Network, generic

U0188 Lost Communication With Digital Disc Player/Changer Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0188 means the second networked disc player or changer, module B, no longer answers. Disc changers hold several CDs or DVDs and were often mounted apart from the radio, in the dash, a console or the boot, and linked to the infotainment bus. Receiving units set a lost-communication code once the expected periodic message of a node is missing, as GM's U0100-U02FF procedure explains for all such codes. No manufacturer documents U0188 publicly; GM's U-code list has no disc player entries at all. U0187 names player A, U0189 and U0190 players C and D. Many newer cars have no disc drive, so a stray entry can also come from wrong coding. Only playback from that unit is lost; no MIL.

Likely causes

Disc unit B without power or ground
Bus or connector to the changer (often in boot or console) damaged
Unit removed or vehicle coded for a device not fitted
Disc player/changer B faulty

Symptoms

  • Disc source B missing or not selectable
  • Discs not ejected or not played
  • Code stored in the radio or 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

U0184U0187U0189U0190

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