Network, generic

U0489 Invalid Data Received From Digital Disc Player/Changer Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0489 refers to disc player/changer module B, a second drive in the same network, such as a changer added to a radio that already plays CDs or a DVD unit for the rear seats. The receiver still hears it but rejects the content, whereas loss of contact is U0188; drive A has U0488. Two-drive layouts did exist at GM: the 2004-2009 Cadillac XLR paired its navigation radio with a separate CD changer, and GM PIC4858A notes that a replacement changer installed with its shipping pin still in place refuses discs and shows a CD error. No maker states which drive counts as B, and none documents U0489. Discs in that unit cannot be played, while radio and other sources work; no MIL.

Likely causes

Replacement changer fitted without removing the transport lock
Mechanical or internal fault in the changer
Vehicle coded for a second drive that is missing or of another type

Symptoms

  • Second disc drive does not accept or play discs
  • Disc error message on the display

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–500
Time0.3–1.5 h

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

Parts involved

disc changer module b

Related codes

U0188U0488U048AU0491

References: static.nhtsa.gov, en.wikipedia.org.