B0231Front Marker Lamp Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0231 is found neither in any publicly available J2012 list nor in public service documents of a carmaker, so the code cannot be verified. The title points to the front marker or position lamps. FMVSS 108 places side marker lamps close to the leading and trailing ends of the body so that, seen from the side, they reveal how long the vehicle is. HELLA lists front marker lights as white, or amber where the headlamps are amber, and mandatory on vehicles wider than 1600 mm. They normally light in the park position of the light switch. A module that switches them electronically can spot a missing load: Ford's patent US4667187A briefly toggles each lamp for about 300 µs and flags a fault when no current change follows. Expect a dark marker lamp and, where fitted, a bulb warning.
- What you may notice
- One front marker or position lamp stays dark with parking lights on
- Bulb failure warning in the instrument cluster, where the car has one
- Likely causes
- LikelyBulb or LED module of the marker lamp failed
- PossibleCorroded bulb holder or plug in the headlamp area, where spray water reaches it
- RareFeed or ground wire to the front lamp open or shorted
- Repair
- Easy · Often possible to do yourself.Typical cost: €10 – €120
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.