AutoCodes – Buick – U0167 Buick

U0167 Buick 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 Buick 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 739

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

What does this mean?

What are the Possible Causes of the DTC U0167 Buick?

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 Buick?

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 Buick 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 Buick Code

What does OBDII code U0167 mean for a Buick?

1. Code U0167 indicates that the vehicle's diagnostic system has lost communication with the Immobilizer Control Module (ICM), which is responsible for ensuring only authorized keys can start the engine. 2.

What are the symptoms of code U0167 in a Buick?

Common symptoms include the engine not starting, the security or immobilizer warning light illuminated, and possibly a no-crank condition. 3.

What causes code U0167 to appear in a Buick?

The most common causes are a faulty Immobilizer Control Module, wiring issues such as damaged or corroded connections, a blown fuse, or issues with the CAN (Controller Area Network) communication system. 4.

Can I still drive my Buick with code U0167?

Typically, no. Since this code often prevents the engine from starting, the vehicle is usually immobilized until the issue is resolved. 5.

How do I diagnose code U0167 on my Buick?

Start by inspecting the wiring and connectors to the Immobilizer Control Module for damage or corrosion. Check for blown fuses and scan the vehicle with a diagnostic tool to verify communication errors. 6.

How is code U0167 fixed on a Buick?

Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, replacing a blown fuse, or replacing the Immobilizer Control Module if it is faulty. 7.

Does a bad battery cause code U0167 in a Buick?

Yes, a weak or failing battery can disrupt communication between modules, including the Immobilizer Control Module, potentially triggering code U0167. 8.

How much does it cost to fix code U0167 on a Buick?

Costs vary depending on the issue. Simple fixes like repairing wiring or replacing a fuse may cost under $100, while replacing the Immobilizer Control Module could range from $300 to $800, including labor. 9.

Can a software issue trigger code U0167 in a Buick?

Yes, outdated or corrupted software in the vehicleâ€™s control modules can sometimes cause communication errors, including U0167. A reprogramming or software update may resolve the issue. 10.

What tools are needed to troubleshoot code U0167 in a Buick?

A diagnostic scan tool capable of reading manufacturer-specific codes and monitoring CAN communication is essential. Additionally, a multimeter can help test wiring and connections.