AutoCodes – Saturn – U0105 Saturn

U0105 Saturn 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 Saturn 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 613

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 May 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0105 Saturn 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 Saturn - Lost Communication With Fuel Injector Control Module - AutoCodes.com — U0105 Saturn Code - Lost Communication With Fuel Injector Control Module

What does this mean?

What are the Possible Causes of the DTC U0105 Saturn?

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 Saturn?

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 Saturn 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 U0105 Saturn code?

Need more information on how to fix the U0105 Saturn code? Get Access to Factory Service Manuals

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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 Saturn Code

1. What does the OBDII code U0105 mean for a Saturn?

U0105 indicates that the vehicleâ€™s Engine Control Module (ECM) has lost communication with the Fuel Injector Control Module (FICM).

2. What are the common symptoms of U0105 on a Saturn?

Symptoms may include engine misfires, poor fuel economy, difficulty starting, lack of power, or the engine not starting at all.

3. What causes the U0105 code to appear?

Common causes include faulty wiring or connectors, a malfunctioning Fuel Injector Control Module, issues with the ECM, or a blown fuse related to the communication circuit.

4. Can a bad battery cause the U0105 code?

Yes, a weak or failing battery can cause voltage drops that disrupt communication between the ECM and FICM, triggering the U0105 code.

5. How can I fix the U0105 code on my Saturn?

Start by inspecting the wiring and connectors between the ECM and FICM for damage, corrosion, or disconnection. Repair or replace as necessary. If the issue persists, test or replace the FICM or ECM.

6. Is it safe to drive with the U0105 code on my Saturn?

Driving with the U0105 code is not recommended, as it can result in poor engine performance, misfires, or even a no-start condition, potentially leaving you stranded.

7. How do I diagnose the U0105 code on a Saturn?

Use a scan tool to confirm the code and check for other related codes. Perform a visual inspection of wiring, test the FICM voltage, and verify continuity in the communication circuit.

8. Can a software issue cause the U0105 code on a Saturn?

Yes, outdated or corrupted software in the ECM or FICM can lead to communication issues. Reflashing or updating the modules may resolve the problem.

9. What tools are needed to troubleshoot the U0105 code?

Youâ€™ll need a diagnostic scan tool, a multimeter, and potentially wiring diagrams specific to your Saturn model for troubleshooting.

10. How much does it cost to fix the U0105 code on a Saturn?

Repair costs can vary, typically ranging from $50 to $200 for wiring repairs, while FICM or ECM replacement could cost $500 to $1,500 depending on parts and labor.