OBD Guide
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B1331

Decklid Ajar Rear Door Circuit Failure

B1331 is an OBD-II diagnostic trouble code meaning: Decklid Ajar Rear Door Circuit Failure. Common causes: rear door position sensor malfunction, open or shorted wiring harness. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Door open indicator on the dashboard
  • Incorrect operation of the central locking
  • False alarms
  • Inability to activate autonomous heating (if provided)

Causes

  • Rear door position sensor malfunction
  • Open or shorted wiring harness
  • Contact corrosion
  • Problems with the body module
  • Mechanical damage to the door lock or hinge

How to Fix

  1. Check the physical condition of the door position sensor
  2. Inspect the wiring harness for damage
  3. Check contacts for oxidation and corrosion
  4. Test the sensor operation with a multimeter
  5. If necessary, replace the sensor or repair the wiring harness
  6. Clean and lubricate the lock mechanism

Related codes

B1332B1333B1330

FAQ

What does the B1331 code mean?

B1331 is an OBD-II diagnostic trouble code that indicates: Decklid Ajar Rear Door Circuit Failure

What causes a B1331 error code?

The most common causes of B1331 include: Rear door position sensor malfunction; Open or shorted wiring harness; Contact corrosion; Problems with the body module.

How do I fix a B1331 diagnostic trouble code?

To fix B1331: Check the physical condition of the door position sensor. Inspect the wiring harness for damage. Check contacts for oxidation and corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1331?

Yes, but get it checked soon

How much does it cost to fix B1331?

The estimated repair cost for B1331 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat