Network, generic

U0189 Lost Communication With Digital Disc Player/Changer Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Disc unit C fuse blown or ground loose
Connector or bus wiring to the rear player damaged
Vehicle coded for a third drive that is not fitted
Disc player/changer C faulty

Symptoms

  • Rear or third disc source unavailable
  • Rear screen shows no disc content
  • Code stored in the head unit

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

U0184U0187U0188U0190

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