4T65-E - Automatic Transaxle

DTC P0601, P0602, P0603, P0604, or P062F (5.3L)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provide 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

The internal fault detection is handled inside the TCM. No external circuits are involved.


Conditions for Running the DTC

The TCM runs the program to detect an internal condition when the engine is running. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.


Conditions for Setting the DTC

The TCM has detected an internal condition.


Action Taken When the DTC Sets

* DTC P0601, P0602, 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.


P0601, P0603, P0604, and P062F

The TCM commands a soft landing to 2nd gear.

P0602

The TCM commands an immediate landing to 2nd gear.


Conditions for Clearing the DTC

DTC P0601, P0602, P0603, P0604, and P062F are type A DTCs.


Diagnostic Aids

DTC P0602 indicates the TCM is not programmed.


Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

* Electrical Center Identification Views (Application and ID)
* Component Connector End Views (Connector Views)
* Splice Pack Connector End Views ([1][2]Branching Point)
* Inline Harness Connector End Views ([1][2]Diagrams)

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
DTC Type Reference

* Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
* Diagnostic Trouble Code (DTC) List/Type (Diagnostic Trouble Code Descriptions)



Circuit/System Verification

1. Verify that DTC P0602 is not set.

• If DTC P0602 is set, program the TCM.

2. If DTC P0602 is not set or DTC P0602 resets, replace the TCM.



Repair Instructions

* Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Control Module References (Programming and Relearning) for TCM replacement, setup, and programming