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C0805 2018 Chevrolet Silverado Code - Control Module Power 2 Circuit

Quick Answer

The C0805 diagnostic trouble code (DTC) indicates a malfunction in the Control Module Power 2 circuit within the 2018 Chevrolet Silverado. Common causes include Faulty or damaged wiring in the Control Module Power 2 circuit, Blown fuses that interrupt power supply to the control modules, Corroded or loose electrical connectors affecting the circuit's integrity. 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 Chevrolet Silverado indicates Control Module Power 2 Circuit.
Common causes
Common causes include Faulty or damaged wiring in the Control Module Power 2 circuit, Blown fuses that interrupt power supply to the control modules, Corroded or loose electrical connectors affecting the circuit's integrity.
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 Oct 11, 2024
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Code C0805 2018 Chevrolet Silverado Description

The C0805 diagnostic trouble code (DTC) indicates a malfunction in the Control Module Power 2 circuit within the 2018 Chevrolet Silverado. This code typically arises when the vehicle's onboard diagnostic system detects an issue with the power supply to one of the control modules, which can include critical systems such as the engine control module (ECM), transmission control module (TCM), or other essential electronic control units. The Control Module Power 2 circuit is responsible for delivering voltage to these modules, and any disruption can lead to various performance issues.

OBDII Code C0805 2018 Chevrolet Silverado - Control Module Power 2 Circuit
C0805 2018 Chevrolet Silverado Code - Control Module Power 2 Circuit

Common Causes of C0805 2018 Chevrolet Silverado

  1. Faulty or damaged wiring in the Control Module Power 2 circuit.
  2. Blown fuses that interrupt power supply to the control modules.
  3. Corroded or loose electrical connectors affecting the circuit's integrity.
  4. A malfunctioning control module that fails to receive or process power correctly.
  5. Short circuits caused by damaged insulation or exposure to moisture.

Symptoms of C0805 2018 Chevrolet Silverado

  1. Engine misfires or stalling.
  2. Transmission shifting issues, such as harsh or delayed shifts.
  3. Warning lights illuminated on the dashboard, including the check engine light.
  4. Inoperative features related to electronic control modules, such as ABS or traction control.
  5. Reduced fuel efficiency or erratic fuel gauge readings.

How to Fix C0805 2018 Chevrolet Silverado

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring harness, connectors, and fuses related to the Control Module Power 2 circuit. Look for signs of damage, corrosion, or loose connections.
  2. Test Voltage Supply: Use a multimeter to check for proper voltage at the control module and along the power circuit. This will help identify any breaks in the circuit or areas where voltage is not being supplied.
  3. Repair or Replace Wiring: If damaged wiring or connectors are found, repair or replace them as necessary to ensure a solid electrical connection.
  4. Replace Blown Fuses: If any fuses are found to be blown, replace them and recheck the system to see if the issue persists.
  5. Control Module Testing: If the circuit appears intact and the issue continues, the control module itself may need to be tested or replaced, as it could be malfunctioning.

Cost to Fix C0805 2018 Chevrolet Silverado

The cost to diagnose and repair the C0805 code can vary widely based on the specific issue and the labor rates in your area. Typically, you might expect to pay between $150 and $500 for repairs, including parts and labor. This estimate includes potential costs for wiring repairs, fuse replacements, and control module testing or replacement. Diagnosis time can range from 1 to 2 hours, and labor rates at auto repair shops generally fall between $80 and $150 per hour. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. It is advisable to check local repair shops for precise estimates tailored to your specific situation.

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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 Chevrolet Silverado Code

1. What does the OBDII code C0805 mean on a 2018 Chevrolet Silverado?

The C0805 code indicates an issue with the Control Module Power 2 Circuit, suggesting a problem with the power supply to one of the vehicle's control modules.

2. What are common symptoms of the C0805 code in a 2018 Silverado?

Common symptoms include warning lights on the dashboard, intermittent electrical issues, or certain systems like ABS or traction control not functioning correctly.

3. What causes the C0805 code to appear on a Chevrolet Silverado?

The code can be triggered by issues like loose or corroded wiring, a blown fuse, a faulty control module, or a weak battery.

4. How can I diagnose the C0805 code on my 2018 Silverado?

Start by checking the wiring and connectors for corrosion or damage, test the relevant fuses, and ensure the battery voltage is within the proper range.

5. Can a weak battery cause the C0805 code in a Chevy Silverado?

Yes, a weak or failing battery can result in insufficient power to the control module, triggering the C0805 code.

6. Is it safe to drive with the C0805 code on a 2018 Chevrolet Silverado?

It’s not recommended, as the code may indicate critical power supply issues, potentially affecting important vehicle systems like brakes or steering.

7. How do I fix the C0805 code on my 2018 Silverado?

Repairs may include replacing damaged wiring, cleaning corroded connectors, replacing a blown fuse, or addressing a failing control module or battery.

8. What tools are needed to troubleshoot the C0805 code?

You’ll need an OBDII scanner, a multimeter to test voltage and continuity, and possibly wiring diagrams for your Silverado.

9. Can a software issue cause the C0805 code?

In rare cases, a software glitch in the control module could cause the code, requiring a module reprogramming or update from a dealership.

10. How much does it cost to repair the C0805 code on a 2018 Chevrolet Silverado?

Repair costs vary depending on the issue but may range from $50 for a fuse replacement to several hundred dollars if a control module or extensive wiring repairs are needed.

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