Diagnostic Test

CHECK PARK BUTTON FOR OBSTRUCTION
1. Inspect the Knob Release button for obstructions.
  Were any obstructions present?
  
  Yes
  - Clear the obstruction.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST, 8HP50/850RE or TRANSMISSION VERIFICATION TEST, 8HP75 .
  No
  - Go To 2
CHECK IF THE DTC IS CURRENT
1. Turn ignition ON, engine NOT running.
2. With the scan tool, clear the DTC.
3. Using the Environmental Data recorded earlier, try to duplicate the conditions in which the DTC set. It may be necessary to test drive the vehicle.
4. With the scan tool, read ESM DTCs.
  Did DTC P1C76-24 reset?
  
  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 TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST, 8HP50/850RE or TRANSMISSION VERIFICATION TEST, 8HP75 .
  No
  - Go To 3
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
4. Check for any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST, 8HP50/850RE or TRANSMISSION VERIFICATION TEST, 8HP75 .
  No
  - Test Complete.