Diagnostic Test

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 

• Using the schematics as a guide, check the ESM terminals for corrosion, damage or terminal push out. Pay particular attention to power and ground circuits. Check Service Information or Service Bulletins for possible causes that may apply. If no trouble is found, replace the ESM. Refer to SHIFTER, TRANSMISSION, REMOVAL AND INSTALLATION, 8HP50/850RE or SHIFTER, TRANSMISSION, REMOVAL AND INSTALLATION, 8HP75 .
• Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST  .

No 

• Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .