4T45-E Automatic Transaxle

DTC P0601, P0602, P0603, P0604, or P062F

DTC Descriptor
This diagnostic procedure supports the following DTCs:
^ 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

Diagnostic Fault Information

Important:
Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description
The internal fault detection is handled inside the transmission control module (TCM). No external circuits are involved.

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, 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.

DTCs P0601, P0603, P0604, and P062F
The TCM commands a soft landing to 2nd gear.

DTC P0602
The TCM commands an immediate landing to 2nd gear.

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.

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, replace the TCM.

Repair Instructions

Important:
Always perform the Diagnostic Repair Verification after completing the repair. Verification Tests

Control Module References for TCM replacement, setup, and programming.