Body
Definition only
B0540: Driver Door Ajar Switch Circuit
Standardized SAE J2012 code · B05xx codes
What does B0540 mean?
The driver door ajar switch circuit is reporting an implausible signal. The interior light may stay on or door open warning may be incorrect.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
- High Corroded door switch / striker
- Medium Wire break in door harness
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of B0540 on the same make and model first.
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