U0189Lost Communication With Digital Disc Player/Changer Module C
- Generic OBD-II code · Network
- How the car detects it
- U0189 covers the third disc player or changer on the bus, module C. Systems with more than one drive are found mostly in rear-seat entertainment or luxury setups, where a front unit and separate rear players feed different screens. The head unit or another listener stores U0189 once module C's cyclic messages stop arriving; GM describes this mechanism for all U0100-U02FF codes, with voltage required to be between 9 and 16 V. No manufacturer documents U0189 publicly, and GM's published list contains no disc player codes. U0187 and U0188 name modules A and B, U0190 module D. Check whether the vehicle really has a third drive before chasing wiring. Only that source fails; no MIL, no effect on driving.
- What you may notice
- Rear or third disc source unavailable
- Rear screen shows no disc content
- Code stored in the head unit
- Likely causes
- LikelyDisc unit C fuse blown or ground loose
- PossibleConnector or bus wiring to the rear player damaged
- PossibleVehicle coded for a third drive that is not fitted
- RareDisc player/changer C faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.