B0102
Power Mirror Switch Circuit
The body control module has detected a fault in the power mirror switch circuit. The switch input does not match a valid pattern — mirror adjustment may be inoperative.
- 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.
- Mirror switch failedCommon
- Wiring or connector openPossible
Parts involved
- Mirror Switch
- Door Wiring Harness
- Body Control Module
B0102 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.