LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2012 >> Compass Limited, FWD, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Transmission Control Module (TCM) - Electrical Diagnostics >> DTC Troubleshooting >> P0602-Control Module PROGRAMING Error/Not Programmed >> Diagnostic Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Test

  1. CHECK FOR CAN BUS DTCS 
    1. With the scan tool, check for CAN BUS DTCs.

      Are there any CAN BUS DTCs present?

      Yes 

      No 

      • Go To  2.
  2. CHECK IF CONTROLLER WAS REPLACED 

    Has the Transmission Control Module been recently replaced?

    Yes 

    • Go To  3.

    No 

    • Go To  5.
  3. CHECK IF CONTROLLER WAS PROGRAMED 

    Was the Transmission Control Module flashed?

    Yes 

    • Go To  4.

    No 

    • Flash the control module with the proper part number for the vehicle.
    • Refer to STANDARD PROCEDURE  and perform the CVT VERIFICATION TEST.
  4. CHECK FOR OTHER DTCS 
    1. With the scan tool, check Transmission DTCs.

      Are the DTCs P0602 and U140F Active and P161B and P1729 Stored?

      Yes 

      • Check the Controller part number coincides with the vehicle setup such as engine size or with or without All wheel Drive (AWD). This is an indication of an improper vehicle configuration. Verify all configurations to the Vehicle Identification Number (VIN) and reprogram as necessary.
      • Refer to STANDARD PROCEDURE  and perform the CVT VERIFICATION TEST.

      No 

      • Go To  5.
  5. CHECK THE FCM FOR PROPER PROGRAMING OF TIRE SIZE 
    1. With the scan tool, check the TIPM/FCM for proper tire size programing.

      Is the tire size properly programed in the TIPM/FCM?

      Yes 

      • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM in accordance with the Service Information.
      • Refer to STANDARD PROCEDURE  and perform the CVT VERIFICATION TEST.

      No 

      • Program the TIPM/FCM with the proper tire size.
      • Refer to STANDARD PROCEDURE  and perform the CVT VERIFICATION TEST.