U0203Lost Communication With Door Control Module E
- Generic OBD-II code · Network
- How the car detects it
- U0203 reports a missing door control module E. For the 2011 Saab 9-5, GM fills this slot with the left rear door switch panel, so on these GM platforms E is the electronics behind the rear left window and lock switches rather than a fifth door. GM preliminary information PIT5606J (GMC Acadia and Cadillac XT5, 2017–2021) lists U0203 among a crowd of U-codes that show up together when the instrument panel harness rubs through at the steering column next to the intermediate shaft, or when water reaches the body control module through a blocked HVAC drain or enters connectors such as X200, X201 and X500. Door locks cycling while driving or seats moving by themselves belong to that picture. The code alone sets no MIL.
- What you may notice
- Left rear window or lock switches without function
- Door locks cycle on their own while driving
- Many other lost-communication codes stored at once
- Likely causes
- LikelyInstrument panel harness chafed at the steering column (GM Acadia/XT5)
- LikelyWater at the body control module or in body connectors
- PossibleBroken wires between rear door and body
- RareRear door switch panel module faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.