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U2137 Buick Code - Lost Communications With Vehicle Theft Deterrent Module

Quick Answer

The U2137 Buick code indicates that there is a communication error between the vehicle's onboard computer system and the Vehicle Theft Deterrent (VTD) module. Common causes include Faulty wiring or connections between the vehicle's computer and the VTD module, Malfunctioning VTD module, Corrosion or damage to the wiring harness. 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
U2137 Buick indicates Lost Communications With Vehicle Theft Deterrent Module.
Common causes
Common causes include Faulty wiring or connections between the vehicle's computer and the VTD module, Malfunctioning VTD module, Corrosion or damage to the wiring harness.
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 16, 2024
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Code U2137 Buick Description

The U2137 Buick code indicates that there is a communication error between the vehicle's onboard computer system and the Vehicle Theft Deterrent (VTD) module. The VTD module is responsible for preventing unauthorized access to the vehicle by disabling the engine's starting system if an invalid key is used. When communication is lost with this module, it can lead to issues with starting the vehicle, as the engine may be immobilized due to the VTD system being unable to verify the key's authenticity.

OBDII Code U2137 Buick - Lost Communications With Vehicle Theft Deterrent Module
U2137 Buick Code - Lost Communications With Vehicle Theft Deterrent Module

Common Causes of U2137 Buick

  1. Faulty wiring or connections between the vehicle's computer and the VTD module
  2. Malfunctioning VTD module
  3. Corrosion or damage to the wiring harness
  4. Software issues in the vehicle's computer system
  5. Faulty ignition switch

Symptoms of U2137 Buick

  1. Engine not starting or starting and immediately stalling
  2. Security light illuminated on the dashboard
  3. Vehicle going into "security" or "anti-theft" mode
  4. Inability to start the vehicle with a valid key

How to Fix U2137 Buick

  1. Diagnose the issue by using a scan tool to retrieve the specific error codes and identify the communication problem.
  2. Inspect the wiring and connections between the vehicle's computer and the VTD module for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the VTD module for proper functionality and replace if it is found to be faulty.
  4. Check for any software updates for the vehicle's computer system that may address communication issues with the VTD module.
  5. If the issue persists, consider replacing the ignition switch, as a faulty switch can also cause communication errors with the VTD module.

Cost to Fix U2137 Buick

The typical repair costs for addressing a U2137 Buick code can vary depending on the specific cause of the communication error. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. However, it's important to note that the actual cost can be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. It's recommended to consult with a trusted mechanic or dealership to get a more accurate estimate based on your specific situation. Keep in mind that diagnostic time and labor rates can also impact the overall cost of the repair.

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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 U2137 Buick Code

1. What does the OBDII code U2137 mean on a Buick?

The U2137 code indicates a "Lost Communication With Vehicle Theft Deterrent Module," meaning the module is not communicating properly with other control modules in the vehicle.

2. What are the common symptoms of the U2137 code on a Buick?

Common symptoms include the engine not starting, security warning light staying on, intermittent starting issues, or other security system malfunctions.

3. What causes the U2137 code to appear on a Buick?

Causes can include faulty wiring or connections, a failing vehicle theft deterrent module, a dead battery, or issues with the CAN (Controller Area Network) bus system.

4. Can a weak car battery trigger the U2137 code?

Yes, a weak or failing battery can cause communication issues between modules, potentially triggering the U2137 code.

5. How can I diagnose the U2137 code on my Buick?

Start by checking the battery voltage, inspecting wiring and connectors for damage or corrosion, and using a scan tool to verify communication with the theft deterrent module.

6. Is the U2137 code specific to Buick vehicles?

No, the U2137 code can appear on various vehicles, but the troubleshooting steps and symptoms may differ depending on the make and model.

7. Can I drive my Buick with the U2137 code active?

Driving may not be possible if the theft deterrent system prevents the engine from starting. Even if the car starts, it’s important to address the issue promptly.

8. How do I fix the U2137 code on a Buick?

Repairs may involve replacing damaged wiring, reconnecting loose connectors, reprogramming or replacing the theft deterrent module, or addressing issues in the CAN bus system.

9. Does the U2137 code require professional repair?

While basic checks like inspecting wiring can be done at home, diagnosing and repairing module communication issues often require specialized tools and expertise.

10. Can resetting the ECU clear the U2137 code?

Resetting the ECU might temporarily clear the code, but if the underlying issue isn’t resolved, the code is likely to return.

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