Carry Out on-Board Diagnostics (KOEO, KOER)

Carry out on-board diagnostic procedures key on engine off (KOEO) and key on engine running (KOER).

After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using the scan tool.
^ Record all diagnostic trouble codes (DTCs).
^ Repair all non-transmission codes first.
^ Repair all transmission codes second.
^ Erase all continuous codes and attempt to repeat them.
^ Repair all continuous codes.
^ If only pass codes are obtained, refer to Diagnosis By Symptom for further information and diagnosis. 4R70W/4R75W - Automatic Transmission

Follow the diagnostic sequence to diagnose and repair the concern the first time.