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P3443 2015 GMC Sierra Code - Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage

Quick Answer

The P3443 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem 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 2015 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 08, 2024
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Code P3443 2015 GMC Sierra Description

The P3443 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the Cylinder 6 Deactivation Solenoid Valve Control Circuit experiencing low voltage. In vehicles equipped with cylinder deactivation technology, such as Active Fuel Management (AFM) or Variable Cylinder Management (VCM), the engine is designed to deactivate certain cylinders under light load conditions to improve fuel efficiency. The solenoid valve controls this process by regulating oil flow to the lifters that deactivate the cylinders.

OBDII Code P3443 2015 GMC Sierra - Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage
P3443 2015 GMC Sierra Code - Cylinder 6 Deactivation Solenoid Valve Control Circuit Low Voltage

Common Causes of P3443 2015 GMC Sierra

  1. Faulty Cylinder 6 Deactivation Solenoid Valve
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning PCM
  4. Low oil pressure in the system
  5. Electrical issues such as shorts or open circuits

Symptoms of P3443 2015 GMC Sierra

  1. Decreased fuel efficiency
  2. Engine misfires or rough idle
  3. Loss of power or acceleration
  4. Illumination of the check engine light
  5. Engine overheating in severe cases

How to Fix P3443 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the Cylinder 6 Deactivation Solenoid Valve, wiring, and connectors to identify any visible damage or issues.
  2. Test the solenoid valve and control circuit using a multimeter to check for proper voltage and continuity.
  3. If necessary, replace the faulty solenoid valve or repair any damaged wiring or connectors in the control circuit.
  4. Clear the DTC from the PCM memory using a scan tool and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the root cause, such as checking the oil pressure in the system or testing the PCM for faults.

Cost to Fix P3443 2015 GMC Sierra

The typical repair costs for resolving a P3443 DTC on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty solenoid valve or repairing damaged wiring may cost between $150 and $300 for parts, with additional labor costs ranging from $100 to $300. However, prices may fluctuate based on the location of the repair shop, the vehicle's make and model, and the complexity of the repair process. Additionally, diagnosis time and labor rates can vary, with hourly rates typically falling between $80 and $150. It's advisable to consult with local auto repair shops for a more accurate estimate tailored to your specific circumstances.

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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 2015 GMC Sierra Code

1. What does the OBDII code P3443 mean on a 2015 GMC Sierra?

P3443 indicates a low voltage issue in the Cylinder 6 Deactivation Solenoid Valve Control Circuit, which is part of the Active Fuel Management (AFM) system.

2. What are the common symptoms of code P3443 on a GMC Sierra?

Symptoms include reduced engine performance, poor fuel economy, illumination of the Check Engine Light, and potential misfiring or rough idling.

3. What causes P3443 to appear on a 2015 GMC Sierra?

Common causes include a faulty Cylinder 6 deactivation solenoid, damaged wiring or connectors in the control circuit, low oil pressure, or a malfunctioning PCM (Powertrain Control Module).

4. Can low oil levels cause the P3443 code?

Yes, insufficient oil levels or low oil pressure can prevent the AFM system from functioning properly, potentially triggering the P3443 code.

5. How do I diagnose the P3443 code on my GMC Sierra?

Start by checking the wiring and connectors for damage or corrosion, inspect the solenoid for proper operation, verify oil levels and pressure, and use a multimeter to test for proper voltage in the control circuit.

6. Is it safe to drive with the P3443 code active?

Driving with the P3443 code may cause reduced performance and worsen engine wear. It’s best to address the issue promptly to avoid further damage.

7. How do I fix the P3443 code on a 2015 GMC Sierra?

Repairs may include replacing the Cylinder 6 deactivation solenoid, repairing damaged wiring or connectors, addressing oil pressure issues, or reprogramming the PCM if necessary.

8. How much does it cost to fix the P3443 code on a GMC Sierra?

Repair costs vary, but replacing a deactivation solenoid typically costs $150-$300, while wiring repairs or PCM reprogramming may add to the expense.

9. Can a bad PCM cause the P3443 code on a 2015 GMC Sierra?

Yes, although less common, a malfunctioning PCM can fail to properly control the solenoid and trigger the P3443 code.

10. Does the P3443 code always mean the solenoid is bad?

Not necessarily. The issue could also stem from wiring problems, oil pressure issues, or a fault in the PCM. Proper diagnosis is essential.

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