Engine-CodesGMC – C0805 2017 GMC Sierra

C0805 2017 GMC Sierra Code - Control Module Power 2 Circuit

Quick Answer

The C0805 diagnostic trouble code for a 2017 GMC Sierra relates to the Control Module Power 2 Circuit. Common causes include Faulty Wiring: Damaged or corroded wiring in the Control Module Power 2 Circuit can disrupt the power supply to the control module, Blown Fuse: A blown fuse in the circuit can prevent the control module from receiving the necessary power, Faulty Control Module: A malfunctioning control module itself can trigger the C0805 code, indicating internal issues. 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 2017 GMC Sierra indicates Control Module Power 2 Circuit.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the Control Module Power 2 Circuit can disrupt the power supply to the control module, Blown Fuse: A blown fuse in the circuit can prevent the control module from receiving the necessary power, Faulty Control Module: A malfunctioning control module itself can trigger the C0805 code, indicating internal issues.
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.
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code C0805 2017 GMC Sierra Description

The C0805 diagnostic trouble code for a 2017 GMC Sierra relates to the Control Module Power 2 Circuit. This code indicates that there is a malfunction in the power circuit for a specific control module in the vehicle. The control module is responsible for managing various systems within the vehicle, such as the engine, transmission, and emissions control. When the power circuit for this module is compromised, it can lead to a range of issues affecting the vehicle's performance.

OBDII Code C0805 2017 GMC Sierra - Control Module Power 2 Circuit
C0805 2017 GMC Sierra Code - Control Module Power 2 Circuit

Common Causes of C0805 2017 GMC Sierra

  1. Faulty Wiring: Damaged or corroded wiring in the Control Module Power 2 Circuit can disrupt the power supply to the control module.
  2. Blown Fuse: A blown fuse in the circuit can prevent the control module from receiving the necessary power.
  3. Faulty Control Module: A malfunctioning control module itself can trigger the C0805 code, indicating internal issues.
  4. Poor Ground Connection: A poor ground connection can lead to voltage irregularities in the circuit, affecting the control module's operation.
  5. Battery Issues: Low battery voltage or a failing battery can impact the power supply to the control module, triggering the code.

Symptoms of C0805 2017 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the C0805 code is the illumination of the check engine light on the dashboard.
  2. Engine Misfires: The vehicle may experience engine misfires or rough idling due to the disrupted power supply to the control module.
  3. Transmission Issues: The transmission may shift erratically or experience delays in response, affecting the vehicle's overall performance.
  4. Reduced Fuel Efficiency: A faulty Control Module Power 2 Circuit can lead to decreased fuel efficiency as the engine may not be operating optimally.
  5. Loss of Power: The vehicle may exhibit a loss of power during acceleration or while driving, impacting its overall drivability.

How to Fix C0805 2017 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the specific cause of the C0805 code.
  2. Inspect Wiring: Check the wiring in the Control Module Power 2 Circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Check Fuses: Inspect the fuses related to the control module power circuit and replace any blown fuses.
  4. Test Control Module: Test the control module for any internal faults or malfunctions. Replace if necessary.
  5. Verify Ground Connection: Ensure that the ground connection for the control module is secure and functioning correctly to provide a stable power supply.

Cost to Fix C0805 2017 GMC Sierra

The typical repair costs for addressing a Control Module Power 2 Circuit issue like the C0805 code can range from $200 to $500, including parts and labor. However, it's essential to note that actual costs can vary based on factors such as the location of the repair shop, the specific make and model of the vehicle, and the extent of the damage. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. It's advisable to obtain quotes from local shops for a more accurate estimate of the repair costs.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code C0805 in a 2017 GMC Sierra related to the Control Module Power 2 Circuit?

- Common symptoms include the illumination of the check engine light, loss of power steering assist, and potential issues with the vehicle's electronic systems.

2. What are some possible causes of OBDII code C0805 in a 2017 GMC Sierra?

- Possible causes may include a faulty power steering control module, damaged wiring or connectors in the power steering system, or a malfunctioning power steering motor.

3. How can I diagnose OBDII code C0805 in my 2017 GMC Sierra?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the power steering system components, and testing the power steering control module and related circuits.

4. Is it safe to continue driving my 2017 GMC Sierra with OBDII code C0805?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to potential safety issues and further damage to the power steering system.

5. How can I repair OBDII code C0805 in my 2017 GMC Sierra?

- Repairing this code may involve replacing the power steering control module, repairing any damaged wiring or connectors, or addressing any issues with the power steering motor.

6. Can a DIY enthusiast fix OBDII code C0805 in a 2017 GMC Sierra?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing OBDII code C0805 may require specialized tools and expertise best handled by a professional mechanic.

7. How much does it typically cost to repair OBDII code C0805 in a 2017 GMC Sierra?

- The cost of repairing this code can vary depending on the specific issue causing it, but it may range from a few hundred dollars for minor repairs to over a thousand dollars for more complex issues.

8. Will resetting the OBDII code C0805 in my 2017 GMC Sierra make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, it is likely to reappear once the vehicle is driven again.

9. Can extreme weather conditions affect the occurrence of OBDII code C0805 in a 2017 GMC Sierra?

- Yes, extreme temperatures or weather conditions can potentially impact the performance of the power steering system and contribute to the triggering of OBDII code C0805.

10. Is OBDII code C0805 a common issue in 2017 GMC Sierra vehicles?

- While not as common as some other OBDII codes, C0805 related to the Control Module Power 2 Circuit can still occur in 2017 GMC Sierra vehicles due to various factors affecting the power steering system.

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