AutoCodes – Pontiac – U0105 Pontiac

U0105 Pontiac 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 Pontiac 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 434

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 06, 2021

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

What does this mean?

What are the Possible Causes of the DTC U0105 Pontiac?

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 Pontiac?

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 Pontiac 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 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.