Diagnostic Test

WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR RELATED TRANSMISSION CONTROL MODULE (TCM) DTCS
1. With the scan tool, read Transmission Control Module (TCM) Diagnostic Trouble Codes (DTCs) and record on the repair order.
  Are there any active clutch or speed sensor related DTCs present?
  
  Yes
  - Diagnose and repair all other clutch or speed sensor DTCs in accordance with the Service Information. Refer to 8P75PH AUTOMATIC TRANSMISSION, DIAGNOSTIC CODE INDEX .
  No
  - Go To 2
CHECK IF TRANSMISSION CONTROL MODULE (TCM) SOFTWARE UPDATE IS AVAILABLE
NOTE:
Read Service Bulletins to determine if the software update is applicable to the customer complaint.
1. With the scan tool, check if a TCM software update is available that may be related to the customer complaint.
  Is an update available?
  
  Yes
  - Perform the TCM PROGRAMMING PROCEDURE. Refer to MODULE PROGRAMMING .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Go To 3
READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Transmission in accordance with the Service Information. Refer to 8P75PH AUTOMATIC TRANSMISSION, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .