U007C GMC Code - Control Module Communication High Speed Extension CAN Bus 2 Off
Quick Answer
The U007C diagnostic trouble code for GMC vehicles signifies an issue with the Control Module Communication High Speed Extension CAN Bus 2. Common causes include Faulty wiring or connectors in the CAN Bus network, Defective control module(s) affecting communication, Water damage or corrosion in the wiring harness. 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
- U007C GMC indicates Control Module Communication High Speed Extension CAN Bus 2 Off.
- Common causes
- Common causes include Faulty wiring or connectors in the CAN Bus network, Defective control module(s) affecting communication, Water damage or corrosion in the wiring harness.
- 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 U007C GMC Description
The U007C diagnostic trouble code for GMC vehicles signifies an issue with the Control Module Communication High Speed Extension CAN Bus 2. This code indicates a communication error between the various control modules in the vehicle that are connected through the high-speed CAN Bus 2 network. The CAN (Controller Area Network) Bus is responsible for facilitating communication between different electronic control units (ECUs) in the vehicle, allowing them to exchange data and commands to ensure proper operation.
Common Causes of U007C GMC
- Faulty wiring or connectors in the CAN Bus network
- Defective control module(s) affecting communication
- Water damage or corrosion in the wiring harness
- Software issues or programming errors in the control modules
- Electrical interference from aftermarket accessories or modifications
Symptoms of U007C GMC
- Check engine light illuminated on the dashboard
- Loss of communication with specific control modules
- Erratic behavior of electronic systems (e.g., power windows, door locks)
- Reduced engine performance or rough idling
- Transmission shifting issues or harsh shifting
How to Fix U007C GMC
- Begin by conducting a thorough inspection of the CAN Bus wiring and connectors to check for any visible damage or corrosion. Repair or replace any faulty components as needed.
- Use a diagnostic scan tool to identify the specific control module(s) that are not communicating properly. Address any issues with these modules, such as reprogramming or replacing them.
- Clear the trouble codes from the vehicle's memory using the scan tool and perform a test drive to verify if the issue has been resolved.
- If the problem persists, consult the vehicle's service manual or seek assistance from a professional technician to diagnose the root cause of the communication error and perform further troubleshooting steps as necessary.
Cost to Fix U007C GMC
The typical repair costs for addressing the U007C code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the repair for this code may range from $200 to $500, including parts and labor. However, it is essential to note that the actual cost can be higher or lower based on factors like the location of the repair shop, the make and model of the vehicle, and the complexity of the repair process. It is recommended to obtain quotes from reputable auto repair shops or dealerships to get a more accurate estimate for resolving this issue.
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Information for Specific GMC Models
- U007C 2014 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
- U007C 2015 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
- U007C 2016 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
- U007C 2017 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
- U007C 2018 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
Frequently Asked Questions about U007C GMC Code
1. What does the OBDII code U007C mean for a GMC vehicle?
The code U007C indicates a communication issue on the high-speed CAN Bus 2 network, meaning one or more control modules are unable to communicate properly.
2. What are the common symptoms of the U007C code in a GMC?
Symptoms can include warning lights on the dashboard (like the check engine light), reduced vehicle performance, erratic transmission behavior, or failure of certain vehicle systems to function.
3. What causes the U007C code to appear on a GMC?
Common causes include a faulty control module, damaged CAN Bus wiring, corroded or loose connectors, or a malfunctioning CAN Bus termination resistor.
4. How is the U007C code diagnosed in a GMC vehicle?
A technician will use a scan tool to check for related codes, inspect the CAN Bus wiring and connectors for damage, and test the communication between modules on the network.
5. Can a weak battery cause the U007C code in a GMC?
Yes, a weak or failing battery can result in insufficient voltage to the control modules, causing communication errors like the U007C code.
6. How do you fix the U007C code on a GMC?
Repairs may involve replacing or repairing damaged wiring, securing loose connectors, replacing a faulty control module, or reprogramming the affected module(s).
7. Is it safe to drive with the U007C code present in a GMC?
It depends on the severity of the issue. If critical systems like steering or brakes are affected, driving may be unsafe. It's best to address the issue promptly.
8. Can the U007C code clear itself on a GMC?
The code may clear temporarily if the issue is intermittent, but it will likely return unless the underlying problem is resolved.
9. How much does it cost to repair the U007C code in a GMC?
Repair costs vary depending on the cause, ranging from $50 for simple wiring fixes to $500 or more for module replacements or reprogramming.
10. Can a software update fix the U007C code in a GMC?
In some cases, a software update for the control module may resolve communication issues, but further diagnosis is required to determine if this is the solution.
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