U0073 2018 Chevrolet Silverado Code - Control Module Communication Bus OFF
Quick Answer
The U0073 code for a 2018 Chevrolet Silverado indicates that there is a communication error on the control module communication bus. Common causes include Damaged Wiring: Corrosion, fraying, or breaks in the wiring harness connecting the control modules can disrupt communication, Faulty Control Module: A malfunctioning control module can prevent proper communication with other modules on the bus, Software Glitch: A software issue within one of the control modules can lead to 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 Chevrolet Silverado indicates Control Module Communication Bus OFF.
- Common causes
- Common causes include Damaged Wiring: Corrosion, fraying, or breaks in the wiring harness connecting the control modules can disrupt communication, Faulty Control Module: A malfunctioning control module can prevent proper communication with other modules on the bus, Software Glitch: A software issue within one of the control modules can lead to 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 Chevrolet Silverado Description
The U0073 code for a 2018 Chevrolet Silverado indicates that there is a communication error on the control module communication bus. In modern vehicles, various control modules communicate with each other over a network known as the Controller Area Network (CAN). This network allows different systems in the vehicle to share information and work together seamlessly. When the U0073 code is triggered, it means that there is a loss of communication between one or more control modules on the bus.
Common Causes of U0073 2018 Chevrolet Silverado
- Damaged Wiring: Corrosion, fraying, or breaks in the wiring harness connecting the control modules can disrupt communication.
- Faulty Control Module: A malfunctioning control module can prevent proper communication with other modules on the bus.
- Software Glitch: A software issue within one of the control modules can lead to communication errors.
- Power Supply Problems: Inadequate power supply to the control modules can cause communication issues.
- Environmental Factors: Extreme temperatures, moisture, or physical damage to the control modules can also contribute to the U0073 code.
Symptoms of U0073 2018 Chevrolet Silverado
- Check Engine Light: The most common symptom associated with the U0073 code is the illumination of the check engine light on the dashboard.
- Transmission Issues: Problems with shifting gears or erratic transmission behavior can occur due to the loss of communication between the engine and transmission control modules.
- ABS/Traction Control Warning Lights: The ABS and traction control warning lights may illuminate, indicating a communication error between these systems.
- Loss of Power: The vehicle may experience a loss of power or reduced performance due to the inability of different systems to communicate effectively.
- Unresponsive Controls: Controls such as the power windows, door locks, or climate control may not function properly if communication is disrupted.
How to Fix U0073 2018 Chevrolet Silverado
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the source of the communication error.
- Inspect Wiring and Connectors: Check the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as necessary.
- Test Control Modules: Test each control module on the communication bus to identify any faulty units. Replace any malfunctioning modules.
- Update Software: If a software glitch is suspected, update the software in the affected control modules to resolve the communication error.
- Verify Power Supply: Ensure that the control modules are receiving adequate power by checking the power supply and connections.
Cost to Fix U0073 2018 Chevrolet Silverado
The typical repair costs for addressing the U0073 code on a 2018 Chevrolet Silverado can range from $200 to $500, depending on the specific cause of the communication error and the parts/labour required for the repair. This estimate includes diagnostic time, parts replacement (wiring harness, control modules), and labour costs. However, it's important to note that actual repair costs can vary based on factors such as location, dealership vs. independent shop rates, and the extent of the issue. It's recommended to consult with a qualified mechanic for a more accurate cost estimate based on your vehicle's specific needs.
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Frequently Asked Questions about U0073 2018 Chevrolet Silverado Code
1. What does the OBDII code U0073 mean on a 2018 Chevrolet Silverado?
The U0073 code indicates a "Control Module Communication Bus OFF," meaning there's a communication issue between the control modules on the vehicle's Controller Area Network (CAN) bus.
2. What are the common symptoms of the U0073 code in a 2018 Chevrolet Silverado?
Symptoms may include illuminated warning lights (e.g., check engine or service stability), intermittent electrical issues, unresponsive modules, or the vehicle failing to start.
3. What causes the U0073 code on a Chevrolet Silverado?
Common causes include faulty wiring or connectors in the CAN bus, a low or weak battery, issues with the communication modules, or a blown fuse related to the CAN system.
4. Can a weak battery cause the U0073 code in a 2018 Silverado?
Yes, a weak or failing battery can disrupt communication between modules and trigger the U0073 code.
5. How do you diagnose the U0073 code on a 2018 Chevrolet Silverado?
Diagnosis typically involves using a scan tool to check for other related codes, inspecting the CAN bus wiring and connectors, testing the battery, and verifying module functionality.
6. Can a blown fuse cause the U0073 code to appear?
Yes, a blown fuse in the circuit powering the CAN bus or related control modules can cause the U0073 code.
7. Is it safe to drive a 2018 Chevrolet Silverado with the U0073 code?
It depends on the severity of the symptoms. If the vehicle has significant electrical issues or fails to start, it’s not safe to drive and should be inspected immediately.
8. What are the repair options for the U0073 code?
Repairs may include replacing damaged wiring or connectors, recharging or replacing the battery, repairing or replacing faulty control modules, or replacing blown fuses.
9. How much does it cost to fix the U0073 code on a Silverado?
Repair costs vary based on the cause but can range from $50 for minor wiring fixes to $500 or more if a module needs replacement.
10. Can clearing the code with a scan tool fix the U0073 issue?
Clearing the code may temporarily turn off the warning light, but it won’t fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.
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