U0491Invalid Data Received From Digital Disc Player/Changer Module D
- Generic OBD-II code · Network
- How the car detects it
- U0491 belongs to a fourth networked disc player or changer, module D: frames from that drive still arrive, yet the radio or gateway rejects their content. Its lost-contact partner is U0190; drives A to C have U0488, U0489 and U048A. Separate disc drives did exist, for example the media disc player in GM's 2017 Silverado, Sierra, Suburban, Tahoe and Yukon with entertainment package, which bulletin 17-NA-378 replaced when film sound drifted out of sync with the picture. A fourth unit of this kind is practically unknown, and no manufacturer documents U0491 or publicly assigns the letter D. On a car without such a drive the code hints at coding or software rather than hardware. No MIL; at most disc playback is lost.
- What you may notice
- Discs in that drive cannot be played
- Code stored without noticeable fault on cars lacking such a drive
- Likely causes
- PossibleVehicle coding or head-unit software expecting a fourth disc drive that is absent or different
- PossibleDisc drive D hung up or internally faulty
- RarePoor supply, ground or bus link at the drive
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.