U0073 2018 GMC Sierra Code - Control Module Communication Bus OFF
Quick Answer
The U0073 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a communication error on the control module communication bus. Common causes include Faulty Control Module: A defective control module could be causing the communication bus to go offline, Wiring Issues: Damaged wiring or connectors in the communication bus system can disrupt the flow of information, Software Glitch: A software glitch in one of the control modules could be causing communication errors. 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 2018 GMC Sierra indicates Control Module Communication Bus OFF.
- Common causes
- Common causes include Faulty Control Module: A defective control module could be causing the communication bus to go offline, Wiring Issues: Damaged wiring or connectors in the communication bus system can disrupt the flow of information, Software Glitch: A software glitch in one of the control modules could be causing communication errors.
- 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 U0073 2018 GMC Sierra Description
The U0073 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a communication error on the control module communication bus. This means that there is a problem with the network that allows various control modules within the vehicle to communicate with each other. Control modules are essentially small computers that manage various systems within the vehicle, such as the engine, transmission, brakes, and more.
Common Causes of U0073 2018 GMC Sierra
- Faulty Control Module: A defective control module could be causing the communication bus to go offline.
- Wiring Issues: Damaged wiring or connectors in the communication bus system can disrupt the flow of information.
- Software Glitch: A software glitch in one of the control modules could be causing communication errors.
- Battery or Charging System Problems: Issues with the vehicle's battery or charging system could affect the power supply to the control modules.
- Water Damage: Water intrusion into the control module or wiring harness could also cause communication issues.
Symptoms of U0073 2018 GMC Sierra
- Check Engine Light: The most common symptom associated with the U0073 code is the illumination of the Check Engine Light on the vehicle's dashboard.
- Erratic Behavior: The vehicle may exhibit erratic behavior, such as stalling, rough idling, or difficulty starting.
- Loss of Power: The vehicle may experience a loss of power or acceleration due to the communication issues between control modules.
- Transmission Issues: Problems with shifting gears or transmission performance may occur.
- Inoperative Systems: Various systems within the vehicle, such as the ABS brakes, airbags, or stability control, may become inoperative.
How to Fix U0073 2018 GMC Sierra
- Diagnose the Issue: Use a diagnostic tool to read the codes and determine the exact cause of the communication bus error.
- Inspect Wiring and Connectors: Check for any damaged wiring or connectors in the communication bus system and repair or replace as needed.
- Test Control Modules: Test each control module to identify any faulty ones that may be causing the issue and replace if necessary.
- Update Software: Update the software on the control modules to the latest version to address any potential glitches.
- Check Battery and Charging System: Ensure that the vehicle's battery and charging system are functioning properly to supply power to the control modules.
Cost to Fix U0073 2018 GMC Sierra
The cost of repairing a U0073 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for replacing a faulty control module or damaged wiring could range from $200 to $500 or more. Labor costs at an auto repair shop can add an additional $100 to $200 per hour, with the total repair time typically taking between 1-3 hours. Therefore, the total cost for resolving this issue could range from $300 to $900 or more, depending on the extent of the repairs needed. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and specific repair shop rates.
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Frequently Asked Questions about U0073 2018 GMC Sierra Code
1. What does the OBDII code U0073 for a 2018 GMC Sierra mean?
The code U0073 indicates a communication bus off error related to the control module communication system in the vehicle.
2. What are the common symptoms of the U0073 code in a 2018 GMC Sierra?
Common symptoms include issues with the vehicle's electrical systems, such as warning lights on the dashboard, loss of communication with various control modules, and sporadic or complete loss of certain functions.
3. What are the possible causes of the U0073 code in a 2018 GMC Sierra?
Potential causes include damaged wiring or connectors, faulty control modules, software issues, a weak or dead battery, or a problem with the communication network itself.
4. How can I diagnose the U0073 code in my 2018 GMC Sierra?
Diagnosis typically involves checking the wiring and connectors for damage, testing the control modules for proper function, and using a scan tool to analyze the communication network for faults.
5. How can I repair the U0073 code in my 2018 GMC Sierra?
Repairing the U0073 code may involve repairing or replacing damaged wiring, connectors, or control modules, updating software if necessary, and ensuring the battery is in good condition.
6. Can I continue driving my 2018 GMC Sierra with the U0073 code present?
It is not recommended to drive the vehicle with the U0073 code active, as it may lead to further electrical issues or loss of critical functions while driving.
7. Will resetting the U0073 code make it go away permanently?
Resetting the code may temporarily clear the warning light, but if the underlying issue causing the U0073 code is not fixed, it is likely to return.
8. How much does it typically cost to repair the U0073 code in a 2018 GMC Sierra?
The cost of repair can vary depending on the specific cause of the U0073 code, but it may range from a simple fix like repairing wiring to more complex issues involving control module replacement.
9. Can a DIY enthusiast fix the U0073 code in a 2018 GMC Sierra?
DIY enthusiasts with the necessary tools and knowledge of automotive electrical systems may be able to diagnose and repair simple causes of the U0073 code, such as checking for loose connections or damaged wiring.
10. Is the U0073 code specific to the 2018 GMC Sierra, or can it occur in other vehicles?
The U0073 code is not specific to the 2018 GMC Sierra and can occur in other vehicles with similar control module communication systems.
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