U02BF
Lost Communication With Interior Lighting Control Module B
The vehicle bus reports loss of communication with interior lighting control module B. Ambient lighting zones, reading lamps and door courtesy lights driven by this node fall back to a default state.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Bus wiring open or shortedCommon
- Module without power or groundPossible
- Module failedPossible
Parts involved
- Interior Lighting Module B
- Vehicle Bus Wiring
U02BF 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.