AutoCodes – GMC – U0105 GMC

U0105 GMC 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 GMC 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 1,265

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 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 Fuel Injector Control Module has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U0105 GMC?

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 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 U0105 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 U0105 GMC Code

What does the OBDII code U0105 indicate?

U0105 indicates a communication problem between the Engine Control Module (ECM) and the Fuel Injector Control Module (FICM), leading to a loss of data exchange.

What are the common symptoms of a U0105 code?

Common symptoms include poor engine performance, stalling, trouble starting, and the check engine light being illuminated.

What could cause the U0105 code to trigger?

Potential causes include wiring issues, a faulty Fuel Injector Control Module, a malfunctioning Engine Control Module, or problems with the vehicleâ€™s connectors.

How can I diagnose a U0105 code?

To diagnose U0105, check for any wiring or connector damage, use a scan tool to verify the code and any related codes, and test the FICM and ECM for proper function.

What are some common repair tips for a U0105 code?

Common repairs may involve repairing or replacing damaged wiring and connectors, reprogramming or replacing the FICM, or checking for updates on the ECM software.

Can I drive my vehicle with a U0105 code?

Driving with a U0105 code is not recommended, as it can lead to poor performance and potential engine damage due to improper fuel injection control.

How do I clear the U0105 code after repairs?

After repairs, you can clear the U0105 code using an OBDII scanner, or by disconnecting the vehicleâ€™s battery for a few minutes, although the scanner method is preferred for accuracy.

Is U0105 specific to certain GMC models?

While U0105 can occur in various vehicles, it is particularly noted in some GMC models, especially those with specific fuel injection systems.

What should I check first if I get a U0105 code?

Start by inspecting the wiring and connectors between the ECM and FICM for any visible damage or corrosion, as these are common culprits of communication issues.