AutoCodes – GMC – U0305 GMC

U0305 GMC Code - Software Incompatibility With Cruise Control Module

Quick Answer

Some devices must be configured with specific software, serial numbers, vehicle options, or other information. Common causes include Cruise Control Module Programmed With Incorrect Software, Faulty Cruise 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: U0305 GMC indicates Software Incompatibility With Cruise Control Module.
Common causes: Common causes include Cruise Control Module Programmed With Incorrect Software, Faulty Cruise 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 488

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
FAQs
Comments
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Code U0305 GMC 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 Cruise Control Module is not configured properly.

OBDII Code U0305 GMC - Software Incompatibility With Cruise Control Module - AutoCodes.com — U0305 GMC Code - Software Incompatibility With Cruise Control Module

What does this mean?

What are the Possible Causes of the DTC U0305 GMC?

Cruise Control Module Programmed With Incorrect Software
Faulty Cruise Control Module

How to Fix the DTC U0305 GMC?

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 U0305 GMC 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.

Need more information about the U0305 GMC code?

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Need Help with the Code?

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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 U0305 GMC Code

1. What does the OBDII code U0305 for GMC indicate?

The U0305 code indicates a software incompatibility issue with the cruise control module in a GMC vehicle.

2. What are the common symptoms of the U0305 code in a GMC?

Common symptoms of the U0305 code may include the cruise control system not functioning properly, the cruise control light flashing, or the vehicle going into a reduced power mode.

3. What can cause the U0305 code to trigger in a GMC?

The U0305 code is typically triggered when there is a software mismatch or communication error between the vehicle's onboard computer systems and the cruise control module.

4. How can I diagnose the U0305 code in my GMC?

Diagnosing the U0305 code usually involves using an OBDII scanner to retrieve the code from the vehicle's computer system and then conducting further troubleshooting to pinpoint the exact cause of the software incompatibility.

5. Can I still drive my GMC if the U0305 code is present?

If the U0305 code is triggered, it is generally safe to drive your GMC, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent any potential long-term problems with the cruise control system.

6. How can I repair the U0305 code in my GMC?

Repairing the U0305 code may involve updating the software in the vehicle's control modules, ensuring proper communication between systems, or replacing the cruise control module if necessary.

7. Can I reset the U0305 code in my GMC by disconnecting the battery?

While disconnecting the battery may clear the code temporarily, it is not a guaranteed fix for the underlying software incompatibility issue. It is best to address the root cause of the problem to prevent the code from reoccurring.

8. Is the U0305 code specific to certain GMC models?

The U0305 code can affect various GMC models, especially those equipped with cruise control systems that may experience software communication issues.

9. Will the U0305 code cause my GMC to fail an emissions test?

The U0305 code itself is not directly related to emissions, so it should not cause your GMC to fail an emissions test. However, it is still important to address the code to ensure proper functionality of the cruise control system.

10. Can a DIY enthusiast fix the U0305 code issue in a GMC?

Depending on their skill level and access to diagnostic tools, a DIY enthusiast may be able to address the U0305 code by following repair guides or consulting with professionals for assistance in resolving the software incompatibility issue.