AutoCodes – Cadillac – U0403 Cadillac

U0403 Cadillac 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 Cadillac 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 1,049

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

What does this mean?

What are the Possible Causes of the DTC U0403 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code U0403 in a Cadillac?

- Common symptoms include the Service 4WD light illuminated on the dashboard, issues with shifting gears, and potential drivability problems.

2. What does the OBDII code U0403 Cadillac mean?

- The code U0403 indicates that the vehicle's onboard computer has detected invalid data being received from the Transfer Case Control Module (TCCM).

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

- Possible causes include a faulty Transfer Case Control Module, damaged wiring or connectors in the system, or issues with the communication network between modules.

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

- A proper diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for any other related codes, and conducting a thorough inspection of the transfer case control system.

5. Can driving with the U0403 code present cause further damage to my Cadillac?

- Continuing to drive with the U0403 code present may lead to increased damage to the transfer case control system and potentially compromise the vehicle's drivability.

6. Is it safe to continue driving my Cadillac with the U0403 code?

- It is not recommended to continue driving the vehicle with the U0403 code present, as it can affect the car's performance and safety.

7. How can I repair the U0403 code in my Cadillac?

- Repairing the U0403 code usually involves addressing the root cause, which may include replacing the Transfer Case Control Module, repairing damaged wiring, or addressing communication network issues.

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

- Simply clearing the code will not fix the underlying issue causing the U0403 code. It is crucial to diagnose and repair the problem to prevent the code from reappearing.

9. Can a DIY enthusiast fix the U0403 code in a Cadillac?

- While some may attempt DIY repairs, diagnosing and fixing the U0403 code often requires specialized tools and knowledge, making it advisable to seek professional assistance.

10. How much does it typically cost to repair the U0403 code in a Cadillac?

- The cost of repairing the U0403 code can vary widely depending on the specific issue, parts needed, and labor costs. It is recommended to obtain estimates from reputable mechanics or service centers.