U007B Code - Control Module Communication High Speed Extension CAN 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
- U007B indicates Control Module Communication High Speed Extension CAN 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 U007B Description
What are the Possible Causes of the DTC U007B?
- 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 U007B?
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 U007B 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 U007B code?
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Get the U007B code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- U007B Buick — Control Module Communication High Speed Extension CAN Bus Off
- U007B Cadillac — Control Module Communication High Speed Extension CAN Bus Off
- U007B Chevrolet — Control Module Communication High Speed Extension CAN Bus Off
- U007B GMC — Control Module Communication High Speed Extension CAN Bus Off
Frequently Asked Questions about U007B Code
1. What are the common symptoms of OBDII code U007B?
- Common symptoms include issues with the vehicle's communication network, such as intermittent or total loss of communication between control modules.
2. What can cause the OBDII code U007B to trigger?
- This code can be triggered by a fault in the high-speed extension Controller Area Network (CAN) bus communication system, such as a wiring issue, faulty control module, or a disrupted network connection.
3. How can I diagnose the OBDII code U007B?
- Diagnosing this code typically involves using a professional OBDII scanner to check for communication faults, inspecting the wiring connections, and performing network communication tests among control modules.
4. What repair steps can I take to address the OBDII code U007B?
- Repair steps may include repairing or replacing damaged wiring, checking and reprogramming control modules, and ensuring proper network communication among modules.
5. Can I still drive my vehicle with the OBDII code U007B present?
- It is not recommended to drive the vehicle with this code present, as it can lead to potential safety hazards and affect the performance of various vehicle systems.
6. How much does it typically cost to repair the OBDII code U007B?
- Repair costs for this code can vary depending on the underlying cause of the communication issue, but it is advisable to consult with a professional mechanic for an accurate estimate.
7. Are there any preventative maintenance measures I can take to avoid the OBDII code U007B?
- Regularly checking and maintaining the vehicle's electrical system, including the wiring connections and control modules, can help prevent communication issues that may trigger this code.
8. Will resetting the OBDII code U007B make it go away permanently?
- Resetting the code without addressing the underlying issue will not make it go away permanently. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.
9. Can a DIY enthusiast without professional tools fix the OBDII code U007B?
- While basic troubleshooting like checking wiring connections can be done by a DIY enthusiast, diagnosing and repairing complex communication issues may require professional tools and expertise.
10. How long does it typically take to repair the OBDII code U007B?
- The repair time for this code can vary depending on the specific cause and complexity of the issue. Some repairs may be completed within a few hours, while others may take longer if extensive troubleshooting is required.
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