OBD2 code B0100: Driver Door Lock Cylinder Switch Circuit
The body control module has detected a fault in the driver door lock cylinder switch circuit.
Detected Root Component
Body Component
Observed Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Possible Causes
- Lock cylinder switch failed
- Door harness broken in door hinge area
Tools Required
Interactive Diagnostic
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Diagnostic Result
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Parts likely to be the cause (Boîtier fusibles / BSI)
Boîtier fusibles / BSI
Photo d'illustration : Boîtier fusibles / BSI
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Frequently asked questions about code B0100
What does code B0100 mean? ▾
OBD2 code B0100: Driver Door Lock Cylinder Switch Circuit. The body control module has detected a fault in the driver door lock cylinder switch circuit.
What are the symptoms of code B0100? ▾
Code B0100 may cause: Warning light or symbol related to the affected system, Comfort or safety function impaired. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code B0100? ▾
The most common causes of code B0100 are: Lock cylinder switch failed, Door harness broken in door hinge area. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code B0100? ▾
Code B0100 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code B0100? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Lock cylinder switch failed, Door harness broken in door hinge area. Difficulty: Easy · Estimated time: 30-60min.