AutoCodes – Generic – U0006

U0006 Code - High Speed CAN Communication Bus (-) Open

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: U0006 indicates High Speed CAN Communication Bus (-) Open.
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 12,614

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 U0006 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 U0006 - High Speed CAN Communication Bus (-) Open - AutoCodes.com — U0006 Code - High Speed CAN Communication Bus (-) Open

What does this mean?

What are the Possible Causes of the DTC U0006?

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 U0006?

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 U0006 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 U0006 code?

Need more information on how to fix the U0006 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0006 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 U0006 Code

1. What are the common symptoms of OBDII code U0006 (High Speed CAN Communication Bus (-) Open)?

- Common symptoms include issues with the vehicle's communication systems, such as loss of communication with various control modules, intermittent electrical problems, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U0006?

- The code U0006 can be triggered by a loose or damaged wiring harness, a faulty CAN bus (-) circuit, a disconnected ground connection, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code U0006?

- Diagnosing code U0006 involves inspecting the wiring harness for any visible damage, checking the ground connections for corrosion or looseness, and using a multimeter to test the continuity of the CAN bus (-) circuit.

4. Can OBDII code U0006 be triggered by a loose electrical connection?

- Yes, a loose electrical connection in the CAN bus (-) circuit can trigger code U0006, causing communication issues between control modules in the vehicle.

5. What are some repair tips for fixing OBDII code U0006?

- Repair tips for code U0006 may include repairing or replacing damaged wiring, securing loose connections, cleaning corroded ground connections, and resetting the fault codes using a diagnostic scanner.

6. Is it safe to drive with OBDII code U0006 active?

- It is generally not recommended to drive with code U0006 active, as it can lead to potential communication failures between critical control modules in the vehicle, affecting the overall performance and safety.

7. Can a DIY enthusiast fix OBDII code U0006 at home?

- Depending on the underlying cause, DIY enthusiasts with knowledge of automotive electrical systems may be able to address code U0006 by inspecting and repairing wiring issues or loose connections.

8. How much does it typically cost to repair OBDII code U0006 at a professional auto repair shop?

- The cost to repair code U0006 at a professional auto repair shop can vary based on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Will disconnecting the vehicle's battery reset OBDII code U0006?

- Disconnecting the battery may temporarily clear the fault code, but if the underlying issue causing code U0006 is not addressed, the code is likely to reappear once the vehicle is driven and the system performs a self-check.

10. How can a mechanic determine if the control modules are causing OBDII code U0006?

- A mechanic can use a diagnostic scanner to communicate with the control modules in the vehicle and monitor the data on the CAN bus (-) circuit to determine if any control modules are not responding or causing communication errors triggering code U0006.