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Engine-Codes – Generic – U0008

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

Quick Answer

The U0008 diagnostic trouble code (DTC) refers to a High Speed CAN Communication Bus (-) High fault. Common causes include Faulty high-speed CAN bus wiring or connectors, Short circuit in the high-speed CAN bus circuit, Malfunctioning control module affecting the high-speed CAN bus. 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 indicates High Speed CAN Communication Bus (-) High.
Common causes
Common causes include Faulty high-speed CAN bus wiring or connectors, Short circuit in the high-speed CAN bus circuit, Malfunctioning control module affecting the high-speed CAN bus.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U0008 Description

The U0008 diagnostic trouble code (DTC) refers to a High Speed CAN Communication Bus (-) High fault. The Controller Area Network (CAN) is a communication system used in modern vehicles to allow various modules and sensors to communicate with each other. The high-speed CAN bus is responsible for transferring critical data between different control modules within the vehicle, such as the engine control module, transmission control module, anti-lock brake system module, airbag module, and more.

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

Common Causes of U0008

  1. Faulty high-speed CAN bus wiring or connectors
  2. Short circuit in the high-speed CAN bus circuit
  3. Malfunctioning control module affecting the high-speed CAN bus
  4. Water intrusion causing corrosion in the CAN bus connections
  5. Electrical interference from aftermarket accessories

Symptoms of U0008

  1. Check engine light illuminated
  2. Loss of communication with various control modules
  3. Erratic behavior of electronic systems (e.g., lights, power windows, HVAC)
  4. Transmission shifting problems
  5. Loss of power steering assist

How to Fix U0008

  1. Inspect the high-speed CAN bus wiring and connectors for damage or corrosion. Repair or replace as necessary.
  2. Check for any short circuits in the high-speed CAN bus circuit and repair the wiring if needed.
  3. Scan all control modules for communication faults and address any malfunctions or reprogram as necessary.
  4. Inspect for water intrusion in the CAN bus connections and seal any leaks to prevent further damage.
  5. Remove any aftermarket accessories that may be causing electrical interference with the high-speed CAN bus.

Cost to Fix U0008

The cost of repairing a U0008 DTC can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the repair for this code may range from $200 to $500, including parts and labor. It's important to note that diagnosis time and labor rates can vary, so it's recommended to obtain a detailed quote from a trusted mechanic or dealership before proceeding with the repair.

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Code U0008 Information for Specific Makes

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 Code

1. What are the common symptoms of OBDII code U0008 (High Speed CAN Communication Bus (-) High)?

Symptoms may include issues with the vehicle's network communication system, such as intermittent or complete loss of communication between control modules.

2. What can cause OBDII code U0008 to trigger?

This code may be triggered by damaged or faulty wiring, connectors, or control modules within the high-speed CAN communication network.

3. How can I diagnose the underlying cause of OBDII code U0008?

Diagnosis typically involves inspecting the wiring harness, connectors, and control modules associated with the high-speed CAN bus for any signs of damage, corrosion, or loose connections.

4. Is it safe to continue driving with OBDII code U0008 present?

It is not recommended to drive the vehicle with this code present, as it may lead to further communication issues between critical control modules.

5. How can I repair OBDII code U0008?

Repairing this code often involves repairing or replacing damaged wiring, connectors, or control modules within the high-speed CAN network.

6. Can a DIY enthusiast fix OBDII code U0008 at home?

While some basic troubleshooting steps can be performed at home, diagnosing and repairing this code may require advanced diagnostic tools and expertise, making it more suitable for professional technicians.

7. What are the potential consequences of ignoring OBDII code U0008?

Ignoring this code may lead to further electrical communication issues within the vehicle, potentially impacting its overall performance and safety.

8. How much does it typically cost to repair OBDII code U0008?

The cost of repairing this code can vary depending on the extent of the damage and the specific components that need to be repaired or replaced. It is advisable to consult with a professional technician for an accurate estimate.

9. Can extreme weather conditions contribute to triggering OBDII code U0008?

Yes, extreme weather conditions, such as excessive heat or moisture, can potentially damage the wiring or connectors associated with the high-speed CAN communication network, leading to the triggering of this code.

10. Is OBDII code U0008 a common issue in specific vehicle makes or models?

This code can occur in various vehicle makes and models that are equipped with a high-speed CAN communication network. However, some models may have a higher incidence of this issue due to specific design or manufacturing factors.

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