AutoCodes – Ford – U0403 Ford

U0403 Ford 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 Ford 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 3,817

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

What does this mean?

What are the Possible Causes of the DTC U0403 Ford?

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 Ford?

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 Ford 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 Ford Code

What does the OBDII code U0403 mean for my Ford vehicle?

The code U0403 indicates that the Powertrain Control Module (PCM) has received invalid data from the Transfer Case Control Module (TCCM).

What are the common symptoms of the U0403 code?

Common symptoms include malfunctioning four-wheel drive, erratic shifting, warning lights on the dashboard, and poor vehicle performance.

What could cause the U0403 code to trigger?

Possible causes include a faulty Transfer Case Control Module, wiring issues, poor connections, or a malfunctioning PCM.

How can I diagnose the U0403 code?

To diagnose the U0403 code, use an OBD-II scanner to confirm the code, inspect the wiring and connectors, and check the functionality of the Transfer Case Control Module.

What are some repair tips for fixing the U0403 code?

Repair tips include checking and repairing any damaged wiring, ensuring all connectors are secure, and testing or replacing the Transfer Case Control Module if necessary.

Can I drive my Ford vehicle with the U0403 code?

It is not recommended to drive your vehicle with this code, as it can lead to further damage and affect drivability, especially in four-wheel drive conditions.

Is it necessary to reset the OBDII code after repairs?

Yes, after completing repairs, it's important to clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved.

How much does it typically cost to fix the U0403 code?

Repair costs can vary widely depending on the cause, but it can range from a simple wiring repair to several hundred dollars if the Transfer Case Control Module needs replacement.

Can the U0403 code affect my vehicle's fuel efficiency?

Yes, if the four-wheel drive system is malfunctioning due to the U0403 code, it may negatively impact fuel efficiency and overall vehicle performance.

What should I do if the U0403 code keeps coming back after repairs?

If the code reappears, further diagnosis may be needed, including checking for additional fault codes, inspecting the PCM, or consulting a professional mechanic for a thorough evaluation.