OBD Guide
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B1249

Double Locking ECU Communication Stop

B1249 is an OBD-II diagnostic trouble code meaning: Double Locking ECU Communication Stop. Common causes: open or short circuit in wiring harness, double locking ecu malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Central locks don't work
  • Immobilizer problems
  • Check Engine light comes on
  • Malfunctions of the passive safety system

Causes

  • Open or short circuit in wiring harness
  • Double locking ECU malfunction
  • Poor contact in connectors
  • Software failure in the ECU

How to Fix

  1. Check wiring harness for damage
  2. Inspect the ECU connectors and clean the contacts
  3. Scan other modules for errors
  4. Reflash or replace the dual locking ECU

Related codes

B1248B1250U0100

FAQ

What does the B1249 code mean?

B1249 is an OBD-II diagnostic trouble code that indicates: Double Locking ECU Communication Stop

What causes a B1249 error code?

The most common causes of B1249 include: Open or short circuit in wiring harness; Double locking ECU malfunction; Poor contact in connectors; Software failure in the ECU.

How do I fix a B1249 diagnostic trouble code?

To fix B1249: Check wiring harness for damage. Inspect the ECU connectors and clean the contacts. Scan other modules for errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1249?

Limited driving only, diagnose soon

How much does it cost to fix B1249?

The estimated repair cost for B1249 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat