After On-Board Diagnostics

NOTE: The vehicle wiring harness, powertrain control module and non-transmission sensors can affect transmission operations. Repair these concerns first.

After the On-Board Diagnostics procedures are completed, repair all Des.

Always repair all non-transmission-related codes first, then repair any transmission-related codes. Refer to the following Diagnostic Trouble Code Chart for information on condition and symptoms. This chart will be helpful to aid in diagnosing internal transmission concerns and external non-transmission inputs. The pinpoint tests are used in diagnosing electrical concerns of the 4R100 transmission. Make sure the vehicle wiring harness and the powertrain control module are diagnosed as well. 4R100