U050BInvalid Data Received From Moveable Roof Control Module B
- Generic OBD-II code · Network
- How the car detects it
- A second moveable roof module only makes sense where the roof has more than one powered element, for instance a sliding front glass panel plus a separately driven rear panel or sunshade, or a large panoramic roof split into sections. U050B records that data from this second unit reached the network but was unusable. GM's Saab 9-5 code list knows only one moveable roof module (U0207), and no manufacturer publishes a case for the B module, so the code is uncommon. Its lost-communication partner is U020A. Because each panel keeps its own end positions and pinch protection, faulty data from B usually affects only that panel: it may stay closed, stop part-way or need re-initialising.
- What you may notice
- Rear roof panel or shade not moving while the front one works
- Panel stopping part-way
- Likely causes
- PossibleSecond roof drive lost its end-position learning
- PossibleMoveable roof control module B faulty, often after water entry
- RareConnector or lead to the rear roof drive damaged
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.