Refer to Control Module References Programming and Relearning for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
* Perform the Service Fast Learn Adapts 6T30/6T40/6T45 - Automatic Transmission following all transmission related repairs.