U0204Lost Communication With Door Control Module F
- Generic OBD-II code · Network
- How the car detects it
- U0204 is set when door control module F stops answering. On the 2011 Saab 9-4x, whose U-code list comes from GM, the letter F belongs to the right rear door switch panel, the mirror-image partner of U0203 on the left. Before any repair, GM preliminary information PIC5741A (2013 Cadillac ATS, 2010–2013 SRX) is worth knowing: U0204, together with a long series of other communication codes and an instrument self-test, may appear only because the scan tool plug sits loosely in a diagnostic socket with spread terminals, most often ground pins 4 and 5. Checking and replacing those terminals comes first. With a genuine dropout, the window and lock switches at the right rear stop responding. No MIL is set.
- What you may notice
- Right rear window or lock switches inoperative
- Codes appear together with an instrument self-test when the scan tool is plugged in
- Likely causes
- LikelySpread terminals in the diagnostic connector, false entries while testing (GM)
- PossibleBroken wires in the right rear door hinge harness
- PossibleLoose or corroded door connector pins
- RareRear door switch panel module faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.