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Engine-Codes – GMC – U0168 GMC

U0168 GMC Code - Lost Communication With Keyless Entry Control Module

Quick Answer

The U0168 GMC code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the keyless entry control module. Common causes include Faulty wiring or connectors in the keyless entry system, Malfunctioning keyless entry control module, Communication error between the ECM and keyless entry control module. 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
U0168 GMC indicates Lost Communication With Keyless Entry Control Module.
Common causes
Common causes include Faulty wiring or connectors in the keyless entry system, Malfunctioning keyless entry control module, Communication error between the ECM and keyless entry control module.
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 U0168 GMC Description

The U0168 GMC code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the keyless entry control module. The keyless entry control module is responsible for managing the keyless entry system, which allows the driver to lock and unlock the vehicle without using a physical key. When communication is lost with this module, it can lead to issues with the keyless entry system, potentially causing inconvenience for the driver.

OBDII Code U0168 GMC - Lost Communication With Keyless Entry Control Module
U0168 GMC Code - Lost Communication With Keyless Entry Control Module

Common Causes of U0168 GMC

  1. Faulty wiring or connectors in the keyless entry system.
  2. Malfunctioning keyless entry control module.
  3. Communication error between the ECM and keyless entry control module.
  4. Water damage to the keyless entry system components.
  5. Electrical interference affecting communication between modules.

Symptoms of U0168 GMC

  1. Keyless entry system not responding to key fob commands.
  2. Inability to lock or unlock the vehicle using the keyless entry system.
  3. Vehicle not starting when keyless entry system is not functioning.
  4. Warning light on the dashboard related to the keyless entry system.

How to Fix U0168 GMC

  1. Begin by conducting a thorough inspection of the keyless entry system wiring and connectors to check for any damage or loose connections.
  2. Use a diagnostic scanner to retrieve the specific communication error codes and pinpoint the source of the problem.
  3. Test the keyless entry control module to determine if it is functioning correctly or needs to be replaced.
  4. Check for any water damage to the keyless entry system components and address any issues found.
  5. If necessary, reprogram the keyless entry system to ensure proper communication with the ECM.

Cost to Fix U0168 GMC

The typical repair costs for addressing a U0168 GMC code can vary depending on the specific cause of the communication error. In general, the cost of parts for replacing a keyless entry control module can range from $200 to $500, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may fall between $300 and $700, but it is advisable to check with local auto repair shops for more accurate pricing based on the vehicle make and model, as well as other factors that can influence labor rates.

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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 U0168 GMC Code

1. What are the common symptoms of OBDII code U0168 in a GMC vehicle?

- Common symptoms include issues with the keyless entry system, difficulty locking or unlocking doors remotely, and warning lights on the dashboard.

2. What does the OBDII code U0168 indicate in a GMC vehicle?

- The code U0168 indicates that there is a communication problem between the vehicle's onboard computer and the keyless entry control module.

3. What are some possible causes of the U0168 code in a GMC vehicle?

- Possible causes include a faulty keyless entry control module, damaged wiring or connectors, low battery voltage, or a software glitch in the vehicle's computer system.

4. How can I diagnose the U0168 code in my GMC vehicle?

- Diagnosis typically involves using a diagnostic scanner to read the code, checking for other related codes, inspecting wiring and connectors, and testing the keyless entry control module.

5. Can I repair the U0168 code issue in my GMC vehicle myself?

- Depending on the cause, repairs may involve replacing the keyless entry control module, repairing damaged wiring, or reprogramming the vehicle's computer system. Some repairs may require professional assistance.

6. Is it safe to continue driving with the U0168 code present in my GMC vehicle?

- It is generally safe to drive with the U0168 code, but it is important to address the underlying issue promptly to avoid potential inconvenience or security risks related to the keyless entry system.

7. How much does it typically cost to repair the U0168 code in a GMC vehicle?

- Repair costs can vary depending on the specific cause of the issue, parts needed, and labor rates. It is recommended to obtain a diagnostic and repair estimate from a qualified mechanic.

8. Can a dead key fob battery cause the U0168 code to appear in a GMC vehicle?

- A dead key fob battery can contribute to communication issues with the keyless entry control module, potentially triggering the U0168 code. Replacing the key fob battery is a simple first step to troubleshoot the issue.

9. Are there any preventive measures to avoid encountering the U0168 code in a GMC vehicle?

- Regularly checking and replacing key fob batteries, ensuring proper maintenance of the keyless entry system, and addressing any warning signs promptly can help prevent the U0168 code from appearing.

10. Will resetting the vehicle's computer system clear the U0168 code in a GMC vehicle?

- Resetting the computer system may temporarily clear the code, but if the underlying issue is not addressed, the U0168 code is likely to reappear. It is recommended to diagnose and repair the root cause of the problem.

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