AutoCodes – Scion – U0073 Scion

U0073 Scion Code - Control Module Communication Bus Off

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Control Module, Control Module harness is open or shorted. 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 Scion indicates Control Module Communication Bus Off.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Control Module, Control Module harness is open or shorted.
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 588

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 22, 2023

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

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a message that includes the transmitter device availability has not been received.

OBDII Code U0073 Scion - Control Module Communication Bus Off - AutoCodes.com — U0073 Scion Code - Control Module Communication Bus Off

What does this mean?

What are the Possible Causes of the DTC U0073 Scion?

Faulty Controller Area Network (CAN) Communication System
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0073 Scion?

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 does this mean?

Code Tech Notes

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0073 Scion 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.

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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 Scion Code

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

U0073 indicates a "Control Module Communication Bus Off" issue, meaning one or more control modules have lost communication on the Controller Area Network (CAN) bus.

2. What are the common symptoms of the U0073 code in a Scion?

Symptoms may include dashboard warning lights like the check engine light, intermittent electrical issues, difficulty starting the vehicle, or failure of certain systems like ABS or stability control.

3. What causes the U0073 code to appear in a Scion?

Common causes include a faulty control module, damaged wiring or connectors in the CAN bus, a short circuit, or a low vehicle battery voltage.

4. Can a weak battery trigger the U0073 code in a Scion?

Yes, a weak or failing battery can cause voltage drops, leading to communication issues between control modules and triggering the U0073 code.

5. How do you diagnose the U0073 code in a Scion?

Diagnosis involves scanning for additional codes, inspecting the CAN bus wiring and connectors for damage, testing the battery and alternator, and checking individual control modules for faults.

6. Can I drive my Scion with the U0073 code active?

Driving with the U0073 code is not recommended, as it may result in erratic behavior of critical systems, such as brakes or steering, depending on the affected modules.

7. What is the first step to fix the U0073 code on a Scion?

The first step is to inspect and ensure the battery is fully charged and in good condition, followed by checking for loose or damaged connectors in the CAN bus system.

8. How much does it cost to repair the U0073 code on a Scion?

Repair costs vary depending on the issue. A simple battery replacement may cost $100-$200, while more complex repairs involving wiring or module replacement can cost $500 or more.

9. Can a faulty control module cause the U0073 code on a Scion?

Yes, a malfunctioning control module that cannot communicate properly on the CAN bus can trigger the U0073 code.

10. Will clearing the U0073 code with a scan tool fix the problem?

Clearing the code will only reset it temporarily. The underlying issue causing the communication fault must be resolved to prevent the code from returning.