Chassis, generic

C0546 VIN Not Programmed or Incompatible

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Replacement chassis module not programmed with the vehicle VIN
Second-hand module carrying a foreign VIN
Software level not matching the vehicle configuration

Symptoms

  • Warning lamp of the affected chassis system on
  • Function of the replaced module missing or limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–400
Time0.5–1.5 h

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

Parts involved

chassis module

Related codes

C0545P0630P0631

References: patents.google.com, patents.google.com.