OBD Guide
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B1309

Power Door Lock Circuit Short To Ground

B1309 is an OBD-II diagnostic trouble code meaning: Power Door Lock Circuit Short To Ground. Common causes: damage to the wiring in the door harness, lockout solenoid short circuit. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Central locking doesn't work
  • Doors do not lock/unlock
  • Alarm going off for no reason
  • Door lock light flashing

Causes

  • Damage to the wiring in the door harness
  • Lockout solenoid short circuit
  • Contact corrosion
  • Body Control Module (BCM) Malfunction
  • Mechanical damage to the chain after repair

How to Fix

  1. Check the integrity of the wiring in the door harness
  2. Inspect the locking solenoids for shorts.
  3. Check contacts and connectors for corrosion
  4. Test the BCM for correct operation
  5. Replace damaged components

Related codes

B1310B1311B1312

FAQ

What does the B1309 code mean?

B1309 is an OBD-II diagnostic trouble code that indicates: Power Door Lock Circuit Short To Ground

What causes a B1309 error code?

The most common causes of B1309 include: Damage to the wiring in the door harness; Lockout solenoid short circuit; Contact corrosion; Body Control Module (BCM) Malfunction.

How do I fix a B1309 diagnostic trouble code?

To fix B1309: Check the integrity of the wiring in the door harness. Inspect the locking solenoids for shorts.. Check contacts and connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1309?

Limited driving only, diagnose soon

How much does it cost to fix B1309?

The estimated repair cost for B1309 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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