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U0077 2017 GMC Sierra Code - Control Module Communication Chassis Expansion CAN Bus

Quick Answer

The U0077 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Control Module Communication Chassis Expansion CAN Bus. Common causes include Faulty chassis control module, Wiring or connection issues in the CAN Bus network, Corrosion or damage to the communication lines. 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 GMC Sierra indicates Control Module Communication Chassis Expansion CAN Bus.
Common causes
Common causes include Faulty chassis control module, Wiring or connection issues in the CAN Bus network, Corrosion or damage to the communication lines.
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 14, 2024
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Code U0077 2017 GMC Sierra Description

The U0077 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Control Module Communication Chassis Expansion CAN Bus. This code specifically relates to a communication issue within the chassis control module network, which can affect the vehicle's performance and functionality. The CAN (Controller Area Network) Bus is a communication system that allows various modules in the vehicle to exchange information and control different functions. When there is a fault in the communication between these modules, it can lead to a range of issues.

OBDII Code U0077 2017 GMC Sierra - Control Module Communication Chassis Expansion CAN Bus
U0077 2017 GMC Sierra Code - Control Module Communication Chassis Expansion CAN Bus

Common Causes of U0077 2017 GMC Sierra

  1. Faulty chassis control module
  2. Wiring or connection issues in the CAN Bus network
  3. Corrosion or damage to the communication lines
  4. Software glitches or updates needed for control modules
  5. Electrical interference from aftermarket accessories

Symptoms of U0077 2017 GMC Sierra

  1. ABS warning light illuminated on the dashboard
  2. Traction control or stability control system malfunctions
  3. Loss of power steering assistance
  4. Erratic behavior in braking system
  5. Inability to engage certain chassis-related functions

How to Fix U0077 2017 GMC Sierra

  1. Perform a thorough diagnostic scan to identify the specific module causing the communication issue.
  2. Inspect the wiring and connections in the CAN Bus network for any damage or corrosion.
  3. Test the chassis control module for proper functionality and communication.
  4. Address any software updates or glitches in the control modules.
  5. Clear the DTC and perform a test drive to ensure the issue is resolved.

Cost to Fix U0077 2017 GMC Sierra

The typical repair costs for addressing the U0077 code on a 2017 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the labor rates at the auto repair shop. This estimate includes parts and labor for diagnosing the problem, repairing or replacing faulty components, and performing necessary tests to ensure proper functionality. It's important to note that actual costs may vary based on the location, vehicle make and model, and the extent of the repairs needed. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate. Labor rates at auto repair shops can vary between $80 and $150 per hour, with rates potentially higher at dealerships or in metropolitan areas, and lower at independent shops.

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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 U0077 2017 GMC Sierra Code

1. What does OBDII code U0077 mean on a 2017 GMC Sierra?

Code U0077 indicates a communication issue on the Chassis Expansion CAN (Controller Area Network) Bus, where modules are unable to communicate properly.

2. What are the common symptoms of code U0077 in a 2017 GMC Sierra?

Symptoms may include warning lights on the dashboard, malfunctioning electronic components (such as ABS or traction control), and intermittent or complete loss of communication with certain modules.

3. What causes the U0077 code on a GMC Sierra?

Common causes include a damaged or disconnected CAN Bus wiring, a faulty control module, corrosion in connectors, or a shorted circuit in the CAN Bus system.

4. Can a weak battery cause the U0077 code in a 2017 GMC Sierra?

Yes, a weak or failing battery can lead to insufficient voltage for proper CAN Bus communication, potentially triggering the U0077 code.

5. How can I diagnose the U0077 code on my 2017 GMC Sierra?

Start by inspecting the CAN Bus wiring and connectors for damage or corrosion, check the battery voltage, and use a scan tool to identify which module is not communicating.

6. Is it safe to drive my 2017 GMC Sierra with the U0077 code?

Driving with this code may impact the functionality of critical systems like ABS or traction control, so it is not recommended until the issue is resolved.

7. How do I fix the U0077 code on a 2017 GMC Sierra?

Repairs may include repairing or replacing damaged wiring or connectors, cleaning corroded connectors, or replacing a faulty control module.

8. Can clearing the U0077 code with a scan tool fix the problem?

Clearing the code may temporarily remove the warning, but it won’t fix the underlying communication issue. Proper diagnosis and repair are necessary.

9. How much does it cost to repair the U0077 code on a GMC Sierra?

Repair costs vary depending on the cause, ranging from $100 for simple wiring repairs to $500 or more for module replacement.

10. Can a software update fix the U0077 code on a 2017 GMC Sierra?

In some cases, a software update for the affected control module may resolve communication issues, but it depends on the specific problem diagnosed.

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