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AutoCodes – Generic – U0105

U0105 Code - Lost Communication With Fuel Injector Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. 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 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 36,751
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 30, 2020
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Code U0105 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Fuel Injector Control Module has not been received.
OBDII Code U0105 - Lost Communication With Fuel Injector Control Module - AutoCodes.com
U0105 Code - Lost Communication With Fuel Injector Control Module
What does this mean?

What are the Possible Causes of the DTC U0105?

  • 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?

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 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 code?

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

Need Help with the Code?

Get the U0105 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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 Code

What does the OBDII code U0105 mean?

The U0105 code indicates a loss of communication between the vehicle's Powertrain Control Module (PCM) and the Fuel Injector Control Module (FICM).

What are the common symptoms of the U0105 code?

Common symptoms include poor engine performance, misfires, difficulty starting, reduced fuel efficiency, and the Check Engine Light being illuminated.

What causes the U0105 code to appear?

Causes can include a faulty Fuel Injector Control Module, damaged wiring or connectors, a blown fuse, or a software issue in the PCM or FICM.

Can a weak battery cause the U0105 code?

Yes, low battery voltage or poor electrical connections can disrupt communication between the PCM and FICM, triggering the U0105 code.

How is the U0105 code diagnosed?

Technicians typically use a scan tool to check for related codes, inspect wiring and connectors, test the FICM, and verify proper power and ground connections.

Can I drive with the U0105 code?

Driving with the U0105 code is not recommended, as it can lead to engine performance problems and potential damage to other components.

How do I fix the U0105 code?

Repairs may involve replacing or repairing damaged wiring, cleaning or securing connectors, reprogramming the PCM or FICM, or replacing the faulty FICM.

Is the U0105 code specific to certain vehicles?

While the U0105 code is a generic OBDII code, its specific causes and repair steps may vary depending on the make and model of the vehicle.

Will clearing the U0105 code fix the problem?

Clearing the code may turn off the Check Engine Light temporarily, but it won’t resolve the underlying issue causing the loss of communication.

How much does it cost to repair the U0105 code?

Repair costs depend on the cause, ranging from $50 for a simple wiring repair to over $1,000 if the FICM needs replacement.

Discuss the causes and fixes for U0105 OBDII Code

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