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U0078 2017 Chevrolet Silverado Code - Control Module Communication Low Speed CAN Bus Off

Quick Answer

The U0078 code on a 2017 Chevrolet Silverado indicates a problem with the Control Module Communication Low Speed CAN Bus. Common causes include Faulty control module, Wiring or connection issues in the CAN bus network, Corrosion or damage to connectors or terminals. 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
U0078 2017 Chevrolet Silverado indicates Control Module Communication Low Speed CAN Bus Off.
Common causes
Common causes include Faulty control module, Wiring or connection issues in the CAN bus network, Corrosion or damage to connectors or terminals.
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 16, 2024
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Code U0078 2017 Chevrolet Silverado Description

The U0078 code on a 2017 Chevrolet Silverado indicates a problem with the Control Module Communication Low Speed CAN Bus. The Controller Area Network (CAN) bus is a communication network that allows various modules in the vehicle to communicate with each other. The low-speed CAN bus is responsible for transmitting data between modules at a lower speed than the high-speed CAN bus.

OBDII Code U0078 2017 Chevrolet Silverado - Control Module Communication Low Speed CAN Bus Off
U0078 2017 Chevrolet Silverado Code - Control Module Communication Low Speed CAN Bus Off

Common Causes of U0078 2017 Chevrolet Silverado

  1. Faulty control module
  2. Wiring or connection issues in the CAN bus network
  3. Corrosion or damage to connectors or terminals
  4. Software glitches or updates
  5. Electrical interference from aftermarket accessories

Symptoms of U0078 2017 Chevrolet Silverado

  1. Check engine light illuminated
  2. Loss of communication with certain vehicle systems (e.g., ABS, airbags)
  3. Erratic behavior of gauges or warning lights on the instrument cluster
  4. Difficulty starting the vehicle
  5. Reduced fuel efficiency

How to Fix U0078 2017 Chevrolet Silverado

  1. Diagnose the specific control module causing the communication issue using a diagnostic scanner.
  2. Inspect the wiring and connections in the low-speed CAN bus network for any damage or corrosion.
  3. Repair or replace any faulty wiring, connectors, or terminals.
  4. Update the software of the affected control module if necessary.
  5. Clear the code and test the vehicle to ensure the issue has been resolved.

Cost to Fix U0078 2017 Chevrolet Silverado

The typical repair costs for addressing a U0078 code on a 2017 Chevrolet Silverado can range from $200 to $500, depending on the specific cause of the issue and the labor rates at the repair shop. This estimate includes parts and labor. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate.

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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 U0078 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U0078 in a 2017 Chevrolet Silverado?

- Common symptoms include issues with the vehicle's communication network, such as dashboard warning lights, loss of communication with control modules, and erratic behavior of vehicle systems.

2. What does the OBDII code U0078 indicate in a 2017 Chevrolet Silverado?

- The code U0078 indicates a problem with the control module communication on the Low Speed CAN Bus, which is a network that allows various control modules in the vehicle to communicate with each other.

3. What are the possible causes of OBDII code U0078 in a 2017 Chevrolet Silverado?

- Possible causes include damaged wiring or connectors in the CAN Bus network, faulty control modules, software issues, low battery voltage, or water damage.

4. How can I diagnose the OBDII code U0078 in my 2017 Chevrolet Silverado?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the wiring and connectors in the CAN Bus network, and testing the control modules for proper communication.

5. Can I still drive my 2017 Chevrolet Silverado with the OBDII code U0078 present?

- It is not recommended to drive the vehicle with the code U0078 present, as it can lead to further communication issues between control modules and potentially affect the vehicle's performance and safety systems.

6. How can I repair OBDII code U0078 in my 2017 Chevrolet Silverado?

- Repairing the code may involve repairing or replacing damaged wiring or connectors in the CAN Bus network, checking and reprogramming control modules, ensuring proper battery voltage, and addressing any software issues.

7. Is it necessary to reset the OBDII code U0078 after repairing the issue in a 2017 Chevrolet Silverado?

- Yes, it is recommended to reset the code using an OBDII scanner after repairing the underlying issue. This will clear the fault code and allow you to monitor if the problem reoccurs.

8. Can extreme weather conditions cause OBDII code U0078 in a 2017 Chevrolet Silverado?

- Yes, extreme weather conditions such as exposure to water or moisture can potentially cause the code U0078 by damaging the wiring or connectors in the CAN Bus network.

9. Are there any preventive measures to avoid OBDII code U0078 in a 2017 Chevrolet Silverado?

- Regularly inspecting the wiring and connectors in the CAN Bus network, keeping the vehicle's electrical system well-maintained, and avoiding exposure to extreme weather conditions can help prevent the occurrence of the code U0078.

10. How long does it typically take to repair OBDII code U0078 in a 2017 Chevrolet Silverado?

- The repair time for the code U0078 can vary depending on the specific cause of the issue and the extent of the repairs needed. It may take anywhere from a few hours to a full day at a professional repair shop.

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