Circuit/System Verification

Ignition ON/Vehicle in Service Mode.
Verify no other DTCs are set.
- If other DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle and resolve all other DTCs
- Go to next step: If no other DTCs are set
Verify K71 Transmission Control Module has the most up to date software.
- If software is not current
  Perform the programming procedure for the K71 Transmission Control Module.
- Go to next step: If software is up to date
Replace the K71 Transmission Control Module
1. Verify DTC P1787 is not set.
  - If DTC P1787 is set
    Replace the K38 Chassis Control Module.
  - Go to next step: If DTC P1787 is not set
    Go to next step: All OK.
- Go to next step: If DTC P1787 is not set
All OK.