B0235Brake Lamp Circuit
- Generic OBD-II code · Body
- How the car detects it
- No publicly available J2012 list contains B0235, nor does any carmaker describe it, which leaves it unverified; side-specific brake lamp codes are B0850 and B0851. Stop lamps send a steady red signal rearward while the driver brakes, and FMVSS 108 also demands a third stop lamp mounted high. The brake light switch at the pedal triggers them, directly or via a body module. HELLA describes a Golf V in which one 21 W bulb works as tail lamp on a PWM signal of about 5.7 V and as stop lamp at a full 13.5 V, so one wiring fault can hit both jobs. On a Mitsubishi Grandis, moisture inside the brake light switch even lit the traction and stability warning lamps. A dark brake lamp raises the risk of being hit from behind.
- What you may notice
- One or more brake lamps stay dark when the pedal is pressed
- Bulb warning shown, sometimes together with traction or stability warning lamps
- Safety note: following traffic gets no braking signal; repair before further driving
- Likely causes
- LikelyStop lamp bulb or LED unit failed
- PossibleBrake light switch misadjusted, worn or wet inside
- PossibleBlown fuse or broken wire, often in the tailgate or boot lid harness
- RareCorroded lamp holder or plug in the rear light cluster
- Repair
- Easy · Often possible to do yourself.Typical cost: €10 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.