U0073 Chevy Silverado | Cause and Solution

The U0073 Chevy Silverado engine code typically indicates a problem with the communication between different modules or sensors in your vehicle’s network system. This can lead to various symptoms, including stalling, reduced power, and even complete engine shutdowns.

If left unaddressed, these issues can cause damage to other components of your car’s electrical system and may result in costly repairs down the road.

This article will discuss the U0073 problems, their solutions, and how to fix them.

What Does Code U0073 Mean?

The U0073 code refers to an issue with wiring or software, and it can also indicate a problem with Control Module Communication Bus A Off. This code typically appears when the communication circuit between various control modules in a vehicle is not functioning correctly.

When the U0073 code appears on an OBD-II scanner, there might be a problem with the communication link between two or more modules in your car’s electronic system. The communication bus is responsible for transmitting data between different modules, such as the transmission control module (TCM), engine control module (ECM) and anti-lock brake system (ABS).

If these modules cannot communicate properly, it could lead to issues like stalling, poor acceleration, engine misfires and other problems.

Symptoms of U0073 Chevy Silverado:

The most common symptoms are:

  • Check engine light illumination.
  • Power lacking.
  • Bad fuel economy.
  • Instrument cluster gauges come on all the time.
  • Starting issues.

Code U0073 Chevy Silverado [3 Causes and Solutions]

Code U0073 Chevy Silverado [3 Causes and Solutions]

There are 3 causes and their solutions which we discuss now:

Short Circuit:

The U0073 code is a common error that an open or short circuit on the CAN bus can cause. The Controller Area Network (CAN) bus sends and receives messages between different modules in your vehicle’s network. This disrupts the circuit, causing a short circuit, which triggers the U0073 error code to appear on your scanner.


When you identify the cause, try to fix it; a better solution is to replace the wires.

Lost connection:

Short to ground on the CAN bus A circuit can cause a significant communication problem in your vehicle. When this happens, the ECM (Electronic Control Module) receives no information from other control modules through the CAN bus A circuit. This lost connection leads to several problems, including the engine warning light turning on.


A network problem is a major issue in communication; to fix this issue, contact an expert mechanic.

Faulty Control Module:

A faulty control module in a vehicle can be a serious problem. It is responsible for managing the entire control panel, and if it malfunctions, it can cause several issues. A malfunctioning control module can result in the sensors being unable to properly communicate with the engine control module (ECM).


It cannot be repaired so replace this with a new one.

How to Diagnose Code U0073?

There are 6 steps to diagnose code U0073, including:

How to Diagnose Code U0073?

 Check Other Codes:

One of the first things you should do when diagnosing Code U0073 is check for additional codes. An underlying issue might be causing this communication error, and checking other codes can help you identify it quickly. Once you’ve checked for additional codes like P0711 or p2363, thoroughly inspect all the vehicle’s systems to determine what needs fixing.

How to Diagnose Code U0073?

Check Visually:

To diagnose Code U0073, inspect all visible components for damage, wear or corrosion. Focus on PCM (powertrain control module) grounds located at the passenger side of most vehicles – check if they’re corroded or not properly connected.

Check the TSB Module:

Understanding the TSB module and its function in your vehicle is important. The TSB module stands for Technical Service Bulletin and provides updates or fixes for software-related issues in your car’s control modules. By checking this module, you can determine if any known problems could lead to communication issues with other modules.

Check Network Resistance:

One way to verify your network’s wiring is by measuring the resistance between VLC pins 6 and 14. These pins are essential since they connect to the CAN bus on most vehicles.

If you measure the resistance of 60 ohms between these pins, your network wires are neither open nor short-circuited. This resistance level ensures proper communication between all connected devices on the network.

Check the Fuse:

When you’re experiencing problems with your car, such as a non-functioning radio or dashboard lights not working, one of the first things to check is the fuses. Fuse 56 controls functions like power windows, sunroof and climate control systems. If any of these areas are not functioning properly, it could be due to a faulty fuse.

Another crucial fuse to check is the ECM battery fuse. The Electronic Control Module (ECM) manages many features of your vehicle’s engine and transmission systems. If this fuse is blown or not functioning correctly, there may be problems with starting your vehicle or shifting gears while driving.

Check the ABS:

One way to diagnose code U0073 is by checking the anti-lock brake system (ABS). This is because the ABS module facilitates communication between different control modules. If there’s an issue with this system, it can cause communication errors that lead to error codes like U0073.

To check if this is the case, you can use an OBD-II scanner or code reader tool to display any active error codes stored in your car’s computer system.

Note: If Checvy Silverado shows a P0711 code error, that indicates a transmission fluid temperature sensor issue that needs immediate attention. To fix. Read this article.

Can you drive with U0073?

While you may be tempted to keep driving with this error code on your dashboard, it’s essential to understand the potential risks involved. Driving with U0073 could lead to more severe problems down the line since it affects critical systems like the transmission and engine. You should stop driving immediately and take your vehicle to a mechanic for inspection.

Driving with U0073 could permanently damage your car’s electrical system or cause an accident due to the sudden failure of critical safety features like ABS or airbags.

Final Words:

The code U0073 Chevy Silverado can be a frustrating issue for any owner. It is not an uncommon problem and can usually be resolved by identifying the root cause of the error. Whether caused by a faulty sensor or wiring issue, it’s important to address this problem promptly to avoid further damage or expensive repairs.

Regular maintenance and inspection of your vehicle can also prevent these issues from occurring in the first place. So if you encounter this error code, don’t panic! Seek professional help and get your vehicle back on the road safely and efficiently.


Which issues did U0073 create in Duramax 6.6??

One of the most common issues caused by the U0073 code in Duramax 6.6 engines is a loss of power or acceleration. Other symptoms include rough idling, stalling, and difficulty starting the engine. These problems can be frustrating for drivers and may also impact fuel efficiency over time.

How does the U0073 code affect Chevy Cruze’s Lasting?

The U0073 code is a communication error that can occur in many vehicles, including the Chevy Cruze. When this error occurs, it can have lasting effects on the vehicle’s performance and overall functionality. The U0073 code typically indicates a problem with the communication system between various control modules in the car, causing issues such as reduced power or engine shutdowns.

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