6L45/6L50/6L80/6L90 - 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

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 carried out inside the Transmission Control Module and no external circuits are involved.

Conditions for Running the DTC

* DTC P0601, P0603, P0604, or P062F is not set.

* Ignition voltage is between 8.6-32 V.

Conditions for Setting the DTC

P0601

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

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 non-volatile memory is incorrect during power-down.

Action Taken When the DTC Sets

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

* The TCM shifts to a default gear, shuts down, and turns OFF.

Conditions for Clearing the DTC

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

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics 6L45/6L50/6L80/6L90 - Automatic Transmission

Connector End View Reference

* Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

* Inline Harness Connector End Views X100

Description and Operation

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

Special Tools

DT-47825-10 - Jumper Harness

For equivalent regional tools, refer to Special Tools 6L45/6L50/6L80/6L90 - Automatic Transmission.

Circuit/System Verification

1. Ignition OFF for one minute. Ignition ON.

2. Verify with a scan tool that 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

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.

4. Verify the DTC does not set.

• If the DTC sets
Replace the Q8 Control Solenoid Valve Assembly

• If the DTC does not set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.

* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.