AutoCodes – Generic – U0005

U0005 Code - High Speed CAN Communication Bus (+) 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: U0005 indicates High Speed CAN Communication Bus (+) 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 7,974

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 U0005 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 U0005 - High Speed CAN Communication Bus (+) High - AutoCodes.com — U0005 Code - High Speed CAN Communication Bus (+) High

What does this mean?

What are the Possible Causes of the DTC U0005?

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 U0005?

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 U0005 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 U0005 code?

Need more information on how to fix the U0005 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0005 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0005 Ford — High Speed CAN Communication Bus (+) High
U0005 Lincoln — High Speed CAN Communication Bus (+) High
U0005 Mercury — High Speed CAN Communication Bus (+) High

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 U0005 Code

1. What are common symptoms of OBDII code U0005?

- Common symptoms include issues with the vehicle's communication system, such as difficulty starting the engine, reduced performance, and illuminated warning lights on the dashboard.

2. What does OBDII code U0005 indicate?

- OBDII code U0005 indicates a problem with the High Speed CAN Communication Bus (+) High in the vehicle's network.

3. What are the possible causes of OBDII code U0005?

- Possible causes of U0005 include wiring issues, loose connections, faulty control modules, or a malfunctioning CAN bus system.

4. How can I diagnose OBDII code U0005?

- Diagnosing U0005 may require using a scan tool to check for other related trouble codes, inspecting the wiring and connections in the CAN bus system, and conducting a thorough system analysis.

5. How can I repair OBDII code U0005?

- Repairing U0005 may involve fixing any damaged wiring or connections, replacing faulty control modules, or addressing issues with the CAN bus system, as identified during diagnosis.

6. Can driving with OBDII code U0005 cause further damage to the vehicle?

- Continuing to drive with U0005 may potentially lead to further communication issues within the vehicle's network, affecting overall performance and safety.

7. Is it safe to reset the OBDII code U0005 without addressing the underlying issue?

- It is not recommended to simply reset the code without addressing the root cause, as the problem may persist and potentially worsen over time.

8. How much does it typically cost to repair OBDII code U0005?

- The cost of repairing U0005 can vary depending on the extent of the issue, the specific repairs needed, and whether any parts require replacement. It is advisable to consult a professional for an accurate estimate.

9. Can OBDII code U0005 be triggered by a dead battery?

- A dead battery can sometimes lead to communication errors in the vehicle's network, potentially triggering code U0005. Ensuring a fully charged battery is a good first step in troubleshooting.

10. Are there any preventive measures to avoid OBDII code U0005 in the future?

- Regular maintenance checks, ensuring proper electrical connections, and addressing any communication system issues promptly can help prevent the recurrence of U0005 in the future.