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U0105 Pontiac Code - Lost Communication With Fuel Injector Control Module

Quick Answer

The U0105 diagnostic trouble code (DTC) for Pontiac vehicles indicates that there is a communication problem between the engine control module (ECM) and the fuel injector control module (FICM). Common causes include Faulty wiring or connectors between the ECM and FICM, Malfunctioning FICM, ECM software issues. 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 Pontiac indicates Lost Communication With Fuel Injector Control Module.
Common causes
Common causes include Faulty wiring or connectors between the ECM and FICM, Malfunctioning FICM, ECM software issues.
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 13, 2024
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Code U0105 Pontiac Description

The U0105 diagnostic trouble code (DTC) for Pontiac vehicles indicates that there is a communication problem between the engine control module (ECM) and the fuel injector control module (FICM). The FICM is responsible for controlling the fuel injectors, which play a crucial role in delivering the right amount of fuel to the engine for combustion. When communication is lost between the ECM and FICM, it can lead to issues with fuel delivery, engine performance, and overall drivability of the vehicle.

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

Common Causes of U0105 Pontiac

  1. Faulty wiring or connectors between the ECM and FICM
  2. Malfunctioning FICM
  3. ECM software issues
  4. Electrical interference or corrosion in the communication circuit
  5. Water intrusion or physical damage to the ECM or FICM

Symptoms of U0105 Pontiac

  1. Engine misfires
  2. Rough idling
  3. Hesitation or lack of power during acceleration
  4. Stalling
  5. Difficulty starting the engine

How to Fix U0105 Pontiac

  1. Begin by inspecting the wiring and connectors between the ECM and FICM for any signs of damage, corrosion, or loose connections.
  2. Test the FICM for proper functionality using a diagnostic scan tool to check for communication errors and voltage levels.
  3. If the FICM is found to be faulty, it may need to be replaced with a new unit.
  4. Clear the DTC from the vehicle's memory using a scan tool after completing the repair to reset the system and ensure proper communication between the ECM and FICM.
  5. Perform a road test to verify that the symptoms associated with the U0105 code have been resolved and that the vehicle is operating correctly.

Cost to Fix U0105 Pontiac

The typical repair costs for addressing a U0105 code on a Pontiac can vary depending on the specific cause of the communication failure. In general, the cost of parts such as a new FICM or wiring harness, along with labor for diagnosis and repair, can range from $200 to $800. It is important to note that labor rates at auto repair shops can vary, with hourly rates typically falling between $80 and $150. Factors such as location, vehicle make and model, and the extent of the repair needed can all impact the final cost. For a more accurate estimate, it is recommended to consult with a local auto repair shop.

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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 Pontiac Code

1. What are common symptoms of OBDII code U0105 in a Pontiac related to lost communication with the fuel injector control module?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and a check engine light.

2. What are possible causes of OBDII code U0105 in a Pontiac?

- Possible causes include a faulty fuel injector control module, damaged wiring or connectors, a blown fuse, or a communication network issue.

3. How can I diagnose the root cause of OBDII code U0105 in my Pontiac?

- Start by checking the wiring and connectors for any damage, test the fuel injector control module for functionality, and scan the vehicle's network for communication errors.

4. Can I still drive my Pontiac with OBDII code U0105 present?

- It is not recommended to drive the vehicle with this issue as it can lead to further damage and potential safety hazards. Have the problem diagnosed and repaired as soon as possible.

5. Is it possible to reset OBDII code U0105 in a Pontiac without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear until the root cause is addressed. Resetting the code without fixing the problem is not a permanent solution.

6. How much does it typically cost to repair OBDII code U0105 in a Pontiac?

- Repair costs can vary depending on the exact cause of the issue, but it may range from $100 for simple fixes like replacing a fuse to $500 or more for more complex repairs involving module replacement.

7. Can I repair OBDII code U0105 in my Pontiac myself, or should I take it to a professional mechanic?

- If you have experience with automotive diagnostics and repair, you may be able to address the issue yourself. Otherwise, it is recommended to seek the help of a professional mechanic for an accurate diagnosis and proper repair.

8. Are there any preventative measures I can take to avoid OBDII code U0105 in my Pontiac?

- Regular maintenance, such as checking and cleaning connectors, inspecting wiring harnesses, and ensuring proper electrical system function, can help prevent issues leading to this code.

9. Will fixing OBDII code U0105 improve my Pontiac's performance and fuel efficiency?

- Yes, resolving this issue can help restore optimal engine performance, improve fuel efficiency, and prevent potential damage to other components in the vehicle.

10. How long does it typically take to repair OBDII code U0105 in a Pontiac?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. Simple fixes may take an hour or two, while more involved repairs could take several hours or longer.

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