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C0805 2018 GMC Sierra Code - Control Module Power 2 Circuit

Quick Answer

The C0805 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Control Module Power 2 Circuit. Common causes include Faulty wiring or connectors in the Control Module Power 2 Circuit, A blown fuse related to the circuit, A malfunctioning control module that is drawing too much power. 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 2018 GMC Sierra indicates Control Module Power 2 Circuit.
Common causes
Common causes include Faulty wiring or connectors in the Control Module Power 2 Circuit, A blown fuse related to the circuit, A malfunctioning control module that is drawing too much power.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code C0805 2018 GMC Sierra Description

The C0805 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Control Module Power 2 Circuit. This code indicates that there is a malfunction in the circuit that supplies power to a specific control module in the vehicle. Control modules are electronic components that manage various systems in the vehicle, such as the engine, transmission, and emissions control. The Control Module Power 2 Circuit is responsible for providing power to a secondary control module, which could be related to systems like the airbag module, body control module, or transmission control module.

OBDII Code C0805 2018 GMC Sierra - Control Module Power 2 Circuit
C0805 2018 GMC Sierra Code - Control Module Power 2 Circuit

Common Causes of C0805 2018 GMC Sierra

  1. Faulty wiring or connectors in the Control Module Power 2 Circuit.
  2. A blown fuse related to the circuit.
  3. A malfunctioning control module that is drawing too much power.
  4. Water or corrosion damage to the circuit components.
  5. Issues with the vehicle's battery or charging system affecting power delivery.

Symptoms of C0805 2018 GMC Sierra

  1. Illumination of the check engine light on the dashboard.
  2. Loss of power steering assistance.
  3. Inoperative power windows or door locks.
  4. Transmission shifting issues.
  5. Airbag warning light activation.

How to Fix C0805 2018 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the wiring and connectors in the Control Module Power 2 Circuit to check for any obvious signs of damage or corrosion.
  2. Test the fuses related to the circuit to determine if any are blown and replace them if necessary.
  3. Use a multimeter to check the voltage levels in the circuit and ensure that power is reaching the control module.
  4. If the issue persists, consider replacing the control module itself, as it may be malfunctioning and causing the power supply problem.
  5. Clear the DTC from the vehicle's computer system using a diagnostic scanner after completing the repairs to reset the check engine light.

Cost to Fix C0805 2018 GMC Sierra

The cost of repairing a Control Module Power 2 Circuit issue can vary depending on the specific cause of the problem and the parts required for the repair. On average, the cost of parts for this repair could range from $100 to $500, with labor costs adding an additional $100 to $300. Keep in mind that these are rough estimates, and actual costs may vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It is recommended to obtain quotes from local auto repair shops to get a more accurate cost estimate for this repair.

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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 C0805 2018 GMC Sierra Code

1. What does the OBDII code C0805 mean on a 2018 GMC Sierra?

Code C0805 indicates an issue with the "Control Module Power 2 Circuit," meaning the control module is not receiving the proper power supply or has a circuit fault.

2. What are the common symptoms of the C0805 code in a GMC Sierra?

Symptoms may include warning lights on the dashboard, failure of certain electrical components, reduced vehicle performance, or intermittent issues with electronic systems.

3. What causes the C0805 code to appear on a 2018 GMC Sierra?

Common causes include a blown fuse, damaged wiring, faulty connections, a failing control module, or issues with the vehicle's power distribution system.

4. How do I diagnose a C0805 code on my GMC Sierra?

Start by checking the fuses, inspecting the wiring and connectors for damage or corrosion, and using a multimeter to test for proper voltage at the control module.

5. Can I continue driving my GMC Sierra with the C0805 code?

It’s not recommended to drive for an extended period with this code, as it may lead to further electrical system failures or reduced vehicle functionality.

6. How is the C0805 code usually fixed?

Repairs typically involve replacing blown fuses, repairing or replacing damaged wiring, cleaning corroded connections, or replacing a malfunctioning control module.

7. Does the C0805 code cause other problems in the GMC Sierra?

If unresolved, this code can lead to additional electrical system malfunctions or prevent critical systems from functioning properly.

8. What tools do I need to troubleshoot the C0805 code?

You’ll need an OBDII scanner, a multimeter for voltage testing, and basic tools for inspecting or replacing wiring and fuses.

9. How much does it cost to fix the C0805 code on a GMC Sierra?

Costs can vary widely depending on the issue, ranging from $10–$50 for a fuse replacement to $300–$800 or more for a new control module.

10. Can a weak battery cause the C0805 code on a 2018 GMC Sierra?

Yes, a weak or failing battery can result in insufficient power to the control module and trigger the C0805 code. Always check the battery health as part of the diagnosis.

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