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U0167 Cadillac Code - Lost Communication With Immobilizer Control Module

Quick Answer

The U0167 diagnostic trouble code (DTC) for Cadillac vehicles indicates that there is a communication problem between the engine control module (ECM) and the immobilizer control module. Common causes include Faulty wiring or connections between ECM and immobilizer control module, Malfunctioning immobilizer control module, ECM software issue. 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 Cadillac indicates Lost Communication With Immobilizer Control Module.
Common causes
Common causes include Faulty wiring or connections between ECM and immobilizer control module, Malfunctioning immobilizer control module, ECM software issue.
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 Cadillac Description

The U0167 diagnostic trouble code (DTC) for Cadillac vehicles indicates that there is a communication problem between the 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, which is essential for anti-theft purposes. When communication is lost with this module, it can lead to issues with starting the vehicle, as the ECM may not receive the necessary authorization to allow the engine to run.

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

Common Causes of U0167 Cadillac

  1. Faulty wiring or connections between ECM and immobilizer control module
  2. Malfunctioning immobilizer control module
  3. ECM software issue
  4. Dead or low battery in the key fob
  5. Aftermarket modifications interfering with communication

Symptoms of U0167 Cadillac

  1. Engine cranks but does not start
  2. Engine starts but immediately shuts off
  3. Security light on the dashboard stays illuminated
  4. Inability to program new keys
  5. Immobilizer warning message on the instrument cluster

How to Fix U0167 Cadillac

  1. Perform a thorough inspection of wiring and connections between ECM and immobilizer control module
  2. Test immobilizer control module for proper functionality
  3. Update ECM software to the latest version
  4. Replace key fob battery if low or dead
  5. Remove any aftermarket modifications that may be causing interference

Cost to Fix U0167 Cadillac

The typical repair costs for addressing the U0167 code can range from $200 to $500, depending on the specific cause of the communication failure and the necessary repairs. This estimate includes parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate based on your location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher at dealerships or in metropolitan areas, and lower at independent shops.

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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 Cadillac Code

1. What are the common symptoms of OBDII code U0167 in a Cadillac related to lost communication with the immobilizer control module?

The common symptoms may include issues with starting the vehicle, the engine stalling, or the vehicle not recognizing the key.

2. What are some possible causes of the OBDII code U0167 in a Cadillac?

Potential causes of this code include a faulty immobilizer control module, damaged wiring or connectors, a weak car battery, or a software glitch.

3. How can I diagnose the OBDII code U0167 in my Cadillac?

Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific codes, checking the wiring and connectors for any visible damage, and testing the immobilizer control module.

4. Can I still drive my Cadillac if the U0167 code related to the immobilizer control module is present?

It is not recommended to drive the vehicle with this code present, as it may lead to starting issues or engine stalling while driving.

5. How can I repair the OBDII code U0167 in my Cadillac?

Repairing this code usually involves fixing any damaged wiring or connectors, replacing the immobilizer control module if necessary, and ensuring proper communication between the module and other components.

6. Is it possible to reset the U0167 code in a Cadillac without professional help?

While you can attempt to clear the code using an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring.

7. Will disconnecting the car battery reset the U0167 code in a Cadillac?

Disconnecting the car battery may reset the code temporarily, but it is essential to diagnose and repair the root cause of the communication issue to prevent the code from coming back.

8. How much does it typically cost to repair the U0167 code related to the immobilizer control module in a Cadillac?

The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a couple thousand dollars, including parts and labor.

9. Can extreme weather conditions affect the occurrence of the U0167 code in a Cadillac?

Extreme weather conditions, especially temperature fluctuations, can potentially impact the communication between the immobilizer control module and other components, leading to the U0167 code.

10. Is it necessary to visit a dealership for OBDII code U0167 repair in a Cadillac, or can it be done by an independent mechanic?

While a dealership may have specialized knowledge and tools for Cadillac vehicles, an experienced independent mechanic can also diagnose and repair the U0167 code effectively, potentially at a lower cost.

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