AutoCodes – Generic – U0303

U0303 Code - Software Incompatibility With Transfer Case Control Module

Quick Answer

Some devices must be configured with specific software, serial numbers, vehicle options, or other information. Common causes include Transfer Case Control Module Programmed With Incorrect Software, Faulty Transfer Case Control Module. 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: U0303 indicates Software Incompatibility With Transfer Case Control Module.
Common causes: Common causes include Transfer Case Control Module Programmed With Incorrect Software, Faulty Transfer Case Control Module.
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 3,956

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code U0303 Description

Some devices must be configured with specific software, serial numbers, vehicle options, or other information. If a device was not properly configured after installation that the device may set the appropriate communication Diagnostic Trouble Code (DTC)s. No external circuit diagnosis is involved. The DTC sets when the Transfer Case Control Module is not configured properly

OBDII Code U0303 - Software Incompatibility With Transfer Case Control Module - AutoCodes.com — U0303 Code - Software Incompatibility With Transfer Case Control Module

What does this mean?

What are the Possible Causes of the DTC U0303?

Transfer Case Control Module Programmed With Incorrect Software
Faulty Transfer Case Control Module

How to Fix the DTC U0303?

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 U0303 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.