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Engine-Codes – Generic – U007F

U007F Code - Control Module Communication FlexRay 1B Bus Off

Quick Answer

The U007F code indicates an issue with the Control Module Communication FlexRay 1B Bus, specifically that it is off. Common causes include Damaged wiring or connectors in the FlexRay network, Faulty control module, Software glitches. 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
U007F indicates Control Module Communication FlexRay 1B Bus Off.
Common causes
Common causes include Damaged wiring or connectors in the FlexRay network, Faulty control module, Software glitches.
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 09, 2024
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Code U007F Description

The U007F code indicates an issue with the Control Module Communication FlexRay 1B Bus, specifically that it is off. The FlexRay bus is a high-speed communication network used by various control modules within the vehicle to exchange data and commands. When the Control Module Communication FlexRay 1B Bus is off, it means that communication between certain modules has been disrupted or lost.

OBDII Code U007F - Control Module Communication FlexRay 1B Bus Off
U007F Code - Control Module Communication FlexRay 1B Bus Off

Common Causes of U007F

  1. Damaged wiring or connectors in the FlexRay network
  2. Faulty control module
  3. Software glitches
  4. Water damage causing a short circuit
  5. Electrical interference

Symptoms of U007F

  1. Engine misfires
  2. Transmission shifting issues
  3. Dashboard warning lights illuminated
  4. Loss of power
  5. Vehicle going into limp mode

How to Fix U007F

  1. Perform a comprehensive inspection of the FlexRay network, checking for damaged wiring or connectors.
  2. Test the control modules for proper functionality and replace any faulty modules.
  3. Update the software of the affected modules to the latest version.
  4. Dry out any water-damaged areas and repair any short circuits.
  5. Install additional shielding or filters to prevent electrical interference.

Cost to Fix U007F

The typical repair costs for addressing the U007F code can range from $200 to $800, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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Code U007F 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 U007F Code

1. What does the OBDII code U007F mean?

U007F indicates that the Control Module Communication FlexRay 1B Bus is "off," meaning the vehicle's FlexRay network has lost communication, affecting data transfer between control modules.

2. What are common symptoms of code U007F?

Symptoms include warning lights on the dash (e.g., check engine light), loss of communication with certain modules, reduced vehicle performance, or malfunctioning electronic systems like ABS or traction control.

3. What causes the U007F code to appear?

Common causes include faulty wiring or connectors in the FlexRay network, a failed control module, a software glitch, or physical damage to the FlexRay bus.

4. How can I diagnose the U007F code?

Start by inspecting the FlexRay wiring and connectors for damage or corrosion, check for any related trouble codes, and use a scan tool to verify communication between modules.

5. Can a blown fuse cause the U007F code?

Yes, a blown fuse related to the control modules or the FlexRay network can disrupt communication and trigger the U007F code.

6. Is it safe to drive with the U007F code?

Driving may be possible, but it’s not recommended as essential systems like safety or performance features could malfunction due to impaired communication between modules.

7. How do you fix the U007F code?

Repairs may involve fixing damaged wiring, replacing faulty connectors, reprogramming or replacing a malfunctioning control module, or clearing the code after addressing the root issue.

8. Can a software update fix the U007F code?

In some cases, a software update for the affected control module(s) may resolve the issue if the code is caused by a communication glitch.

9. How much does it cost to repair the U007F code?

Repair costs vary depending on the issue but may range from $100 for minor wiring repairs to over $1,000 for module replacement and programming.

10. Can a weak battery cause the U007F code?

Yes, a weak or failing battery can disrupt the voltage supply to the FlexRay network, leading to communication errors and triggering the U007F code.

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