AutoCodes – Cadillac – U0105 Cadillac

U0105 Cadillac 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 Cadillac 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 676

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

What does this mean?

What are the Possible Causes of the DTC U0105 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U0105 in a Cadillac related to lost communication with the Fuel Injector Control Module?

- Common symptoms include engine stalling, rough idling, poor acceleration, and the illumination of the Check Engine Light.

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

- Possible causes may include a faulty Fuel Injector Control Module, damaged wiring or connectors, a blown fuse, or issues with the vehicle's powertrain control module (PCM).

3. How can I diagnose the source of the communication issue with the Fuel Injector Control Module in my Cadillac?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the specific trouble codes, check the wiring and connectors for any damage, and perform a thorough inspection of the module itself.

4. What are some general repair tips for addressing OBDII code U0105 in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the Fuel Injector Control Module if necessary, ensuring proper power supply to the module, and clearing the trouble codes after repairs are completed.

5. Can I continue driving my Cadillac with OBDII code U0105 present?

- It is not recommended to continue driving your Cadillac with this code present, as it can lead to further engine performance issues and potential damage if left unresolved.

6. Are there any safety concerns associated with OBDII code U0105 in a Cadillac?

- While the code itself does not pose an immediate safety risk, the related symptoms such as engine stalling or poor acceleration can impact the vehicle's drivability and should be addressed promptly.

7. How much does it typically cost to repair OBDII code U0105 in a Cadillac?

- The cost of repairs can vary depending on the specific cause of the communication issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast repair OBDII code U0105 in a Cadillac, or is it best left to a professional mechanic?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the underlying cause of the code may require specialized tools and expertise best handled by a professional mechanic.

9. Is there a way to prevent OBDII code U0105 from occurring in my Cadillac in the future?

- Regular maintenance, including checking and maintaining the vehicle's electrical system and connectors, can help prevent communication issues with the Fuel Injector Control Module and other related components.

10. Will resetting the trouble codes on my Cadillac make OBDII code U0105 disappear permanently?

- Resetting the trouble codes may temporarily clear the Check Engine Light, but if the underlying issue causing code U0105 is not addressed, the code is likely to reappear after driving the vehicle.