U007B 2018 GMC Sierra 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 2018 GMC Sierra 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC U007B 2018 GMC Sierra?
- 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 2018 GMC Sierra?
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 2018 GMC Sierra 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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Frequently Asked Questions about U007B 2018 GMC Sierra Code
What does the OBDII code U007B mean on a 2018 GMC Sierra?
U007B indicates an issue with the Control Module Communication High-Speed Extension CAN Bus, typically meaning the CAN bus is off or not functioning properly.
What are the common symptoms of the U007B code on a 2018 GMC Sierra?
Symptoms may include warning lights on the dashboard, communication errors between modules, impaired vehicle functionality, or failure of certain electronic systems.
What causes the U007B code to appear on a 2018 GMC Sierra?
Common causes include damaged wiring, a faulty control module, a loose or corroded connector, or issues with the CAN bus network.
Can a weak battery trigger the U007B code on a 2018 GMC Sierra?
Yes, a weak or failing battery can cause voltage irregularities that disrupt the CAN bus communication and trigger the U007B code.
How do I diagnose the U007B code on my 2018 GMC Sierra?
Start by inspecting the CAN bus wiring and connectors for damage or corrosion. Use a scan tool to test module communication and check for additional related codes.
Is it safe to drive with the U007B code on a 2018 GMC Sierra?
It is not recommended, as the code indicates communication issues that could impair critical vehicle systems, potentially affecting safety or performance.
What tools are needed to troubleshoot the U007B code on a 2018 GMC Sierra?
A diagnostic scan tool with CAN bus communication capabilities, a multimeter for testing circuits, and wiring diagrams specific to the vehicle are essential.
Can updating the software fix the U007B code on a 2018 GMC Sierra?
In some cases, reprogramming or updating the affected modules’ software may resolve communication issues, but physical causes like wiring damage must be addressed first.
How much does it cost to repair the U007B code on a 2018 GMC Sierra?
Repair costs vary based on the issue, ranging from $100 for wiring repairs to $500+ for module replacement and reprogramming.
Can I clear the U007B code without fixing the problem on my 2018 GMC Sierra?
You can clear the code temporarily with a scan tool, but the underlying issue will likely cause the code to return until it is properly repaired.
Discuss the causes and fixes for U007B 2018 GMC Sierra OBDII Code
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