AutoCodes – Chevrolet – U0077 2017 Chevrolet Silverado

U0077 2017 Chevrolet Silverado Code - Control Module Communication Chassis Expansion CAN Bus

Quick Answer

The devices connected to the chassis high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. 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: U0077 2017 Chevrolet Silverado indicates Control Module Communication Chassis Expansion CAN Bus.
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 593

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 U0077 2017 Chevrolet Silverado Description

The devices connected to the chassis high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices when the ignition switch is in any position other than OFF. The chassis high speed GMLAN serial data bus uses terminating resistors that are in parallel with the chassis high speed GMLAN (+) and (-) circuits. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U0077 2017 Chevrolet Silverado - Control Module Communication Chassis Expansion CAN Bus - AutoCodes.com — U0077 2017 Chevrolet Silverado Code - Control Module Communication Chassis Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U0077 2017 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 U0077 2017 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 U0077 2017 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 U0077 2017 Chevrolet Silverado code?

Need more information on how to fix the U0077 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0077 2017 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 U0077 2017 Chevrolet Silverado Code

1. What does the OBDII code U0077 on a 2017 Chevrolet Silverado mean?

The U0077 code indicates a communication problem in the chassis expansion CAN bus system, specifically related to the control module.

2. What are the common symptoms of a U0077 code in a 2017 Chevrolet Silverado?

Common symptoms include issues with various chassis control systems such as ABS, stability control, and traction control, as well as warning lights on the dashboard.

3. What are the possible causes of the U0077 code on a 2017 Chevrolet Silverado?

Potential causes include faulty control modules, damaged wiring or connectors in the CAN bus system, software issues, or a weak battery causing voltage fluctuations.

4. How can I diagnose the U0077 code on my 2017 Chevrolet Silverado?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the chassis control modules and wiring for damage, and checking for any related technical service bulletins from Chevrolet.

5. Can I still drive my 2017 Chevrolet Silverado with a U0077 code?

It is not recommended to drive the vehicle with an active U0077 code, as it can affect the proper functioning of important safety systems like ABS and stability control.

6. How can I repair a U0077 code on my 2017 Chevrolet Silverado?

Repair options include replacing faulty control modules, repairing damaged wiring or connectors, updating software if needed, and ensuring a stable electrical system with a fully charged battery.

7. Is it safe to reset the U0077 code on my 2017 Chevrolet Silverado with an OBDII scanner?

While resetting the code may temporarily clear the warning lights, it is crucial to address the underlying issue causing the U0077 code to prevent safety system malfunctions.

8. Can a DIY enthusiast fix a U0077 code on a 2017 Chevrolet Silverado?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address simpler causes like loose connections or minor wiring issues, but complex repairs may require professional help.

9. How much does it cost to repair a U0077 code on a 2017 Chevrolet Silverado?

Repair costs can vary widely depending on the specific cause of the U0077 code, but expenses may include parts like control modules or wiring harnesses, labor charges, and diagnostic fees.

10. How can I prevent the U0077 code from reoccurring on my 2017 Chevrolet Silverado?

Regular maintenance, such as checking the battery's health, ensuring proper electrical connections, and promptly addressing any warning lights, can help prevent the U0077 code from reappearing.