U007B GMC Code - Control Module Communication High Speed Extension CAN Bus Off
Quick Answer
The U007B GMC code indicates a problem with the Control Module Communication High Speed Extension CAN Bus being turned off. Common causes include Faulty control module, Wiring harness damage or corrosion, Loose or disconnected connectors. 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 GMC indicates Control Module Communication High Speed Extension CAN Bus Off.
- Common causes
- Common causes include Faulty control module, Wiring harness damage or corrosion, Loose or disconnected connectors.
- 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 U007B GMC Description
The U007B GMC code indicates a problem with the Control Module Communication High Speed Extension CAN Bus being turned off. The CAN Bus (Controller Area Network) is a system used in modern vehicles to allow various control modules to communicate with each other. When this communication is disrupted, it can lead to issues with the vehicle's performance and functionality. In this case, the high-speed extension of the CAN Bus being off means that certain modules may not be able to communicate effectively, potentially leading to malfunctions in various systems.
Common Causes of U007B GMC
- Faulty control module
- Wiring harness damage or corrosion
- Loose or disconnected connectors
- Sensor malfunction
- Network communication system failure
Symptoms of U007B GMC
- Check Engine Light illuminated on the dashboard
- Loss of communication with certain control modules
- Erratic behavior of electronic systems (e.g., power windows, door locks)
- Transmission shifting issues
- Reduced fuel efficiency
How to Fix U007B GMC
- Perform a diagnostic scan to retrieve the trouble codes and pinpoint the issue
- Inspect the wiring harness, connectors, and control modules for any visible damage
- Test the high-speed CAN Bus network for proper communication
- Repair or replace any faulty components identified during the diagnostic process
- Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved
Cost to Fix U007B GMC
The typical repair costs for addressing a U007B GMC code can vary depending on the specific cause of the issue. In general, the parts needed for the repair, such as control modules, wiring harnesses, or sensors, can range from $100 to $500 or more. Labor costs at an auto repair shop can add an additional $100 to $300 or more, depending on the shop's hourly rates and the complexity of the repair. Overall, the total cost for resolving this issue could range from $200 to $800 or more. It's recommended to get a detailed estimate from a trusted mechanic or dealership to get a more accurate cost for your specific situation.
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Information for Specific GMC Models
- U007B 2014 GMC Sierra — Control Module Communication High Speed Extension CAN Bus Off
- U007B 2015 GMC Sierra — Control Module Communication High Speed Extension CAN Bus Off
- U007B 2016 GMC Sierra — Control Module Communication High Speed Extension CAN Bus Off
- U007B 2017 GMC Sierra — Control Module Communication High Speed Extension CAN Bus Off
- U007B 2018 GMC Sierra — Control Module Communication High Speed Extension CAN Bus Off
Frequently Asked Questions about U007B GMC Code
1. What are the common symptoms of OBDII code U007B in a GMC vehicle?
The common symptoms of OBDII code U007B include issues with the vehicle's communication system, such as intermittent or complete loss of communication with various control modules.
2. What can cause the OBDII code U007B in a GMC vehicle?
The OBDII code U007B in a GMC vehicle is usually caused by a high-speed communication bus fault, which can be due to issues with wiring, connectors, control modules, or the network itself.
3. How can I diagnose the OBDII code U007B in my GMC vehicle?
Diagnosing the OBDII code U007B typically involves using a professional diagnostic scanner to check for communication faults and inspecting the wiring and connectors for any signs of damage or corrosion.
4. Can I drive my GMC vehicle with the OBDII code U007B present?
It is not recommended to drive your GMC vehicle with the OBDII code U007B present, as it can lead to further communication issues between control modules and potentially affect the vehicle's performance and safety.
5. How can I repair the OBDII code U007B in my GMC vehicle?
Repairing the OBDII code U007B in a GMC vehicle may involve repairing or replacing damaged wiring, connectors, or control modules related to the high-speed communication bus to restore proper communication.
6. Are there any DIY tips for fixing the OBDII code U007B in a GMC vehicle?
While some basic inspections and connector cleanings can be done by DIY enthusiasts, diagnosing and repairing the OBDII code U007B usually requires professional diagnostic equipment and expertise.
7. Is the OBDII code U007B in a GMC vehicle a serious issue?
The OBDII code U007B in a GMC vehicle should be addressed promptly, as it indicates a fault in the communication system that can affect the vehicle's operation and potentially lead to more severe issues if left unresolved.
8. Can a faulty battery or alternator cause the OBDII code U007B in a GMC vehicle?
A faulty battery or alternator can sometimes cause communication issues in a vehicle, but they are less likely to trigger the specific OBDII code U007B related to high-speed communication bus faults.
9. How long does it take to repair the OBDII code U007B in a GMC vehicle?
The time required to repair the OBDII code U007B in a GMC vehicle can vary depending on the extent of the issue and the availability of parts, but it typically takes a few hours to a full day at a professional repair shop.
10. Is it necessary to reset the OBDII code U007B after repairing the issue in a GMC vehicle?
After repairing the issue causing the OBDII code U007B in a GMC vehicle, it is recommended to clear the code using a diagnostic scanner to reset the system and ensure that the repair was successful.
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