AutoCodes – Generic – C0805

C0805 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 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 522

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

What does this mean?

What are the Possible Causes of the DTC C0805?

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

How to Fix the DTC C0805?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

C0805 Buick — Control Module Power 2 Circuit
C0805 Cadillac — Control Module Power 2 Circuit
C0805 Chevrolet — Control Module Power 2 Circuit
C0805 GMC — 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 Code

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

- Common symptoms include issues with the vehicle's electrical systems, such as dashboard warning lights, power door locks malfunctioning, or problems with the radio.

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

- The code C0805 can be caused by a faulty control module, damaged wiring or connectors, a blown fuse, or issues with the power supply to the module.

3. How can I diagnose the cause of OBDII code C0805?

- Diagnosing this code typically involves checking the wiring and connectors for damage, testing the power supply to the control module, and using a diagnostic scanner to retrieve additional fault codes.

4. Can OBDII code C0805 be fixed at home?

- Depending on the cause, some DIY enthusiasts may be able to address this code by checking and repairing damaged wiring, replacing fuses, or resetting the control module.

5. Is it safe to continue driving with OBDII code C0805 present?

- It is not recommended to drive with this code unresolved, as it can lead to further electrical problems and potentially affect the vehicle's performance and safety systems.

6. How much does it typically cost to repair OBDII code C0805?

- The cost of repairing this code can vary depending on the cause and whether you choose to DIY or seek professional help. Costs may include parts, labor, and diagnostic fees.

7. Can OBDII code C0805 cause other issues in the vehicle?

- Yes, if left unresolved, OBDII code C0805 can potentially lead to other electrical problems in the vehicle, affecting various control modules and systems.

8. What are some repair tips for fixing OBDII code C0805?

- Some repair tips include checking the control module power supply, inspecting wiring for damage, ensuring connectors are secure, and consulting the vehicle's service manual for specific troubleshooting steps.

9. Will resetting the OBDII system clear code C0805?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

10. How urgent is it to address OBDII code C0805?

- It is recommended to address OBDII code C0805 promptly to prevent further electrical issues and ensure the proper functioning of the vehicle's control modules.