C0546VIN Not Programmed or Incompatible
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Generic variant without a named module: a chassis control unit reports that its stored vehicle identification number is blank or does not match the car. Which unit sets it is left to the maker, so the scan tool entry shows the module concerned. The principle is documented in GM patents: each unit keeps the VIN in memory, possibly in write-once storage set at the factory; a replaced or manipulated module reveals itself because its number differs from the others, and a fresh module can adopt the vehicle VIN and its configuration on start-up. In practice the code follows a module swap without the required programming. No maker documents C0546 publicly. C0545 is the same fault tied to the brake system module; P0630 and P0631 cover engine and transmission control.
- What you may notice
- Warning lamp of the affected chassis system on
- Function of the replaced module missing or limited
- Likely causes
- LikelyReplacement chassis module not programmed with the vehicle VIN
- PossibleSecond-hand module carrying a foreign VIN
- RareSoftware level not matching the vehicle configuration
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.