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Engine-Codes – Generic – U007C

U007C Code - Control Module Communication High Speed Extension CAN Bus 2 Off

Quick Answer

The U007C code indicates a problem with the communication between the control modules in the vehicle through the High Speed Extension Controller Area Network (CAN) Bus 2. Common causes include Faulty wiring or connectors related to the High Speed Extension CAN Bus 2, Malfunctioning control module connected to the network (ECM, TCM, BCM), Water or corrosion damage to the wiring. 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 indicates Control Module Communication High Speed Extension CAN Bus 2 Off.
Common causes
Common causes include Faulty wiring or connectors related to the High Speed Extension CAN Bus 2, Malfunctioning control module connected to the network (ECM, TCM, BCM), Water or corrosion damage to the wiring.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code U007C Description

The U007C code indicates a problem with the communication between the control modules in the vehicle through the High Speed Extension Controller Area Network (CAN) Bus 2. This communication network allows various control modules in the vehicle to exchange information and work together to ensure proper vehicle operation. When this communication is disrupted or lost, it can lead to issues with the vehicle's performance and functionality.

OBDII Code U007C - Control Module Communication High Speed Extension CAN Bus 2 Off
U007C Code - Control Module Communication High Speed Extension CAN Bus 2 Off

Common Causes of U007C

  1. Faulty wiring or connectors related to the High Speed Extension CAN Bus 2
  2. Malfunctioning control module connected to the network (ECM, TCM, BCM)
  3. Water or corrosion damage to the wiring
  4. Electrical interference from aftermarket accessories
  5. Software glitches or communication errors within the control modules

Symptoms of U007C

  1. Engine misfires or rough idling
  2. Transmission shifting issues
  3. ABS brake system malfunctions
  4. Airbag warning lights
  5. Reduced vehicle performance

How to Fix U007C

  1. Begin by performing a thorough inspection of the wiring and connectors related to the High Speed Extension CAN Bus 2. Repair or replace any damaged components.
  2. Use a diagnostic scan tool to identify the specific control module causing the communication issue. Test the module for proper functioning and replace if necessary.
  3. Clear the fault codes from the vehicle's system and perform a reset to re-establish communication between the control modules.
  4. Test drive the vehicle to ensure that the symptoms associated with the code have been resolved.
  5. If the issue persists, consult a professional mechanic or dealership for further troubleshooting and repairs.

Cost to Fix U007C

The cost of repairing the U007C code can vary depending on the specific cause of the communication issue. In general, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to obtain a detailed estimate from a reputable repair shop before proceeding with the repairs.

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Code U007C Information for Specific Makes

  • U007C Buick — Control Module Communication High Speed Extension CAN Bus 2 Off
  • U007C Cadillac — Control Module Communication High Speed Extension CAN Bus 2 Off
  • U007C Chevrolet — Control Module Communication High Speed Extension CAN Bus 2 Off
  • U007C GMC — Control Module Communication High Speed Extension CAN Bus 2 Off
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U007C Code

1. What are common symptoms of OBDII code U007C?

- Common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, issues with vehicle communication systems, and potential difficulty shifting gears.

2. What causes OBDII code U007C to trigger?

- This code is typically triggered when there is a communication failure between control modules on the high-speed CAN bus 2 network, indicating a potential issue with the network wiring, connectors, or modules themselves.

3. How can I diagnose the cause of OBDII code U007C?

- Diagnosis involves checking the wiring and connectors related to the high-speed CAN bus 2 network, inspecting the control modules for faults, and using a diagnostic scanner to analyze communication signals.

4. What are the possible repair options for OBDII code U007C?

- Repair options may include repairing or replacing damaged wiring and connectors, reprogramming or replacing control modules, and ensuring proper communication network functionality.

5. Can I drive my vehicle with OBDII code U007C present?

- It is not recommended to drive the vehicle with this code present, as it can affect critical communication between control modules and potentially lead to further issues with vehicle operation.

6. How serious is OBDII code U007C?

- While the severity of this code may vary depending on the underlying cause, it is considered a serious issue that can impact the overall functionality and safety of the vehicle.

7. Is OBDII code U007C easy to fix on my own?

- Fixing this code may require advanced diagnostic tools and knowledge of vehicle communication systems, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

8. Can a faulty sensor cause OBDII code U007C to appear?

- While a faulty sensor may not directly cause this code, it can contribute to communication issues between control modules, potentially leading to the triggering of code U007C.

9. Does weather or environmental conditions affect OBDII code U007C?

- Extreme weather conditions or environmental factors can potentially impact the high-speed CAN bus 2 network, leading to communication failures and the triggering of code U007C.

10. How much does it typically cost to repair OBDII code U007C?

- Repair costs for this code can vary depending on the specific cause and required repairs, but it is advisable to budget for diagnostic fees, parts replacement, and labor costs.

1. What are the common symptoms of OBDII code U007C?

- Common symptoms include issues with the vehicle's communication system, such as difficulty starting the vehicle, loss of power, or warning lights on the dashboard.

2. What can cause the OBDII code U007C to appear?

- The code U007C is typically triggered by a malfunction in the high-speed communication network between control modules, often due to wiring issues, faulty modules, or a damaged CAN bus.

3. How can I diagnose the OBDII code U007C?

- Diagnosing code U007C involves using a diagnostic scanner to read the trouble codes, checking for any related codes or communication errors, inspecting the wiring harness for damage, and testing the control modules for proper function.

4. What are some possible repair tips for resolving code U007C?

- Repair tips may include repairing or replacing damaged wiring, ensuring proper connections between control modules, updating software or firmware in affected modules, and resetting the codes after the repairs are completed.

5. Can code U007C be fixed by resetting the vehicle's computer?

- While resetting the vehicle's computer may temporarily clear the code U007C, it is important to address the underlying issue causing the communication error to prevent the code from reappearing.

6. Is it safe to drive with the OBDII code U007C present?

- It is not recommended to drive with the code U007C present, as it can indicate potential issues with the vehicle's communication system that may affect its performance or safety.

7. How much does it typically cost to repair OBDII code U007C?

- The cost of repairing code U007C can vary depending on the underlying cause of the issue, but it may involve diagnostic fees, labor costs for repairs, and potential replacement of control modules or wiring components.

8. Can a DIY enthusiast fix OBDII code U007C at home?

- DIY enthusiasts with experience in automotive diagnostics and electrical systems may be able to diagnose and repair code U007C at home, but it is recommended to have the necessary tools and knowledge to avoid causing further damage.

9. Are there any recalls or technical service bulletins related to OBDII code U007C?

- It is advisable to check with the vehicle manufacturer or a trusted automotive service provider to inquire about any recalls or technical service bulletins related to OBDII code U007C for specific vehicle models.

10. How can I prevent OBDII code U007C from recurring in the future?

- To prevent code U007C from recurring, it is important to address any underlying issues promptly, perform regular maintenance checks on the vehicle's communication system, and follow manufacturer recommendations for software updates and inspections.

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