U0077 2016 GMC Sierra 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 2016 GMC Sierra 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.
Code U0077 2016 GMC Sierra Description
What are the Possible Causes of the DTC U0077 2016 GMC Sierra?
- 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 2016 GMC Sierra?
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 2016 GMC Sierra 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 2016 GMC Sierra code?
Need more information on how to fix the U0077 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U0077 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about U0077 2016 GMC Sierra Code
1. What does the OBDII code U0077 mean on a 2016 GMC Sierra?
The U0077 code indicates a communication issue on the Chassis Expansion CAN Bus, which is part of the vehicle's control module network.
2. What are the common symptoms of code U0077 in a 2016 GMC Sierra?
Symptoms may include warning lights on the dashboard (e.g., ABS or traction control), loss of communication with certain modules, or intermittent electrical issues.
3. What causes the U0077 code to appear on a 2016 GMC Sierra?
Common causes include faulty wiring or connectors in the CAN Bus system, a defective control module, or interference from aftermarket devices.
4. How do I diagnose the U0077 code on my 2016 GMC Sierra?
Start by checking the CAN Bus wiring for damage or loose connections. Use a scan tool to verify communication between modules and inspect for other related trouble codes.
5. Can a bad control module cause the U0077 code?
Yes, a malfunctioning control module can disrupt communication on the CAN Bus and trigger the U0077 code.
6. Is it safe to drive a 2016 GMC Sierra with the U0077 code?
It may be possible to drive, but safety systems like ABS or stability control may not function correctly. It's best to repair the issue promptly.
7. How do I fix the U0077 code on my 2016 GMC Sierra?
Repairs may include fixing damaged wiring, reconnecting loose connectors, or replacing a faulty control module. A thorough diagnostic is essential.
8. Can aftermarket accessories cause the U0077 code?
Yes, improperly installed accessories can interfere with the CAN Bus system and cause communication errors like U0077.
9. How much does it cost to fix the U0077 code on a 2016 GMC Sierra?
Costs vary depending on the cause. Minor wiring repairs may cost $100-$300, while replacing a control module could range from $500 to $1,500.
10. Will clearing the U0077 code fix the problem?
Clearing the code may temporarily remove it, but the underlying issue must be resolved to prevent it from returning.
Discuss the causes and fixes for U0077 2016 GMC Sierra OBDII Code
Code U0077 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
