Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- Misalignment, debris or poor connections on the transmission output speed sensor or the transfer case vehicle speed sensor can cause this DTC to set.
- Verify that the following scan tool data can be obtained and is functioning properly while operating the vehicle within the Conditions for Running the DTC. Data that is questionable may indicate a concern.
- Transmission OSS scan tool parameter in the Transmission Control Module scan tool data list
- Transfer Case OSS scan tool parameter in the Engine Control Module scan tool data list
- Internal transmission mechanical faults can set these DTC's
- The Actions Taken for P279A may set DTC P16F3.
- DTC P279A, P279B, or P279C may set before P0502, P0503, P0721, P0722, P0723, P077C, P077D, P2160, or P2161.
- When attempting to set ECM internal DTCs, run the engine for at least 1 min, and then shut the engine off for 2 min. Following this procedure will allow for a complete ECM shutdown. Program the ECM with the latest software version and retest the DTC to see if the DTC resets.