OBD Guide
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B2100

Door Driver Key Cylinder Switch Failure

B2100 is an OBD-II diagnostic trouble code meaning: Door Driver Key Cylinder Switch Failure. Common causes: lock limit switch faulty, open or shorted wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of the central locking
  • Alarm problems
  • Immobilizer malfunction
  • Flashing safety light on the dashboard

Causes

  • Lock limit switch faulty
  • Open or shorted wiring harness
  • Oxidation of contacts
  • Mechanical damage to the lock

How to Fix

  1. Check the operation of the limit switch with a multimeter
  2. Inspect the wiring harness for damage
  3. Clean contacts from oxidation
  4. If necessary, replace the limit switch or the entire lock

Related codes

B2101B2102B2103

FAQ

What does the B2100 code mean?

B2100 is an OBD-II diagnostic trouble code that indicates: Door Driver Key Cylinder Switch Failure

What causes a B2100 error code?

The most common causes of B2100 include: Lock limit switch faulty; Open or shorted wiring harness; Oxidation of contacts; Mechanical damage to the lock.

How do I fix a B2100 diagnostic trouble code?

To fix B2100: Check the operation of the limit switch with a multimeter. Inspect the wiring harness for damage. Clean contacts from oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2100?

Yes, but get it checked soon

How much does it cost to fix B2100?

The estimated repair cost for B2100 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat