Engine-Codes.com
Engine-Codes – Saturn – U0073 Saturn

U0073 Saturn Code - Control Module Communication Bus OFF

Quick Answer

The U0073 code for Saturn vehicles indicates that there is a communication bus OFF error within the control module system. Common causes include Faulty Control Module: A malfunctioning control module could be causing the communication bus OFF error, Wiring Harness Issues: Damage to the wiring harness that connects the control modules could disrupt communication, Loose Connections: Loose or corroded connections between control modules and the CAN bus could be a potential cause. 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 Saturn indicates Control Module Communication Bus OFF.
Common causes
Common causes include Faulty Control Module: A malfunctioning control module could be causing the communication bus OFF error, Wiring Harness Issues: Damage to the wiring harness that connects the control modules could disrupt communication, Loose Connections: Loose or corroded connections between control modules and the CAN bus could be a potential cause.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U0073 Saturn Description

The U0073 code for Saturn vehicles indicates that there is a communication bus OFF error within the control module system. In modern vehicles, the various control modules (such as the powertrain control module, transmission control module, body control module, etc.) communicate with each other over a network known as the Controller Area Network (CAN). This network allows these modules to share data and work together to ensure the proper functioning of the vehicle.

OBDII Code U0073 Saturn - Control Module Communication Bus OFF
U0073 Saturn Code - Control Module Communication Bus OFF

Common Causes of U0073 Saturn

  1. Faulty Control Module: A malfunctioning control module could be causing the communication bus OFF error.
  2. Wiring Harness Issues: Damage to the wiring harness that connects the control modules could disrupt communication.
  3. Loose Connections: Loose or corroded connections between control modules and the CAN bus could be a potential cause.
  4. Software Glitch: A software glitch within the control module system could lead to communication errors.
  5. Water Damage: Exposure to moisture or water intrusion could damage the control modules and disrupt communication.

Symptoms of U0073 Saturn

  1. Check Engine Light: The most common symptom associated with the U0073 code is the illumination of the check engine light on the dashboard.
  2. Loss of Communication: The vehicle may experience intermittent or complete loss of communication with certain control modules, leading to erratic behavior.
  3. Performance Issues: The vehicle may exhibit poor performance, rough idling, stalling, or difficulty starting.
  4. Warning Lights: Other warning lights related to ABS, traction control, or airbags may also illuminate on the dashboard.
  5. Inability to Access Data: Mechanics may have difficulty accessing diagnostic data from the affected control modules.

How to Fix U0073 Saturn

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the source of the communication bus OFF error.
  2. Check Wiring and Connections: Inspect the wiring harness and connections for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test Control Modules: Test each control module on the network to identify any faulty units that may be causing the communication error.
  4. Clear Codes and Reset Modules: Clear the trouble codes from the system and reset the control modules to see if the issue persists.
  5. Perform a Test Drive: After repairs have been made, take the vehicle for a test drive to ensure that the communication between control modules has been restored and that all systems are functioning properly.

Cost to Fix U0073 Saturn

The cost of repairing a U0073 code for a Saturn vehicle can vary depending on the underlying cause of the issue. In general, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local repair shops for a more accurate estimate based on your specific situation.

Need more information about the U0073 Saturn code?

Need more information on how to fix the U0073 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0073 Saturn code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0073 Saturn Code

1. What does the OBDII code U0073 mean on a Saturn vehicle?

U0073 indicates a communication problem on the Controller Area Network (CAN) bus, where one or more control modules are unable to communicate properly.

2. What are common symptoms of U0073 in a Saturn?

Symptoms may include the check engine light or other warning lights turning on, failure of certain systems like ABS or traction control, difficulty starting the vehicle, or erratic behavior of electronic components.

3. What causes the U0073 code to appear on a Saturn?

Common causes include a damaged or shorted CAN bus wiring, a faulty control module, loose or corroded connections, or a low vehicle battery voltage.

4. Can a weak battery cause the U0073 code on a Saturn?

Yes, a weak or low battery can cause voltage drops that disrupt communication on the CAN bus, triggering the U0073 code.

5. How do you diagnose a U0073 code in a Saturn?

Diagnosis typically involves inspecting the CAN bus wiring for damage or corrosion, checking the battery voltage, testing module communication with a scan tool, and ensuring proper grounding and connections.

6. Is it safe to drive a Saturn with the U0073 code?

It may be unsafe, as critical systems like ABS or stability control could be affected. It's best to address the issue promptly.

7. What tools are needed to troubleshoot the U0073 code?

A scan tool with CAN communication capability, a multimeter, and wiring diagrams are essential for diagnosing the problem.

8. Can a blown fuse trigger the U0073 code in a Saturn?

Yes, a blown fuse related to the CAN bus or control modules can disrupt communication and cause the U0073 code.

9. How is the U0073 code typically repaired in a Saturn?

Repairs may involve fixing or replacing damaged CAN bus wiring, cleaning or tightening connections, replacing a faulty module, or addressing battery issues.

10. Can a software update fix the U0073 code on a Saturn?

In some cases, a software update for one or more control modules may resolve communication issues triggering the U0073 code. Consult a dealership or qualified technician.

Discuss the causes and fixes for U0073 Saturn OBDII Code

Submit a New Comment

Code U0073 Saturn comments

No comments found for this page.