AutoCodes – Mercury – U0403 Mercury

U0403 Mercury 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 Mercury 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 621

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

What does this mean?

What are the Possible Causes of the DTC U0403 Mercury?

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 Mercury?

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 Mercury 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 Mercury Code

1. What are common symptoms of the OBDII code U0403 in a Mercury vehicle?

- Common symptoms include the service 4WD light illuminated on the dashboard, issues with engaging or disengaging four-wheel drive, and potential transmission shifting problems.

2. What does the U0403 code "Invalid Data Received From Transfer Case Control Module" mean in a Mercury vehicle?

- This code indicates that the engine control module (ECM) has detected a communication problem with the transfer case control module, which manages the four-wheel drive system.

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

- Possible causes include a faulty transfer case control module, damaged wiring or connectors in the communication network, software issues, or a malfunctioning ECM.

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

- Diagnosing the U0403 code typically involves using a professional OBDII scanner to retrieve the code and checking the communication between the ECM and the transfer case control module.

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

- It is not recommended to drive your Mercury with the U0403 code present, as it can lead to potential safety issues and further damage to the vehicle's four-wheel drive system.

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

- Repairing the U0403 code may involve replacing the transfer case control module, repairing any damaged wiring or connectors, updating software, or reprogramming the ECM.

7. Will resetting the trouble codes make the U0403 code go away permanently?

- Resetting the trouble codes may temporarily clear the U0403 code, but it is likely to return if the underlying issue with the transfer case control module communication is not addressed.

8. Are there any DIY tips for fixing the U0403 code in my Mercury?

- DIY tips for fixing the U0403 code include checking and securing wiring connections, ensuring proper ground connections, and performing a visual inspection for any obvious damage.

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

- The cost of repairing the U0403 code can vary depending on the specific issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can the U0403 code cause any long-term damage to my Mercury vehicle if left unresolved?

- If left unresolved, the U0403 code can potentially cause long-term damage to the transfer case control module, the ECM, or other components of the four-wheel drive system in your Mercury vehicle.