OBD Guide
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B11C1

Passenger Side Rear Door Ajar Switch General Electrical Failure

B11C1 is an OBD-II diagnostic trouble code meaning: Passenger Side Rear Door Ajar Switch General Electrical Failure. Common causes: open or short circuit in the door wiring harness, door sensor malfunction. Estimated repair cost: $6–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Incorrect display of door status on the dashboard
  • The interior lights do not work when the door is opened.
  • Alarm does not work (false alarms)

Causes

  • Open or short circuit in the door wiring harness
  • Door sensor malfunction
  • Connector problems or contact corrosion
  • Body control module malfunction (rare)

How to Fix

  1. Check the integrity of the wiring harness between the door and the body (especially in the hinge area)
  2. Check the resistance of the door sensor
  3. Clean the connector and sensor contacts
  4. Replace sensor if necessary
  5. Check power and ground circuit

Related codes

B11C0B11C2B11C3

FAQ

What does the B11C1 code mean?

B11C1 is an OBD-II diagnostic trouble code that indicates: Passenger Side Rear Door Ajar Switch General Electrical Failure

What causes a B11C1 error code?

The most common causes of B11C1 include: Open or short circuit in the door wiring harness; Door sensor malfunction; Connector problems or contact corrosion; Body control module malfunction (rare).

How do I fix a B11C1 diagnostic trouble code?

To fix B11C1: Check the integrity of the wiring harness between the door and the body (especially in the hinge area). Check the resistance of the door sensor. Clean the connector and sensor contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B11C1?

Yes, but get it checked soon

How much does it cost to fix B11C1?

The estimated repair cost for B11C1 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat