Network, generic

U0187 Lost Communication With Digital Disc Player/Changer Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Disc unit A without power or ground
Data line or connector to the changer (glovebox, seat, trunk) damaged
Drive removed or head unit coded for a drive not fitted
Disc player/changer A faulty

Symptoms

  • CD or DVD source missing or not selectable
  • Disc cannot be loaded or ejected
  • Other audio sources work normally

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–400
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

disc player modulecan bus wiring

Related codes

U0188U0189U0190U0488U0184

References: saabwisonline.com, en.wikipedia.org.