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Engine-Codes – GMC – P3443 2018 GMC Sierra

P3443 2018 GMC Sierra Code - Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage

Quick Answer

The P3443 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Cylinder 6 Deactivation Solenoid Valve Control Circuit experiencing low voltage. Common causes include Faulty Cylinder 6 Deactivation Solenoid Valve, Damaged wiring or connectors in the control circuit, Malfunctioning PCM. 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
P3443 2018 GMC Sierra indicates Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage.
Common causes
Common causes include Faulty Cylinder 6 Deactivation Solenoid Valve, Damaged wiring or connectors in the control circuit, Malfunctioning PCM.
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 10, 2024
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Code P3443 2018 GMC Sierra Description

The P3443 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Cylinder 6 Deactivation Solenoid Valve Control Circuit experiencing low voltage. In vehicles equipped with cylinder deactivation technology, certain cylinders can be shut down to improve fuel efficiency under light load conditions. The solenoid valve controls the activation and deactivation of these cylinders. When the control circuit for the solenoid valve detects low voltage, it indicates a problem with the electrical system that could potentially impact the engine's performance.

OBDII Code P3443 2018 GMC Sierra - Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage
P3443 2018 GMC Sierra Code - Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage

Common Causes of P3443 2018 GMC Sierra

  1. Faulty Cylinder 6 Deactivation Solenoid Valve
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning PCM
  4. Mechanical issues within the cylinder deactivation system
  5. Electrical system problems

Symptoms of P3443 2018 GMC Sierra

  1. Check Engine Light illuminated on the dashboard
  2. Engine misfires or rough idling
  3. Reduced fuel efficiency
  4. Loss of power or acceleration
  5. Engine stalling or hesitation

How to Fix P3443 2018 GMC Sierra

  1. Begin by inspecting the wiring and connectors in the control circuit for any damage or loose connections.
  2. Test the Cylinder 6 Deactivation Solenoid Valve for proper operation and replace it if necessary.
  3. Check the PCM for any faults or reprogramming requirements.
  4. Verify the mechanical components of the cylinder deactivation system for any issues.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P3443 2018 GMC Sierra

The typical repair costs for addressing a P3443 code on a 2018 GMC Sierra can vary depending on the exact cause of the issue and the specific parts and labor required. On average, the cost for parts could range from $100 to $300, with additional labor costs of $100 to $200. However, it's essential to note that diagnosis time and labor rates can vary widely depending on factors such as location, vehicle make and model, and the technician's expertise. It's recommended to inquire with local auto repair shops for more accurate estimates.

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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 P3443 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P3443 in a 2018 GMC Sierra?

- Common symptoms include engine misfires, rough idling, reduced fuel efficiency, and the Check Engine light illuminating.

2. What does the OBDII code P3443 indicate in a 2018 GMC Sierra?

- The code P3443 indicates a low voltage condition in the control circuit of the Cylinder 6 Deactivation Solenoid Valve.

3. What are the possible causes of OBDII code P3443 in a 2018 GMC Sierra?

- Possible causes include a faulty Cylinder 6 Deactivation Solenoid Valve, damaged wiring or connectors, low engine oil levels, or an issue with the engine control module.

4. How can I diagnose the Cylinder 6 Deactivation Solenoid Valve in a 2018 GMC Sierra?

- You can use a multimeter to test the resistance of the solenoid valve and check for proper voltage supply to the valve. Inspect the wiring and connectors for any signs of damage.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P3443?

- It is not recommended to continue driving with this code as it can lead to further engine issues and potential damage. It's best to address the problem promptly.

6. How can I repair OBDII code P3443 in my 2018 GMC Sierra?

- Repair options include replacing the faulty Cylinder 6 Deactivation Solenoid Valve, repairing any damaged wiring or connectors, ensuring proper engine oil levels, and resetting the trouble codes.

7. Is it possible to reset the OBDII code P3443 in a 2018 GMC Sierra without fixing the issue?

- While you can clear the code using an OBDII scanner, it's crucial to address the underlying problem to prevent future issues and ensure the vehicle's proper functioning.

8. Can a DIY enthusiast fix OBDII code P3443 in a 2018 GMC Sierra?

- Depending on your mechanical skills and access to tools, some DIY enthusiasts may be able to address this code by replacing the solenoid valve or repairing wiring. However, professional help is recommended for accurate diagnosis and repair.

9. How much does it typically cost to repair OBDII code P3443 in a 2018 GMC Sierra?

- The cost can vary depending on the exact cause of the issue, but it may range from $100 to $400 for parts and labor, including the solenoid valve replacement or wiring repairs.

10. Will OBDII code P3443 cause permanent damage to my 2018 GMC Sierra if left untreated?

- Ignoring code P3443 can lead to potential engine damage over time due to misfires and inefficient operation. It's best to address the issue promptly to prevent any lasting harm to the vehicle.

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