OBD-II code · Body
B0100 Driver Door Lock Cylinder Switch Circuit
The body control module has detected a fault in the driver door lock cylinder switch circuit. This switch detects key rotation in the door lock and is used for keyless functions and the alarm system.
Is it safe to drive with B0100?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLock cylinder switch failed
- PossibleDoor harness broken in door hinge area
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Door Lock Cylinder Switch, Body Control Module, Door Harness
Related codes
- B00F5Third Row Left Inflatable Seat Belt Deployment Control
- B00F6Third Row Center Inflatable Seat Belt Deployment Control
- B00F7Third Row Right Inflatable Seat Belt Deployment Control
- B0101Front Crash Sensor Circuit Malfunction
- B0102Power Mirror Switch Circuit
- B0103Front Crash Sensor Left Communication Lost
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.