AutoCodes – Chevrolet – U0403 Chevrolet

U0403 Chevrolet Code - Invalid Data Received From Transfer Case Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case Control Module 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: U0403 Chevrolet indicates Invalid Data Received From Transfer Case Control Module.
Common causes: Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case Control Module 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 10,006

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 Apr 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0403 Chevrolet Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Transfer Case Control Module causing its integrity to be questioned.

OBDII Code U0403 Chevrolet - Invalid Data Received From Transfer Case Control Module - AutoCodes.com — U0403 Chevrolet Code - Invalid Data Received From Transfer Case Control Module

What does this mean?

What are the Possible Causes of the DTC U0403 Chevrolet?

Faulty Transfer Case Control Module
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection

How to Fix the DTC U0403 Chevrolet?

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 U0403 Chevrolet 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 U0403 Chevrolet Code

1. What are the common symptoms of OBDII code U0403 in a Chevrolet related to the Transfer Case Control Module?

- Common symptoms include issues with shifting gears, difficulty engaging four-wheel drive, warning lights on the dashboard, and overall drivability issues.

2. What does the OBDII code U0403 in a Chevrolet indicate?

- The code U0403 indicates that the engine control module (ECM) has detected invalid data from the Transfer Case Control Module.

3. What are the possible causes of the U0403 code in a Chevrolet?

- Possible causes include a faulty Transfer Case Control Module, wiring issues, loose connections, or a malfunction in the communication network between modules.

4. How can I diagnose the U0403 code in a Chevrolet?

- Diagnosing the U0403 code typically involves using a diagnostic scanner to retrieve the code, checking the connections to the Transfer Case Control Module, and testing the module for proper function.

5. Can I continue to drive my Chevrolet with the U0403 code present?

- It is not recommended to drive your vehicle with the U0403 code present, as it can lead to further damage and safety concerns. It is best to address the issue promptly.

6. How can I repair the U0403 code in my Chevrolet?

- Repairing the U0403 code may involve replacing the Transfer Case Control Module, repairing any wiring or connection issues, and clearing the code from the ECM using a diagnostic tool.

7. Is it possible to reset the U0403 code in a Chevrolet without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent the code from reoccurring and ensure the vehicle operates correctly.

8. Can a DIY enthusiast fix the U0403 code in a Chevrolet?

- Depending on your automotive repair skills and access to tools, you may be able to address simpler causes like loose connections. However, complex issues may require professional diagnosis and repair.

9. How much does it cost to repair the U0403 code in a Chevrolet?

- The cost of repairing the U0403 code can vary depending on the cause of the issue, parts needed for replacement, and labor costs. It is advisable to get a diagnosis from a mechanic for an accurate estimate.

10. Are there any preventive measures to avoid the U0403 code in a Chevrolet?

- Regularly inspecting and maintaining the Transfer Case Control Module, checking wiring connections, and addressing any warning signs promptly can help prevent the occurrence of the U0403 code.