Network, generic

U048A Invalid Data Received From Digital Disc Player/Changer Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U048A stands for a third disc player or changer, module C. It is set when that unit's frames reach the receiver but fail its checks; silence would be U0189. Three networked drives in one vehicle are rare. Luxury cars with a DVD changer in addition to the head unit come closest: Audi's update 72K1 for the 2019 A8 replaced the changer mounting because its trim cover could come loose. No manufacturer assigns the letter C publicly or documents U048A, so the code works mainly as a reserve slot in the J2012 list. If it does appear, first check whether the vehicle actually has such a unit or carries a coding error after a retrofit, then power, ground and the bus link to the drive. No MIL; driving is unaffected.

Likely causes

Wrong vehicle coding after a retrofit or removal of a disc unit
Supply, ground or bus connection fault at the third drive
Internal fault of the disc unit

Symptoms

  • Disc playback from that unit unavailable
  • Code present without any noticeable fault on cars without such a unit

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–400
Time0.3–1.5 h

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

Parts involved

disc changer module c

Related codes

U0189U0489U0488U0491

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