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U0105 Saturn Code - Lost Communication With Fuel Injector Control Module

Quick Answer

The U0105 diagnostic trouble code (DTC) for Saturn vehicles indicates that the engine control module (ECM) has lost communication with the fuel injector control module (FICM). Common causes include Damaged wiring or connectors between ECM and FICM, Faulty FICM, Malfunctioning ECM. 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 Damaged wiring or connectors between ECM and FICM, Faulty FICM, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U0105 Saturn Description

The U0105 diagnostic trouble code (DTC) for Saturn vehicles indicates that the engine control module (ECM) has lost communication with the fuel injector control module (FICM). The FICM is responsible for controlling the fuel injectors in the engine, ensuring that the correct amount of fuel is delivered at the right time for combustion. When communication between the ECM and FICM is lost, it can lead to a variety of issues that affect the vehicle's performance.

OBDII Code U0105 Saturn - Lost Communication With Fuel Injector Control Module
U0105 Saturn Code - Lost Communication With Fuel Injector Control Module

Common Causes of U0105 Saturn

  1. Damaged wiring or connectors between ECM and FICM
  2. Faulty FICM
  3. Malfunctioning ECM
  4. Software glitches in control modules

Symptoms of U0105 Saturn

  1. Poor fuel economy
  2. Rough idling or stalling
  3. Misfires
  4. Lack of power during acceleration
  5. Check Engine Light illuminated

How to Fix U0105 Saturn

  1. Perform a thorough inspection of wiring and connectors between ECM and FICM
  2. Test FICM for functionality and replace if necessary
  3. Scan ECM for software glitches and update as needed
  4. Clear the DTC and perform a test drive to ensure proper communication between modules
  5. Address any additional issues identified during the diagnostic process

Cost to Fix U0105 Saturn

The cost of repairing a U0105 code on a Saturn vehicle can vary depending on the specific cause of the communication failure and the required repairs. On average, the cost of parts and labor for this issue can range from $200 to $500. However, it's important to note that labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's recommended to contact local auto repair shops for a more accurate estimate of the repair costs.

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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 vehicle’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?

You’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.

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