OBD Guide
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B11E9

Left Rear Door Ajar Switch Circuit Open

B11E9 is an OBD-II diagnostic trouble code meaning: Left Rear Door Ajar Switch Circuit Open. Common causes: broken or damaged wiring harness, door sensor malfunction. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Incorrect display of the left rear door status on the instrument panel
  • Interior lighting or alarm does not work when the door is opened
  • Constant door warning

Causes

  • Broken or damaged wiring harness
  • Door sensor malfunction
  • Poor contact in the sensor connector
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the status of the door sensor
  3. Clean contacts in connectors
  4. Replace sensor if necessary

Related codes

B11EAB11EBB11EC

FAQ

What does the B11E9 code mean?

B11E9 is an OBD-II diagnostic trouble code that indicates: Left Rear Door Ajar Switch Circuit Open

What causes a B11E9 error code?

The most common causes of B11E9 include: Broken or damaged wiring harness; Door sensor malfunction; Poor contact in the sensor connector; Contact corrosion.

How do I fix a B11E9 diagnostic trouble code?

To fix B11E9: Check the integrity of the wiring harness. Check the status of the door sensor. Clean contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B11E9?

Limited driving only, diagnose soon

How much does it cost to fix B11E9?

The estimated repair cost for B11E9 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat