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Engine-Codes – Generic – C0805

C0805 Code - Control Module Power 2 Circuit

Quick Answer

The C0805 code refers to an issue with the Control Module Power 2 Circuit in the vehicle. Common causes include Faulty Wiring: Damaged or corroded wiring connections can disrupt the power supply to the control module, Blown Fuse: A blown fuse in the power supply circuit can cause the control module to lose power, Malfunctioning Control Module: The control module itself may be faulty and not receiving the necessary 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 indicates Control Module Power 2 Circuit.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring connections can disrupt the power supply to the control module, Blown Fuse: A blown fuse in the power supply circuit can cause the control module to lose power, Malfunctioning Control Module: The control module itself may be faulty and not receiving the necessary 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 09, 2024
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Code C0805 Description

The C0805 code refers to an issue with the Control Module Power 2 Circuit in the vehicle. This code indicates that there is a problem with the power supply to a specific control module in the vehicle, which can lead to various issues with the vehicle's systems and performance. The control module is responsible for regulating and controlling various functions within the vehicle, such as engine management, transmission shifting, and other critical operations.

OBDII Code C0805 - Control Module Power 2 Circuit
C0805 Code - Control Module Power 2 Circuit

Common Causes of C0805

  1. Faulty Wiring: Damaged or corroded wiring connections can disrupt the power supply to the control module.
  2. Blown Fuse: A blown fuse in the power supply circuit can cause the control module to lose power.
  3. Malfunctioning Control Module: The control module itself may be faulty and not receiving the necessary power.
  4. Battery or Charging System Issues: Problems with the vehicle's battery or charging system can impact the power supply to the control module.
  5. Loose Connections: Loose or poor connections between components can lead to power supply issues.

Symptoms of C0805

  1. Check Engine Light: The most common symptom associated with the C0805 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Loss of Power: The vehicle may experience a loss of power or reduced performance due to the compromised control module power supply.
  3. Erratic Behavior: The affected systems may exhibit erratic behavior, such as irregular engine idling or shifting issues.
  4. Electrical Malfunctions: Other electrical components in the vehicle, such as lights or power windows, may not function properly.
  5. Difficulty Starting: The vehicle may have difficulty starting or experience intermittent starting issues.

How to Fix C0805

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific fault codes and pinpoint the exact cause of the Control Module Power 2 Circuit issue.
  2. Inspect Wiring and Connections: Check all wiring and connections related to the control module power supply for any signs of damage, corrosion, or loose connections.
  3. Test Fuses: Inspect and test all fuses in the power supply circuit to ensure they are functioning correctly.
  4. Replace Faulty Components: Replace any damaged wiring, blown fuses, or malfunctioning control modules as needed to restore power to the control module.
  5. Clear Codes and Test: After completing the repairs, clear the fault codes from the vehicle's system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C0805

The typical repair costs for addressing a Control Module Power 2 Circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts and labor for this type of repair can range from $200 to $500. It's important to note that labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local shops for a more accurate estimate of repair costs.

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Code C0805 Information for Specific Makes

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.

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