AutoCodes – GMC – U0167 GMC

U0167 GMC Code - Lost Communication With Immobilizer 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 Immobilizer Control Module, Immobilizer Control Module harness is open or shorted, Immobilizer 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: U0167 GMC indicates Lost Communication With Immobilizer Control Module.
Common causes: Common causes include Faulty Immobilizer Control Module, Immobilizer Control Module harness is open or shorted, Immobilizer 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.

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Code Popularity 818

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
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Code U0167 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 Immobilizer Control Module has not been received.

OBDII Code U0167 GMC - Lost Communication With Immobilizer Control Module - AutoCodes.com — U0167 GMC Code - Lost Communication With Immobilizer Control Module

What does this mean?

What are the Possible Causes of the DTC U0167 GMC?

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

How to Fix the DTC U0167 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 U0167 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.

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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.