AutoCodes – Chevrolet – U0078 2014 Chevrolet Silverado

U0078 2014 Chevrolet Silverado Code - Control Module Communication Low Speed CAN Bus Off

Quick Answer

The low-speed General Motor Local Area Network (GMLAN) serial data bus is used to communicate information between the devices. 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: U0078 2014 Chevrolet Silverado indicates Control Module Communication Low Speed 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.

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Code Popularity 332

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0078 2014 Chevrolet Silverado Description

The low-speed General Motor Local Area Network (GMLAN) serial data bus is used to communicate information between the devices. The serial data is transmitted over a single wire to the appropriate devices. The low-speed GMLAN serial data circuits also connect directly to the Data Link Connector (DLC). The Diagnostic Trouble Code (DTC) sets when the device setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 s.

OBDII Code U0078 2014 Chevrolet Silverado - Control Module Communication Low Speed CAN Bus Off - AutoCodes.com — U0078 2014 Chevrolet Silverado Code - Control Module Communication Low Speed CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U0078 2014 Chevrolet Silverado?

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 U0078 2014 Chevrolet Silverado?

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 U0078 2014 Chevrolet Silverado 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.

Need more information about the U0078 2014 Chevrolet Silverado code?

Need more information on how to fix the U0078 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U0078 in a 2014 Chevrolet Silverado?

- Common symptoms include issues with various vehicle control modules, communication errors between modules, dashboard warning lights, and possible drivability issues.

2. What does the U0078 code indicate in a 2014 Chevrolet Silverado?

- The U0078 code indicates a communication problem between control modules on the low-speed Controller Area Network (CAN) bus in the vehicle.

3. What are some possible causes of the U0078 code in a 2014 Chevrolet Silverado?

- Possible causes include damaged wiring or connectors, faulty control modules, a short circuit in the CAN bus, water damage, or software issues.

4. How can I diagnose the U0078 code in my 2014 Chevrolet Silverado?

- Diagnosis typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connectors for damage, and testing the control modules for functionality.

5. Can I still drive my 2014 Chevrolet Silverado with the U0078 code present?

- It is not recommended to drive the vehicle with the U0078 code present, as it can lead to further issues with the vehicle's electronic systems.

6. How can I repair the U0078 code in my 2014 Chevrolet Silverado?

- Repairing the U0078 code may involve fixing any damaged wiring or connectors, replacing faulty control modules, addressing any short circuits, and ensuring proper communication on the CAN bus.

7. Is it safe to clear the U0078 code in my 2014 Chevrolet Silverado with a diagnostic scanner?

- Clearing the code with a diagnostic scanner may temporarily turn off the warning light, but it is essential to address the root cause of the issue to prevent the code from reoccurring.

8. Can the U0078 code in a 2014 Chevrolet Silverado be triggered by a dead battery?

- Yes, a dead or disconnected battery can sometimes trigger communication errors between control modules and lead to the U0078 code in a 2014 Chevrolet Silverado.

9. How do I prevent the U0078 code from coming back in my 2014 Chevrolet Silverado?

- Regular maintenance, checking for wiring issues, ensuring proper connections, and addressing any electrical problems promptly can help prevent the U0078 code from reoccurring.

10. Will resetting the vehicle's computer system resolve the U0078 code in a 2014 Chevrolet Silverado?

- Resetting the computer system may temporarily clear the code, but it is crucial to diagnose and fix the underlying issue causing the U0078 code for a permanent solution.