AutoCodes – Ford – U0008 Ford

U0008 Ford Code - High Speed CAN Communication Bus (-) High

Quick Answer

Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. 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: U0008 Ford 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 1,379

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 U0008 Ford Description

Multiplexing is a method of sending 2 or more signals simultaneously over a single circuit. Multiplexing allows 2 or more electronic modules (nodes) to communicate over a twisted wire pair [data (+) and data (-)] network. The information or messages that can be communicated on these wires consists of commands, status or data. Multiplexing reduces the weight of the vehicle by reducing the number of redundant components and electrical wiring. The vehicle has 4 module communication networks connected to the DLC, located under the instrument panel. The communication networks are: HEV High Speed Controller Area Network (HS-CAN), High Speed Controller Area Network (HS-CAN), Medium Speed Controller Area Network (MS-CAN) and Infotainment Controller Area Network (I-CAN). The Diagnostic Trouble Code (DTC) U0008 sets when a High Speed Controller Area Network (HS-CAN) fault was present at a point in time. The fault is not currently present since the module is communicating with the scan tool.

OBDII Code U0008 Ford - High Speed CAN Communication Bus (-) High - AutoCodes.com — U0008 Ford Code - High Speed CAN Communication Bus (-) High

What does this mean?

What are the Possible Causes of the DTC U0008 Ford?

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 U0008 Ford?

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 U0008 Ford 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 U0008 Ford code?

Need more information on how to fix the U0008 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0008 Ford 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 U0008 Ford Code

1. What are common symptoms of OBDII code U0008 in a Ford vehicle?

- Common symptoms include issues with the vehicle's transmission, communication errors between modules, and potential warning lights on the dashboard.

2. What does the U0008 code "High Speed CAN Communication Bus (-) High" mean in a Ford?

- This code indicates a problem with the high-speed Controller Area Network (CAN) communication bus, specifically related to a high voltage on the negative side.

3. What are possible causes of the U0008 code in a Ford?

- Common causes include wiring issues, faulty CAN bus modules, loose connections, water damage, or issues with the powertrain control module (PCM).

4. How can I diagnose the U0008 code in my Ford vehicle?

- Diagnosis typically involves checking the wiring connections, inspecting the CAN bus modules, performing a voltage check, and using a scan tool to monitor communication between modules.

5. Can I drive my Ford with the U0008 code present?

- It is not recommended to drive the vehicle with the U0008 code present, as it can lead to further communication issues between critical vehicle systems.

6. How can I repair the U0008 code in my Ford?

- Repair options may include fixing wiring issues, replacing faulty modules, ensuring proper connections, and resetting the fault code using a scan tool after the repair is completed.

7. Is the U0008 code a serious issue in a Ford vehicle?

- Yes, the U0008 code can be a serious issue as it affects the communication between vital vehicle modules, potentially leading to performance issues or safety concerns.

8. Can a DIY enthusiast fix the U0008 code in a Ford?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the U0008 code may require advanced knowledge and specialized tools, so professional help is often recommended.

9. How much does it cost to repair the U0008 code in a Ford at a dealership?

- Repair costs for the U0008 code can vary depending on the specific issue, but it may range from a few hundred to over a thousand dollars at a dealership, including parts and labor.

10. How long does it take to fix the U0008 code in a Ford?

- The repair time for the U0008 code can vary based on the exact cause of the issue, but it may take a few hours to a full day for a trained mechanic to diagnose and repair the problem effectively.