What causes B2100 on a Ford?

Worn driver door key cylinder switch Open or shorted cylinder switch circuit Water intrusion into the door latch Broken actuator linkage Corroded door harness connector

How do I fix B2100 on a Ford?

Test lock and unlock inputs from the driver key Inspect the latch and linkage Check the door harness boot for breaks Test switch continuity Replace the cylinder switch per findings

B2100 Door Driver Key Cylinder Switch Failure

Q: What does B2100 mean on a Ford?

B2100 — Door Driver Key Cylinder Switch Failure. Applies to F-150, Explorer, Taurus with door key cylinders.

Category: Body
Severity: Check Engine Light
Applies to: F-150, Explorer, Taurus with door key cylinders

What does B2100 mean on a Ford?

B2100 — Door Driver Key Cylinder Switch Failure. This Ford-enhanced code applies to F-150, Explorer, Taurus with door key cylinders.

Common causes of B2100

Worn driver door key cylinder switch
Open or shorted cylinder switch circuit
Water intrusion into the door latch
Broken actuator linkage
Corroded door harness connector

How to fix B2100

Test lock and unlock inputs from the driver key
Inspect the latch and linkage
Check the door harness boot for breaks
Test switch continuity
Replace the cylinder switch per findings