AutoCodes – Buick – U0105 Buick

U0105 Buick Code - Lost Communication With Fuel Injector 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 Fuel Injector Control Module, Fuel Injector Control Module harness is open or shorted, Fuel Injector 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: U0105 Buick indicates Lost Communication With Fuel Injector Control Module.
Common causes: Common causes include Faulty Fuel Injector Control Module, Fuel Injector Control Module harness is open or shorted, Fuel Injector 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 669

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 Mar 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0105 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 Fuel Injector Control Module has not been received.

OBDII Code U0105 Buick - Lost Communication With Fuel Injector Control Module - AutoCodes.com — U0105 Buick Code - Lost Communication With Fuel Injector Control Module

What does this mean?

What are the Possible Causes of the DTC U0105 Buick?

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

How to Fix the DTC U0105 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 U0105 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 U0105 Buick Code

1. What does OBDII code U0105 mean on a Buick?

Code U0105 indicates that the vehicle has lost communication with the fuel injector control module (FICM), which manages fuel delivery to the engine.

2. What are the common symptoms of code U0105 in a Buick?

Symptoms include poor engine performance, difficulty starting, reduced fuel efficiency, stalling, or an illuminated check engine light.

3. What causes the U0105 code to appear?

Common causes include a faulty fuel injector control module, damaged wiring or connectors, issues with the CAN bus network, or a dead battery.

4. Can a weak battery trigger code U0105 in my Buick?

Yes, a weak or failing battery can cause communication issues between the control modules, potentially triggering the U0105 code.

5. How do I diagnose the U0105 code in a Buick?

Start by checking the wiring and connectors for damage or loose connections. Use a scan tool to verify communication with the FICM and test the CAN bus network for faults.

6. Is it safe to drive a Buick with the U0105 code?

Driving with this code can result in poor performance or engine stalling, which may be unsafe. Itâ€™s best to address the issue as soon as possible.

7. How can I fix the U0105 code on my Buick?

Repairs may involve replacing the FICM, repairing damaged wiring, cleaning or reconnecting loose connectors, or diagnosing CAN bus issues.

8. Does the U0105 code mean the fuel injector control module is bad?

Not necessarily. The issue could be due to wiring, connectors, or network communication problems rather than the module itself.

9. Will clearing the U0105 code fix the problem?

Clearing the code will remove it temporarily, but if the underlying issue isnâ€™t addressed, the code will likely reappear.

10. How much does it cost to repair code U0105 on a Buick?

The repair cost depends on the cause. Wiring repairs or connector replacements are relatively inexpensive, while replacing the FICM can cost several hundred dollars.