What does it mean?
B2100 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Ignition Run/Start Input Circuit Performance .
Door Driver Key Cylinder Switch Failure
Severity
Medium
Can I keep driving?
Usually drivable, but get it diagnosed without delay.
First step
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Identify exactly which system isn't working, B2100 is broad but the symptom usually narrows it quickly 2. Check fuses for that circuit, free quick check that catches a meaningful share of cases 3. Inspect the wiring at the door rubber if the fault is door-related, broken wires inside the rubber concertina are extremely common on older cars 4. Test the affected motor or actuator at the connector with a 12V supply, does it operate when given power directly? 5. If wiring and components are healthy, the BCM may be the issue; that needs Chrysler-specific diagnostic equipment
- BBody
- 2Manufacturer-specific
- 1Body
- 00Sequence number
Codes From the Same System
All Fault Codes- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Driver Frontal Stage 3 Deployment Control
- B0004Driver Knee Bolster Deployment Control
- B0005Collapsible Steering Column Deployment Control
- B0010Passenger Frontal Stage 1 Deployment Control
- B0011Passenger Frontal Stage 2 Deployment Control
- B0012Passenger Frontal Stage 3 Deployment Control
Related Similar Codes
- B2101Head Rest Switch Circuit Failure
- B2102Antenna Circuit Short to Ground
- B2103Antenna Not Connected
- B2104Door Passenger Key Cylinder Switch Failure
- B2105Throttle Position Input Out of Range Low
- B2106Throttle Position Input Out of Range High
- B2107Front Wiper Motor Relay Circuit Short to Vbatt
- B2108Trunk Key Cylinder Switch Failure
This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.