U007F Code - Control Module Communication FlexRay 1B Bus Off
Quick Answer
The devices connected to the object high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Check for more codes, Faulty Control Module, Control Module harness is open or shorted. 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 Check for more codes, Faulty Control Module, Control Module harness is open or shorted.
- 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.
Code U007F Description
What are the Possible Causes of the DTC U007F?
- 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 U007F?
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 U007F 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.
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Information for Specific Makes
- U007F Buick — Control Module Communication FlexRay 1B Bus Off
- U007F Cadillac — Control Module Communication FlexRay 1B Bus Off
- U007F Chevrolet — Control Module Communication FlexRay 1B Bus Off
- U007F GMC — Control Module Communication FlexRay 1B Bus Off
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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