AutoCodes – Generic – U0041

U0041 Code - Vehicle Communication Bus 'B' (+) High

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module. 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: U0041 indicates Vehicle Communication Bus 'B' (+) High.
Common causes: Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module.
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 4,962

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 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0041 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 supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U0041 - Vehicle Communication Bus 'B' (+) High - AutoCodes.com — U0041 Code - Vehicle Communication Bus 'B' (+) High

What does this mean?

What are the Possible Causes of the DTC U0041?

Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s)
Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0041?

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 U0041 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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Need Help with the Code?

Get the U0041 code diagnosed by a professional: Find a repair shop in your area

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 U0041 Code

1. What are the common symptoms of OBDII code U0041 (Vehicle Communication Bus 'B' (+) High)?

The common symptoms of U0041 may include issues with the vehicle's communication system, such as difficulty starting the vehicle, loss of communication with certain modules, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U0041?

Possible causes of U0041 can include damaged wiring in the communication bus circuit, faulty control modules, corrosion in connectors, or issues with the communication network.

3. How can I diagnose OBDII code U0041?

Diagnosing U0041 typically involves using a professional OBDII scanner to read the code, checking for any additional related codes, inspecting the communication bus wiring, and testing the control modules for proper operation.

4. Can I still drive my vehicle with OBDII code U0041?

It is not recommended to drive your vehicle with an unresolved U0041 code, as it can lead to further communication issues and potential safety concerns.

5. How can I repair OBDII code U0041?

Repairing U0041 may involve repairing or replacing damaged wiring, cleaning corrosion from connectors, replacing faulty control modules, or addressing any issues with the communication network.

6. Are there any DIY tips for fixing OBDII code U0041?

While some basic checks like inspecting wiring and connectors can be done DIY, it is recommended to seek professional help for diagnosing and repairing U0041 to ensure the proper resolution of the issue.

7. Can a low vehicle battery cause OBDII code U0041 to appear?

A low vehicle battery can potentially cause communication issues and trigger U0041, so it's a good idea to ensure the battery is in good condition when troubleshooting this code.

8. How much does it cost to fix OBDII code U0041?

The cost of fixing U0041 can vary depending on the specific cause of the issue, the parts needed for repair, and the labor costs involved. It is advisable to get a professional diagnosis for an accurate estimate.

9. Will resetting the OBDII code U0041 make it go away permanently?

Simply resetting the code may temporarily clear the warning light, but if the underlying issue causing U0041 is not addressed, the code is likely to reappear once the problem is detected again.

10. Is OBDII code U0041 a serious issue that requires immediate attention?

While U0041 may not always result in immediate vehicle breakdown, it is still considered a serious issue that should be addressed promptly to prevent potential communication failures and further complications.