AutoCodes – Chevrolet – U0078 2015 Chevrolet Silverado

U0078 2015 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 2015 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 329

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2015 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 2015 Chevrolet Silverado - Control Module Communication Low Speed CAN Bus Off - AutoCodes.com — U0078 2015 Chevrolet Silverado Code - Control Module Communication Low Speed CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U0078 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the U0078 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0078 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U0078 in a 2015 Chevrolet Silverado?

- Common symptoms include issues with the vehicle's communication systems, such as dashboard warning lights, loss of power steering, erratic gauge behavior, and problems with the transmission.

2. What does the OBDII code U0078 mean for a 2015 Chevrolet Silverado?

- The code U0078 indicates a communication problem between control modules in the vehicle, specifically low-speed CAN bus off.

3. What are the possible causes of OBDII code U0078 in a 2015 Chevrolet Silverado?

- Possible causes include damaged wiring or connectors in the CAN bus network, faulty control modules, software issues, or a low vehicle battery voltage.

4. How can I diagnose the OBDII code U0078 in my 2015 Chevrolet Silverado?

- Diagnosing this code typically involves using a diagnostic scanner to read the trouble codes, checking the CAN bus network for faults, inspecting wiring and connectors, and testing control modules for proper operation.

5. Can I still drive my 2015 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 electrical problems and potential safety hazards.

6. How can I repair OBDII code U0078 in my 2015 Chevrolet Silverado?

- Repairing this code may involve repairing or replacing damaged wiring, connectors, or control modules, updating software, or resetting the system with a diagnostic tool.

7. Are there any DIY tips for fixing the U0078 code in a 2015 Chevrolet Silverado?

- DIY tips include checking for loose or damaged wiring, ensuring proper battery voltage, and performing a reset using a diagnostic scanner before seeking professional assistance.

8. Can a faulty battery cause the U0078 code in a 2015 Chevrolet Silverado?

- Yes, a low or faulty battery can cause communication issues and trigger the U0078 code in the control module communication system.

9. How long does it typically take to repair OBDII code U0078 in a 2015 Chevrolet Silverado?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a day for a professional technician to diagnose and fix the problem.

10. Is it important to address the U0078 code promptly in a 2015 Chevrolet Silverado?

- Yes, addressing the U0078 code promptly is crucial to prevent further damage to the vehicle's electrical systems and ensure safe and reliable operation.