6T30/6T40/6T45/6T50 - 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

-
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 9.0 volts or greater.

Conditions for Setting the DTC

P0601

Read only memory (ROM) test has failed 5 or more 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 random access memory (RAM) test has failed 5 or more times.

P062F

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.

* TCM commands maximum line pressure.

* TCM forces the torque converter clutch (TCC) OFF.

* TCM inhibits TCC engagement.

* TCM freezes transmission adaptive functions.

* TCM commands the high side driver OFF.

* TCM defaults the transmission to 5th gear and reverse.

* Torque management is enabled.

* TCM inhibits neutral idle.

* TCM inhibits Tap Up/Down function.

* 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

Refer to Electronic Component Description Electronic Component Description for control solenoid 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 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 (TCM). Refer to Control Solenoid Valve and Transmission Control Module Assembly Programming and Setup (6T30/6T40/6T45/6T50) 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 the 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. 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.

• 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

6. 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

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

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

* Perform the Transmission Adaptive Values Learn Programming and Relearning following all transmission related repairs.