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Engine-Codes – Generic – B1249

B1249 Code - Double Locking ECU Communication Stop

Quick Answer

The B1249 diagnostic trouble code (DTC) refers to a Double Locking ECU Communication Stop. Common causes include Faulty wiring or connections in the double locking system, Defective Double Locking ECU, Communication bus failure. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1249 indicates Double Locking ECU Communication Stop.
Common causes
Common causes include Faulty wiring or connections in the double locking system, Defective Double Locking ECU, Communication bus failure.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B1249 Description

The B1249 diagnostic trouble code (DTC) refers to a Double Locking ECU Communication Stop. This code indicates a communication error between the Double Locking Electronic Control Unit (ECU) and other modules in the vehicle's network. The Double Locking ECU is responsible for controlling the vehicle's double locking system, which enhances security by preventing unauthorized entry into the vehicle. When communication between the ECU and other modules is interrupted, it can lead to malfunctions in the double locking system, compromising the vehicle's security.

OBDII Code B1249 - Double Locking ECU Communication Stop
B1249 Code - Double Locking ECU Communication Stop

Common Causes of B1249

  1. Faulty wiring or connections in the double locking system
  2. Defective Double Locking ECU
  3. Communication bus failure
  4. Software issues in the ECU or other modules
  5. Water damage or corrosion in the ECU or wiring

Symptoms of B1249

  1. Inability to lock or unlock doors electronically
  2. Erratic behavior of the double locking system
  3. Vehicle not starting
  4. Warning lights illuminated on the dashboard

How to Fix B1249

  1. Perform a thorough inspection of the wiring and connections in the double locking system to check for any damage or corrosion.
  2. Use a diagnostic scan tool to communicate with the Double Locking ECU and other modules to identify the source of the communication error.
  3. If necessary, replace the Double Locking ECU with a new or remanufactured unit.
  4. Clear the DTC from the vehicle's memory and test the double locking system to ensure proper functionality.
  5. Address any underlying electrical issues that may have contributed to the communication error.

Cost to Fix B1249

The cost of repairing a Double Locking ECU Communication Stop issue can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of replacing a Double Locking ECU can range from $200 to $600, including parts and labor. Additional costs may be incurred if there are other underlying electrical issues that need to be addressed. It's important to consult with a qualified mechanic or automotive technician for a precise estimate tailored to your vehicle's make and model. Keep in mind that labor rates can vary between different auto repair shops, so it's advisable to shop around for the best deal.

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Code B1249 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1249 Code

1. What are the common symptoms of OBDII code B1249, Double Locking ECU Communication Stop?

- Common symptoms include the inability to lock or unlock the doors remotely, malfunctioning interior lights, and issues with the alarm system.

2. What are the possible causes of OBDII code B1249?

- Possible causes include damaged wiring harnesses, faulty door lock actuators, a malfunctioning double locking ECU, or issues with the communication network between modules in the vehicle.

3. How can I diagnose the issue causing OBDII code B1249?

- Diagnosing the issue may involve checking the wiring connections, inspecting the door lock actuators, and using a scan tool to communicate with the double locking ECU to identify any communication faults.

4. What are some repair tips for fixing OBDII code B1249?

- Repair tips may include repairing or replacing damaged wiring, testing and replacing faulty door lock actuators, resetting or reprogramming the double locking ECU, and ensuring proper communication between vehicle modules.

5. Can OBDII code B1249 be cleared/reset without fixing the underlying issue?

- While the code can be cleared temporarily, it is important to address the underlying issue causing the communication stop to prevent the code from reoccurring and ensure proper functioning of the vehicle's locking system.

6. Is it safe to continue driving with OBDII code B1249 present?

- It may be safe to drive with this code, but it is recommended to address the issue promptly to avoid potential security risks or further damage to the vehicle's locking system.

7. How much does it typically cost to repair OBDII code B1249?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services from a professional mechanic or dealership.

8. Can I fix OBDII code B1249 myself, or should I seek professional help?

- Depending on your level of automotive knowledge and experience, you may attempt to diagnose and repair the issue yourself. However, seeking professional help from a qualified mechanic or dealership is advisable for accurate diagnosis and proper repair.

9. Are there any preventative measures to avoid OBDII code B1249 in the future?

- Regular maintenance of the vehicle's locking system, checking for any signs of wear or damage, and addressing any related issues promptly can help prevent the occurrence of OBDII code B1249 in the future.

10. Will fixing OBDII code B1249 improve the overall functionality of my vehicle's locking system?

- Yes, addressing and resolving OBDII code B1249 should improve the functionality of your vehicle's locking system, allowing for proper remote locking and unlocking, as well as ensuring the security features operate correctly.

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