U0187Lost Communication With Digital Disc Player/Changer Module A
- Generic OBD-II code · Network
- How the car detects it
- U0187 opens the J2012 series for networked disc players and changers: module A is the main CD or DVD drive, while U0188 to U0190 cover B to D. In many older cars the changer sat apart from the head unit, in the glovebox, under a seat or in the trunk, and reported to it over a data line. U0187 has no public manufacturer documentation; GM lists no disc drives at all and the NHTSA bulletin index has no match. The radio records the code when the drive's periodic message stays away, following the logic GM gives for all loss-of-communication codes. Discs can then not be played or ejected, the rest of the sound system keeps working, and there is no MIL. A removed or never-fitted drive can also leave this entry behind.
- What you may notice
- CD or DVD source missing or not selectable
- Disc cannot be loaded or ejected
- Other audio sources work normally
- Likely causes
- LikelyDisc unit A without power or ground
- PossibleData line or connector to the changer (glovebox, seat, trunk) damaged
- PossibleDrive removed or head unit coded for a drive not fitted
- RareDisc player/changer A 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.