AutoCodes – GMC – C0805 GMC

C0805 GMC Code - Control Module Power 2 Circuit

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Battery voltage, Faulty Control Module, Control Module harness is open or shorted. 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: C0805 GMC indicates Control Module Power 2 Circuit.
Common causes: Common causes include Battery voltage, Faulty Control Module, Control Module harness is open or shorted.
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 432

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 Jul 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0805 GMC Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Damage to components, and incorrect data can occur when the voltage is out of range. The vehicle has multiple Control Modules that will set this Diagnostic Trouble Code (DTC).

OBDII Code C0805 GMC - Control Module Power 2 Circuit - AutoCodes.com — C0805 GMC Code - Control Module Power 2 Circuit

What does this mean?

What are the Possible Causes of the DTC C0805 GMC?

Battery voltage
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC C0805 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 C0805 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 C0805 GMC code?

Need more information on how to fix the C0805 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0805 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

C0805 2014 GMC Sierra — Control Module Power 2 Circuit
C0805 2015 GMC Sierra — Control Module Power 2 Circuit
C0805 2016 GMC Sierra — Control Module Power 2 Circuit
C0805 2017 GMC Sierra — Control Module Power 2 Circuit
C0805 2018 GMC Sierra — Control Module Power 2 Circuit

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 C0805 GMC Code

1. What are the common symptoms of OBDII code C0805 GMC (Control Module Power 2 Circuit)?

- Common symptoms include issues with the vehicle's electrical system, such as intermittent power loss, dashboard warning lights, and difficulty starting the engine.

2. What are the possible causes of OBDII code C0805 GMC?

- Possible causes of this code may include a faulty control module, damaged wiring or connectors, a blown fuse, or a weak battery.

3. How can I diagnose OBDII code C0805 GMC?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the control module and related components for damage, and testing the electrical circuits for continuity.

4. Can I drive my vehicle with OBDII code C0805 GMC?

- It is not recommended to drive your vehicle with this code present, as it can indicate potential issues with the control module's power supply, which may lead to more serious electrical problems or engine issues.

5. How can I repair OBDII code C0805 GMC?

- Repairing this code may involve replacing a faulty control module, repairing damaged wiring or connectors, checking and replacing any blown fuses, or addressing any underlying battery issues.

6. Is it necessary to reset the OBDII code C0805 GMC after repair?

- Yes, it is important to reset the code after completing the necessary repairs to clear the fault code and reset the vehicle's computer system.

7. What are some tips for preventing OBDII code C0805 GMC from occurring again?

- Regularly inspecting and maintaining your vehicle's electrical system, ensuring proper battery health, and addressing any warning lights or unusual symptoms promptly can help prevent this code from reoccurring.

8. Can a DIY enthusiast repair OBDII code C0805 GMC, or should I seek professional help?

- Depending on your expertise and tools available, you may be able to address this code yourself by following diagnostic steps and repair procedures. However, if you are unsure or uncomfortable, it is recommended to seek professional help.

9. How long does it typically take to repair OBDII code C0805 GMC?

- The repair time for this code can vary depending on the specific cause and extent of the issue. Simple fixes like replacing a blown fuse may take a short time, while diagnosing and repairing a complex wiring problem can take longer.

10. Are there any recalls or service bulletins related to OBDII code C0805 GMC?

- It is advisable to check with your vehicle manufacturer or authorized dealership for any recalls or service bulletins related to this specific OBDII code, as they may offer relevant information or assistance.