AutoCodes – GMC – U0403 GMC

U0403 GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,936

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC U0403 GMC?

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 GMC?

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 GMC 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 U0403 GMC code?

Need more information on how to fix the U0403 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0403 GMC 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 U0403 GMC Code

1. What are common symptoms of the OBDII code U0403 GMC?

The common symptoms of the U0403 code may include issues with the transfer case, such as difficulty shifting gears, warning lights on the dashboard, or decreased performance.

2. What does the OBDII code U0403 GMC indicate?

The U0403 code 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 GMC vehicle?

Possible causes of the U0403 code include a faulty transfer case control module, damaged wiring or connectors, a software glitch, or a communication error between modules.

4. How can I diagnose the U0403 code in my GMC vehicle?

Diagnosing the U0403 code typically involves using a diagnostic scanner to retrieve the code, checking for any associated codes, inspecting wiring and connectors for damage, and testing the transfer case control module.

5. Can I still drive my GMC vehicle with the U0403 code present?

It is not recommended to drive your vehicle with the U0403 code present, as it may lead to further damage to the transfer case or other components. It's best to address the issue promptly.

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

Repairing the U0403 code may involve replacing the transfer case control module, repairing or replacing damaged wiring or connectors, updating software, or addressing any communication issues between modules.

7. Is the U0403 code a serious issue in a GMC vehicle?

While the U0403 code may not cause immediate drivability issues, it is still important to address it promptly to prevent potential damage to the transfer case or other related components.

8. Can a DIY enthusiast fix the U0403 code issue in a GMC vehicle?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address the U0403 code by following repair guides or instructions specific to the GMC model and year.

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

The cost of repairing the U0403 code can vary depending on the underlying cause, parts needed, labor costs, and whether you choose to address the issue yourself or take it to a professional mechanic.

10. How can I prevent the U0403 code from recurring in my GMC vehicle?

To prevent the U0403 code from recurring, it's important to address any underlying issues promptly, perform regular maintenance on your vehicle, and ensure all modules are functioning correctly.