U007B 2016 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off
Quick Answer
The U007B diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Control Module Communication High Speed Extension CAN Bus being off. Common causes include Faulty Control Module: A malfunctioning control module responsible for the high-speed CAN bus communication can trigger the U007B code, Wiring Issues: Damaged or corroded wiring connections, harnesses, or connectors within the CAN bus network can disrupt communication, Software Glitch: A software glitch or programming error in one of the control modules can cause communication issues. 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 2016 GMC Sierra indicates Control Module Communication High Speed Extension CAN Bus Off.
- Common causes
- Common causes include Faulty Control Module: A malfunctioning control module responsible for the high-speed CAN bus communication can trigger the U007B code, Wiring Issues: Damaged or corroded wiring connections, harnesses, or connectors within the CAN bus network can disrupt communication, Software Glitch: A software glitch or programming error in one of the control modules can cause communication issues.
- 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 2016 GMC Sierra Description
The U007B diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Control Module Communication High Speed Extension CAN Bus being off. In modern vehicles, the Controller Area Network (CAN) bus is a critical communication network that allows various electronic control modules within the vehicle to communicate with each other. The high-speed CAN bus is responsible for transmitting data rapidly between modules, ensuring smooth operation and coordination of various vehicle functions.
Common Causes of U007B 2016 GMC Sierra
- Faulty Control Module: A malfunctioning control module responsible for the high-speed CAN bus communication can trigger the U007B code.
- Wiring Issues: Damaged or corroded wiring connections, harnesses, or connectors within the CAN bus network can disrupt communication.
- Software Glitch: A software glitch or programming error in one of the control modules can cause communication issues.
- Water Intrusion: Water intrusion into the wiring or connectors of the CAN bus can lead to corrosion and poor connectivity.
- Electrical Interference: External factors like electromagnetic interference from nearby electrical components or aftermarket accessories can interfere with the CAN bus communication.
Symptoms of U007B 2016 GMC Sierra
- Check Engine Light: The most common symptom associated with the U007B code is the illumination of the Check Engine Light on the dashboard.
- Loss of Communication: The vehicle may experience a loss of communication between various control modules, resulting in erratic behavior or malfunction of electronic systems.
- Reduced Performance: The vehicle may exhibit reduced performance, such as decreased acceleration, rough idling, or difficulty shifting gears.
- Unresponsive Controls: Controls like the power windows, door locks, or climate control may become unresponsive or work intermittently.
- Inconsistent Instrument Cluster: The instrument cluster may display incorrect or fluctuating readings, such as speedometer or fuel gauge inaccuracies.
How to Fix U007B 2016 GMC Sierra
- Diagnostic Scan: Use a diagnostic scan tool to retrieve the specific trouble codes, including U007B, and identify the affected control module.
- Inspect Wiring: Check the wiring harnesses, connectors, and terminals for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
- Control Module Replacement: If a faulty control module is identified, replace it with a new or refurbished unit and reprogram if needed.
- Clear Fault Codes: After making repairs, clear the fault codes from the vehicle's memory using the diagnostic scan tool.
- Test Drive and Recheck: Test drive the vehicle to ensure the symptoms have been resolved, and recheck for any remaining fault codes.
Cost to Fix U007B 2016 GMC Sierra
The cost of repairing the U007B code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the repair cost for this type of communication error can range from $200 to $800, including parts and labor. However, it's essential to note that the diagnosis time and labor rates at auto repair shops can fluctuate based on factors such as location, vehicle make and model, and engine type. It's advisable to inquire about local rates to get a more accurate estimate for the repair.
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Frequently Asked Questions about U007B 2016 GMC Sierra Code
1. What are the common symptoms of OBDII code U007B in a 2016 GMC Sierra?
The common symptoms include issues with the vehicle's communication system, such as intermittent or complete loss of communication with various control modules.
2. What does the OBDII code U007B mean for a 2016 GMC Sierra?
The code U007B indicates a problem with the Control Module Communication High Speed Extension CAN Bus Off in the vehicle.
3. What are the possible causes of OBDII code U007B in a 2016 GMC Sierra?
Possible causes include faulty wiring or connections in the high-speed CAN bus network, issues with control modules, or a malfunction in the vehicle's communication system.
4. How can I diagnose the OBDII code U007B in my 2016 GMC Sierra?
Diagnosis typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the wiring and connections in the high-speed CAN bus network, and inspecting the control modules for any signs of damage.
5. Can I drive my 2016 GMC Sierra with the OBDII code U007B present?
It is not recommended to drive the vehicle with this code present, as it can lead to communication errors between critical control modules, potentially affecting the vehicle's performance and safety.
6. How can I repair OBDII code U007B in my 2016 GMC Sierra?
Repairing this code may involve fixing any wiring or connection issues in the high-speed CAN bus network, replacing faulty control modules, or reprogramming the vehicle's communication system as needed.
7. Is it safe to clear the OBDII code U007B in my 2016 GMC Sierra with a scanner?
Clearing the code with a scanner is safe after conducting the necessary repairs to address the underlying issue causing the code. However, if the problem persists, the code may reappear.
8. Can a DIY enthusiast fix OBDII code U007B in a 2016 GMC Sierra?
While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing this code may require specialized tools and expertise, so it is recommended to consult a professional technician.
9. How much does it cost to repair OBDII code U007B in a 2016 GMC Sierra?
The cost of repair can vary depending on the root cause of the issue, the need for replacement parts, and labor charges. It is advisable to get a diagnostic from a qualified mechanic for an accurate estimate.
10. Will OBDII code U007B in a 2016 GMC Sierra affect the vehicle's fuel efficiency?
In some cases, the code U007B can lead to communication errors that may impact the vehicle's performance, potentially affecting fuel efficiency. It's essential to address the issue promptly to avoid any adverse effects on fuel economy.
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