B0520
Passenger Door Open Switch
The body control module has detected a fault in the passenger door open (jamb) switch. Same fault profile as B0510 but for the passenger door.
- 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.
- Door jamb switch stuck or corrodedCommon
- Wiring open in door hingePossible
Parts involved
- Door Jamb Switch
- Door Wiring Harness
- Body Control Module
B0520 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.