AutoCodes – Generic – U0304

U0304 Code - Software Incompatibility With Gear Shift Control Module 'A'

Quick Answer

Some devices must be configured with specific software, serial numbers, vehicle options, or other information. Common causes include Gear Shift Control Module 'A' Programmed With Incorrect Software, Faulty Gear Shift Control Module 'A'. 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: U0304 indicates Software Incompatibility With Gear Shift Control Module 'A'.
Common causes: Common causes include Gear Shift Control Module 'A' Programmed With Incorrect Software, Faulty Gear Shift Control Module 'A'.
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 11,417

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 U0304 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 Gear Shift Control Module 'A' is not configured properly

OBDII Code U0304 - Software Incompatibility With Gear Shift Control Module 'A' - AutoCodes.com — U0304 Code - Software Incompatibility With Gear Shift Control Module 'A'

What does this mean?

What are the Possible Causes of the DTC U0304?

Gear Shift Control Module 'A' Programmed With Incorrect Software
Faulty Gear Shift Control Module 'A'

How to Fix the DTC U0304?

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 U0304 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.