5L40-E/5L50-E - Automatic Transmission

DTC P0601, P0602, P0603, P0604, or P062F

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) provides an overview of each diagnostic category.



DTC Descriptor
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 transmission control module (TCM). No external circuits are involved. These DTCs are Type A DTCs.


Conditions for Running the DTC

The TCM runs the program to detect an internal fault 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 malfunction.


Action Taken When the DTC Sets

* DTCs P0601, P0602, P0603, P0604 are Type A DTCs.
* The TCM commands second gear.
* The TCM commands maximum line pressure.
* The TCM commands HSD1 and HSD2 OFF.
* The TCM forces the TCC OFF.
* The TCM inhibits the TCC solenoid.
* The TCM freezes transmission adaptive functions.

P062F

* DTC P062F is a Type A DTC.
* The TCM commands HSD1 OFF.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.



Conditions for Clearing the DTC

DTCs 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

Component Connector End Views (Connector Views)
Description and Operation

Transmission General Description (Transmission General Description)
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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Transmission Control Module Scan Tool Information (Scan Tool Testing and Procedures)


Circuit/System Verification

Verify that DTC P0602 is not set.

If DTC P0602 is set, program the TCM.


If DTC P0602 is not set, replace the TCM



Repair Instructions

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


Control Module References (Programming and Relearning) for TCM replacement, setup, and programming.