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U0167 GMC Code - Lost Communication With Immobilizer Control Module

Quick Answer

The U0167 diagnostic trouble code (DTC) for GMC vehicles indicates that there is a communication problem between the vehicle's engine control module (ECM) and the immobilizer control module. Common causes include Faulty immobilizer control module, Wiring issues or loose connections between the ECM and immobilizer control module, Malfunctioning ECM. 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
U0167 GMC indicates Lost Communication With Immobilizer Control Module.
Common causes
Common causes include Faulty immobilizer control module, Wiring issues or loose connections between the ECM and immobilizer control module, Malfunctioning ECM.
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 13, 2024
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Code U0167 GMC Description

The U0167 diagnostic trouble code (DTC) for GMC vehicles indicates that there is a communication problem between the vehicle's engine control module (ECM) and the immobilizer control module. The immobilizer control module is responsible for preventing the vehicle from starting without the correct key or key fob. When communication is lost with this module, it can lead to issues with starting the vehicle or potentially even immobilizing it.

OBDII Code U0167 GMC - Lost Communication With Immobilizer Control Module
U0167 GMC Code - Lost Communication With Immobilizer Control Module

Common Causes of U0167 GMC

  1. Faulty immobilizer control module
  2. Wiring issues or loose connections between the ECM and immobilizer control module
  3. Malfunctioning ECM
  4. Key or key fob issues, such as a dead battery or programming problems

Symptoms of U0167 GMC

  1. Engine cranks but does not start
  2. Engine starts but immediately stalls
  3. Immobilizer warning light illuminated on the dashboard
  4. Inability to start the vehicle with the correct key or key fob

How to Fix U0167 GMC

  1. Perform a thorough inspection of the wiring harness between the ECM and immobilizer control module to check for any damaged or loose connections.
  2. Test the immobilizer control module and ECM for proper functioning using a diagnostic scan tool.
  3. If the immobilizer control module is faulty, it will need to be replaced with a new unit and reprogrammed to work with the vehicle's keys.
  4. If the ECM is found to be malfunctioning, it may need to be repaired or replaced, depending on the extent of the damage.
  5. Ensure that the keys or key fobs are in good working condition and properly programmed to the vehicle.

Cost to Fix U0167 GMC

The cost of repairing a U0167 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, replacing a faulty immobilizer control module can cost anywhere from $200 to $500, including parts and labor. If the ECM needs to be repaired or replaced, the cost can range from $500 to $1000 or more. It is important to factor in diagnostic time and labor rates, which can vary between $80 and $150 per hour. It is recommended to consult with a professional mechanic to get an accurate estimate for 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 U0167 GMC Code

1. What are the common symptoms of OBDII code U0167 GMC (Lost Communication With Immobilizer Control Module)?

- Common symptoms include difficulty starting the vehicle, engine stalling, and the inability to engage the ignition system.

2. What are the possible causes of U0167 GMC code?

- The code U0167 usually indicates a communication issue between the vehicle's ECM/PCM and the Immobilizer Control Module. This could be due to wiring issues, a faulty module, or a software glitch.

3. How can I diagnose the U0167 code in my GMC vehicle?

- Diagnosing the U0167 code typically involves checking the wiring connections between the ECM/PCM and the Immobilizer Control Module, as well as testing the modules themselves for proper functionality.

4. Can I still drive my GMC with the U0167 code present?

- It is not recommended to drive your vehicle with the U0167 code present, as it may lead to starting issues or engine stalling, which can be unsafe.

5. How can I repair the U0167 code in my GMC vehicle?

- Repairing the U0167 code may involve fixing any wiring issues, replacing the Immobilizer Control Module if necessary, or updating the software in the affected modules.

6. Is it possible to reset the U0167 code without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, it is important to address the underlying communication problem to prevent further issues.

7. Can a DIY enthusiast fix the U0167 code issue?

- Depending on your experience and access to diagnostic tools, some DIY enthusiasts may be able to diagnose and fix the U0167 code. However, complex electrical issues may require professional assistance.

8. How much does it typically cost to repair the U0167 code in a GMC vehicle?

- The cost of repairing the U0167 code can vary depending on the exact cause of the issue, but it may involve expenses for parts and labor, ranging from a few hundred to a thousand dollars.

9. How long does it take to repair the U0167 code in a GMC vehicle?

- The repair time for the U0167 code can vary based on the complexity of the issue and the availability of parts. It may take a few hours to a day for a professional technician to diagnose and fix the problem.

10. Can the U0167 code reoccur after it has been repaired?

- If the root cause of the U0167 code is not properly addressed during the repair, there is a possibility that the code may reoccur. It is essential to ensure that all related issues are resolved to prevent future occurrences.

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