AutoCodes – Jeep – U0403 Jeep

U0403 Jeep 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 Jeep 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 12,979

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

What does this mean?

What are the Possible Causes of the DTC U0403 Jeep?

Faulty Transfer Case Control Module
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U0403 Jeep?

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 Jeep 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 Jeep Code

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

The common symptoms include issues with shifting gears, the vehicle getting stuck in a particular mode, and the dashboard displaying warning lights related to the transfer case.

2. What could be causing the U0403 code in a Jeep?

The U0403 code typically indicates that the transfer case control module is not receiving valid data from the main engine control module. This could be due to a faulty control module, damaged wiring, or a poor connection.

3. How can I diagnose the U0403 code in my Jeep?

Diagnosing the U0403 code requires using an OBDII scanner to retrieve the code and then performing a thorough inspection of the transfer case control module, wiring connections, and related components to identify any issues.

4. Can I drive my Jeep with the U0403 code present?

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

5. What are some repair tips for fixing the U0403 code in a Jeep?

Repairing the U0403 code may involve checking and repairing any damaged wiring, replacing the transfer case control module if necessary, and ensuring all connections are secure and functioning properly.

6. Is the U0403 code a serious issue in a Jeep?

The U0403 code should be taken seriously as it can impact the drivability and safety of your Jeep. Ignoring the code could lead to more severe issues with the transfer case system.

7. How much does it typically cost to repair the U0403 code in a Jeep?

The cost of repairing the U0403 code can vary depending on the extent of the issue and the specific repairs needed. It's advisable to consult with a professional mechanic for an accurate estimate.

8. Can the U0403 code be intermittent in a Jeep?

Yes, the U0403 code can sometimes be intermittent, meaning it may come and go. However, it's essential to address the underlying cause of the code to prevent further issues from occurring.

9. Will resetting the U0403 code make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the U0403 code is not addressed, it is likely to reappear. It's crucial to diagnose and repair the root cause of the problem.

10. Is it possible to prevent the U0403 code from appearing in my Jeep?

Regular maintenance, including checking and maintaining the transfer case control module and related components, can help prevent issues that may trigger the U0403 code. Regular inspections and servicing can help catch potential problems early.