Where to Start Diagnosis

Important: Do not clear the DTCs unless you are instructed to do so by a diagnostic procedure.

If the Engine MIL illuminates, start with the Powertrain OBD System Check in Engine Controls. If only the Service Transmission Lamp (STL) illuminates, start with the Transmission On-Board Diagnostic (OBD) System Check.

While performing a diagnostic procedure, you may need to gain access to certain components. Read the On-Vehicle Service procedures for those components.