U007B 2018 Chevrolet Silverado Code - Control Module Communication High Speed Extension CAN Bus Off
Quick Answer
The U007B diagnostic trouble code (DTC) in a 2018 Chevrolet Silverado indicates a problem with the Control Module Communication High Speed Extension CAN Bus. Common causes include Damaged wiring harnesses, Loose or corroded connections, Faulty control modules. 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 2018 Chevrolet Silverado indicates Control Module Communication High Speed Extension CAN Bus Off.
- Common causes
- Common causes include Damaged wiring harnesses, Loose or corroded connections, Faulty control modules.
- 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 2018 Chevrolet Silverado Description
The U007B diagnostic trouble code (DTC) in a 2018 Chevrolet Silverado indicates a problem with the Control Module Communication High Speed Extension CAN Bus. The Controller Area Network (CAN) bus is a communication network that allows various modules in the vehicle to communicate with each other. When the high-speed extension of the CAN bus is off, it means that there is a disruption in the communication between control modules, which can lead to various issues in the vehicle's systems.
Common Causes of U007B 2018 Chevrolet Silverado
- Damaged wiring harnesses
- Loose or corroded connections
- Faulty control modules
- Issues with the CAN bus network
- Water or moisture intrusion causing electrical issues
Symptoms of U007B 2018 Chevrolet Silverado
- Check engine light illuminated
- Engine running rough or misfiring
- Transmission shifting erratically
- ABS warning light on
- Loss of communication with certain modules
How to Fix U007B 2018 Chevrolet Silverado
- Perform a thorough inspection of the wiring harnesses and connections for any damage or corrosion.
- Check and test the control modules involved in the communication network.
- Use a diagnostic scan tool to identify the specific module or area causing the communication issue.
- Repair or replace any damaged wiring, connectors, or control modules as needed.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix U007B 2018 Chevrolet Silverado
The typical repair costs for addressing the U007B code in a 2018 Chevrolet Silverado can vary depending on the extent of the issue and the specific repairs needed. In general, the cost can range from $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. It's recommended to check with local shops for a more accurate estimate.
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Frequently Asked Questions about U007B 2018 Chevrolet Silverado Code
What does the OBDII code U007B mean on a 2018 Chevrolet Silverado?
The U007B code indicates a communication issue on the High-Speed Extension Controller Area Network (CAN) bus, meaning one or more control modules cannot communicate properly.
What are the common symptoms of the U007B code?
Symptoms may include warning lights on the dashboard (e.g., check engine, ABS), reduced vehicle performance, erratic behavior of electronic systems, or no-start conditions.
What causes the U007B code in a 2018 Chevrolet Silverado?
Common causes include damaged wiring or connectors in the CAN bus, faulty control modules, a failed communication gateway, or electrical interference from aftermarket accessories.
How can I diagnose the U007B code on my Silverado?
Start by inspecting the CAN bus wiring and connectors for damage or corrosion. Use a scan tool to check for additional codes and monitor the communication network for faults.
Can the U007B code be triggered by a dead battery?
Yes, a weak or dead battery, or sudden power loss, can disrupt communication between modules and trigger the U007B code.
Is it safe to drive with the U007B code active?
Driving may be unsafe as the code can affect critical systems like ABS, traction control, or engine performance. It’s best to diagnose and repair the issue promptly.
How do I fix the U007B code in a 2018 Chevrolet Silverado?
Repairs may involve fixing or replacing damaged CAN bus wiring, addressing faulty control modules, ensuring all connections are secure, or reprogramming affected modules.
Could aftermarket modifications cause the U007B code?
Yes, improperly installed aftermarket accessories or devices that interfere with the CAN bus can cause communication issues leading to the U007B code.
Can a software update fix the U007B code?
In some cases, updating the software for the affected control module(s) via the dealership may resolve communication issues if the problem is software-related.
How much does it cost to repair the U007B code on a Silverado?
Repair costs vary depending on the cause, ranging from $50 for minor wiring fixes to $1,000 or more for replacing and reprogramming control modules.
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