AutoCodes – Generic – U0001

U0001 Code - High Speed CAN Communication Bus

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: U0001 indicates High Speed CAN Communication Bus.
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 45,815

How popular is this code, among other codes? Medium

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 U0001 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 U0001 - High Speed CAN Communication Bus - AutoCodes.com — U0001 Code - High Speed CAN Communication Bus

What does this mean?

What are the Possible Causes of the DTC U0001?

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 U0001?

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 U0001 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 U0001 code?

Need more information on how to fix the U0001 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0001 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0001 Buick — High Speed CAN Communication Bus Malfunction
U0001 Cadillac — High Speed CAN Communication Bus Malfunction
U0001 Chevrolet — High Speed CAN Communication Bus Malfunction
U0001 Chrysler — CAN Communication Bus Circuit
U0001 Dodge — CAN Communication Bus Circuit
U0001 Ford — High Speed CAN Communication Bus
U0001 GMC — High Speed CAN Communication Bus Malfunction
U0001 Jeep — CAN Communication Bus Circuit
U0001 Lincoln — High Speed CAN Communication Bus
U0001 Mercury — High Speed CAN Communication Bus
U0001 RAM — CAN Communication Bus Circuit

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 U0001 Code

1. What does the OBDII code U0001 mean?

The U0001 code refers to a communication issue in the High Speed CAN Communication Bus in the vehicle's network.

2. What are the common symptoms of a U0001 code?

Common symptoms include problems with the vehicle's network communication, such as issues with various electronic control modules not being able to communicate properly.

3. What are the possible causes of a U0001 code?

Potential causes include wiring issues, faulty control modules, loose connections, or a problem with the High Speed CAN Communication Bus itself.

4. How do I diagnose a U0001 code?

Diagnosis involves checking the wiring connections, inspecting the control modules, and using a diagnostic scanner to identify the specific area of the communication breakdown.

5. How can I repair a U0001 code?

Repair options include fixing any damaged wiring, replacing faulty control modules, ensuring secure connections, and resetting the communication network.

6. Can a U0001 code cause other issues in the vehicle?

Yes, a U0001 code can lead to various other problems in the vehicle, such as issues with transmission shifting, ABS functionality, or engine performance.

7. Is it safe to drive with a U0001 code?

It is not recommended to drive with a U0001 code present, as it can affect the proper communication between critical systems in the vehicle.

8. How much does it typically cost to repair a U0001 code?

The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a U0001 code be intermittent?

Yes, a U0001 code can sometimes be intermittent, which can make diagnosis and repair more challenging. It is important to address the issue promptly to prevent further complications.

10. Will resetting the U0001 code make it go away permanently?

Simply clearing the code without addressing the underlying issue will not fix the problem permanently. It is essential to diagnose and repair the root cause of the U0001 code for a lasting solution.