B0235
Brake Lamp Circuit
The body control module has detected a fault in the brake lamp circuit. One or more brake lamps do not match the commanded state — a safety-relevant fault.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
Ordered by how often each turns out to be the cause.
- Bulb burned outCommon
- Brake light switch failedPossible
Parts involved
- Brake Lamp
- Brake Light Switch
- Body Wiring Harness
B0235 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.