B0228Front Fog Lamp Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0228 appears in none of the publicly available J2012 lists, and no carmaker publishes it as a fog lamp code. General Motors does use the number, but inside climate control: bulletin PIT5383 lists B0228 among the HVAC codes of 2015 Cadillac, Chevrolet and GMC models whose K33 climate module needed new software; GM does not publish its exact wording. Read as titled, the code concerns the drive of the front fog lamps. In patent US8125101B1 the fog switch grounds dedicated signal lines that act straight on the fog lamp relays; in US7230350B2 a fog switch shifts the voltage on the headlamp switch resistor chain, and the controller then adds the fog function. A circuit fault leaves the lamps dark or hides the request from the module.
- What you may notice
- Front fog lamps stay dark although the switch is on
- Fog lamp indicator lights up but only one lamp or none works
- Likely causes
- LikelyFog lamp relay or fuse failed, so the lamps get no supply although the switch is on
- PossibleLow-mounted harness in the front bumper torn or corroded, often after a parking knock or water ingress
- PossibleBulb burnt out or lamp housing flooded through a cracked lens
- RareFog position of the light switch worn or its signal line open
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.