AutoCodes – GMC – U0168 GMC

U0168 GMC Code - Lost Communication With Keyless Entry Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Keyless Entry Control Module, Keyless Entry Control Module harness is open or shorted, Keyless Entry Control Module circuit poor electrical connection. 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 Keyless Entry Control Module, Keyless Entry Control Module harness is open or shorted, Keyless Entry Control Module circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,626

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U0168 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Keyless Entry Control Module has not been received.

OBDII Code U0168 GMC - Lost Communication With Keyless Entry Control Module - AutoCodes.com — U0168 GMC Code - Lost Communication With Keyless Entry Control Module

What does this mean?

What are the Possible Causes of the DTC U0168 GMC?

Faulty Keyless Entry Control Module
Keyless Entry Control Module harness is open or shorted
Keyless Entry Control Module circuit poor electrical connection

How to Fix the DTC U0168 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0168 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U0168 GMC code?

Need more information on how to fix the U0168 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0168 GMC code diagnosed by a professional: Find a repair shop in your area

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.