AutoCodes – Saturn – U0073 Saturn

U0073 Saturn 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 CAN communication system, CAN System harness is open or shorted, CAN System 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 Saturn indicates Control Module Communication Bus OFF.
Common causes: Common causes include Faulty CAN communication system, CAN System harness is open or shorted, CAN System 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.

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Code Popularity 16,690

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0073 Saturn Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.

OBDII Code U0073 Saturn - Control Module Communication Bus OFF - AutoCodes.com — U0073 Saturn Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 Saturn?

Faulty CAN communication system
CAN System harness is open or shorted
CAN System circuit poor electrical connection

How to Fix the DTC U0073 Saturn?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0073 Saturn 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.

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

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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.