U0073 GMC Code - Control Module Communication Bus OFF
Quick Answer
Modules connected to the high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Module/Device that is not communicating, Module/Device harness is open or shorted, Module/Device circuit poor electrical connection. 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
- U0073 GMC indicates Control Module Communication Bus OFF.
- Common causes
- Common causes include Faulty Module/Device that is not communicating, Module/Device harness is open or shorted, Module/Device circuit poor electrical connection.
- 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 U0073 GMC Description
What are the Possible Causes of the DTC U0073 GMC?
- Faulty Module/Device that is not communicating
- Module/Device harness is open or shorted
- Module/Device circuit poor electrical connection
How to Fix the DTC U0073 GMC?
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.
Code Tech Notes
2007-2010 GMC Sierra
2007-2010 GMC Yukon Models
2008-2010 GMC Sierra Hybrid
2008-2010 GMC Yukon Hybrid
GMC Factory Service Bulletin OBDII Code U0073
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0073 GMC 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.
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Information for Specific GMC Models
- U0073 2014 GMC Sierra — Control Module Communication Bus OFF
- U0073 2015 GMC Sierra — Control Module Communication Bus OFF
- U0073 2016 GMC Sierra — Control Module Communication Bus OFF
- U0073 2017 GMC Sierra — Control Module Communication Bus OFF
- U0073 2018 GMC Sierra — Control Module Communication Bus OFF
Frequently Asked Questions about U0073 GMC Code
1. What does the OBDII code U0073 mean on a GMC vehicle?
The U0073 code indicates a problem with the Control Module Communication Bus, typically caused by a loss of communication between control modules.
2. What are the common symptoms of code U0073 in a GMC?
Symptoms may include a check engine light, other warning lights, failure of certain vehicle functions, or the vehicle not starting.
3. What causes the U0073 code to appear in GMC vehicles?
Common causes include a faulty control module, damaged wiring, poor electrical connections, or issues with the Controller Area Network (CAN) bus.
4. Can a weak battery cause the U0073 code in a GMC?
Yes, a weak or failing battery can disrupt communication between modules and trigger the U0073 code.
5. How do I diagnose the U0073 code on my GMC?
Use an advanced OBDII scanner to check for additional communication-related codes, inspect wiring and connectors for damage, and test the battery and control modules.
6. Is it safe to drive with the U0073 code on a GMC vehicle?
It depends on the severity of the issue. If critical systems are affected, it may be unsafe to drive until the problem is resolved.
7. What is the first step in fixing code U0073 on a GMC?
Start by checking the battery voltage, inspecting the CAN bus wiring, and ensuring all module connectors are secure.
8. Can a damaged CAN bus cause the U0073 code?
Yes, a damaged or shorted CAN bus can prevent communication between control modules and trigger the code.
9. Do I need to replace a control module to fix the U0073 code on a GMC?
Not always. The issue might be related to wiring, connectors, or power supply, so these should be checked before replacing a module.
10. How much does it cost to repair a U0073 code on a GMC?
The cost varies depending on the root cause, but repairs could range from $100 for simple wiring fixes to over $1,000 for module replacement.
Discuss the causes and fixes for U0073 GMC OBDII Code
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