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
- Go To the appropriate service information
No
- Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
VISUALLY INSPECT THE BRAKE TRANSMISSION SHIFTER INTERLOCK (BTSI) SOLENOID CIRCUITS
1. Turn the ignition Off.
2. Remove any necessary console parts for access to the Shifter Assembly. Refer to CONSOLE, FLOOR, REMOVAL AND INSTALLATION and/or CONSOLE, FLOOR, END CAP, REMOVAL AND INSTALLATION .
3. Visually inspect the wiring to the BTSI solenoid.
4. Make sure the wiring is securely connected at the solenoid.
  Were problems found?
  
  Yes
  - Repair the circuit(s).
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST, 8HP50/850RE or TRANSMISSION VERIFICATION TEST, 8HP75 .
  No
  - Replace the ESM in accordance with the Service information. 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 .