AutoCodes – Mercury – U0008 Mercury

U0008 Mercury 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 Mercury 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 881

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

What does this mean?

What are the Possible Causes of the DTC U0008 Mercury?

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 Mercury?

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 Mercury 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 Mercury code?

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

Need Help with the Code?

Get the U0008 Mercury 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 Mercury Code

1. What are the common symptoms of OBDII code U0008 on a Mercury?

- Common symptoms may include issues with the vehicle's communication systems, such as loss of communication between modules or erratic behavior of electronic components.

2. What can cause the OBDII code U0008 on a Mercury?

- The code U0008 typically indicates a problem with the High Speed CAN Communication Bus (-) High, which could be caused by wiring issues, faulty modules, or loose connections.

3. How can I diagnose the OBDII code U0008 on my Mercury?

- To diagnose the U0008 code, you can start by checking the wiring connections, inspecting the modules on the High Speed CAN network, and using a diagnostic scan tool to identify the specific area of concern.

4. Is it safe to continue driving with the U0008 code on a Mercury?

- It is not recommended to drive with unresolved communication bus issues, as they can lead to further electrical problems and potential safety hazards. It is best to address the U0008 code promptly.

5. Can I repair the U0008 code on my Mercury myself?

- Depending on your skill level and access to tools, you may be able to address the U0008 code yourself by checking and repairing wiring connections, replacing faulty modules, and ensuring proper communication network functionality.

6. How much does it cost to repair the U0008 code on a Mercury?

- The cost of repairing the U0008 code can vary depending on the root cause of the issue, the extent of the repairs needed, and whether you choose to address it yourself or take it to a professional mechanic. It is advisable to get a diagnosis and estimate from a qualified technician.

7. Will resetting the OBDII code U0008 on my Mercury make it go away permanently?

- Simply resetting the code may temporarily clear the warning light, but if the underlying issue causing the U0008 code is not addressed, it is likely to return. It is important to diagnose and repair the root cause of the problem.

8. Can extreme weather conditions affect the High Speed CAN Communication Bus on a Mercury?

- Extreme weather conditions, such as extreme heat or cold, can potentially affect the High Speed CAN Communication Bus and other electronic components in your Mercury, leading to communication issues and triggering codes like U0008.

9. Are there any recalls related to the U0008 code on Mercury vehicles?

- It is advisable to check with a Mercury dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls related to the U0008 code on your specific Mercury model.

10. How long does it typically take to repair the U0008 code on a Mercury?

- The repair time for the U0008 code can vary depending on the complexity of the issue, the availability of parts, and the expertise of the technician. Simple fixes may take a few hours, while more involved repairs could take longer.