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Engine-Codes – GMC – P3427 2015 GMC Sierra

P3427 2015 GMC Sierra Code - Cylinder 4 Deactivation Solenoid Valve Control Circuit Low Voltage

Quick Answer

The P3427 diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically indicates an issue with the Cylinder 4 Deactivation Solenoid Valve Control Circuit registering low voltage. Common causes include Faulty Cylinder 4 Deactivation Solenoid Valve, Wiring issues or damaged connectors in the control circuit, Low engine oil level or poor oil quality. 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
P3427 2015 GMC Sierra indicates Cylinder 4 Deactivation Solenoid Valve Control Circuit Low Voltage.
Common causes
Common causes include Faulty Cylinder 4 Deactivation Solenoid Valve, Wiring issues or damaged connectors in the control circuit, Low engine oil level or poor oil quality.
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 Aug 19, 2024
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Code P3427 2015 GMC Sierra Description

The P3427 diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically indicates an issue with the Cylinder 4 Deactivation Solenoid Valve Control Circuit registering low voltage. This valve is a crucial component of the engine's variable displacement system, which allows the engine to deactivate specific cylinders to improve fuel efficiency and reduce emissions during low-load driving conditions. The solenoid valve controls the flow of oil to activate or deactivate the cylinder, and when the control circuit detects low voltage, it implies a malfunction in the system's operation.

OBDII Code P3427 2015 GMC Sierra - Cylinder 4 Deactivation Solenoid Valve Control Circuit Low Voltage
P3427 2015 GMC Sierra Code - Cylinder 4 Deactivation Solenoid Valve Control Circuit Low Voltage

Common Causes of P3427 2015 GMC Sierra

  1. Faulty Cylinder 4 Deactivation Solenoid Valve
  2. Wiring issues or damaged connectors in the control circuit
  3. Low engine oil level or poor oil quality
  4. ECM software malfunction
  5. Mechanical issues within the variable displacement system

Symptoms of P3427 2015 GMC Sierra

  1. Reduced fuel efficiency
  2. Decreased engine power
  3. Rough idling or engine misfires
  4. Check Engine Light illuminated
  5. Engine may run in reduced power mode

How to Fix P3427 2015 GMC Sierra

  1. Begin by performing a visual inspection of the solenoid valve and its wiring harness to check for any visible damage or corrosion.
  2. Test the solenoid valve with a multimeter to verify if it is functioning within specification.
  3. Inspect the wiring harness and connectors for continuity and repair or replace any damaged components.
  4. Check the engine oil level and quality, ensuring it meets manufacturer specifications.
  5. If the issue persists, consider consulting a professional mechanic or dealership for further diagnostics and potential ECM reprogramming.

Cost to Fix P3427 2015 GMC Sierra

The cost of repairing a P3427 code on a 2015 GMC Sierra could vary depending on the specific cause of the issue. In general, the cost of replacing a faulty solenoid valve or repairing wiring issues could range from $150 to $400, including parts and labor. Additional diagnostic fees may apply, and labor rates at auto repair shops typically range from $80 to $150 per hour. It's advisable to obtain quotes from multiple sources to ensure a competitive price for the repair.

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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 P3427 2015 GMC Sierra Code

1. What does the OBDII code P3427 mean on a 2015 GMC Sierra?

P3427 indicates a low voltage issue in the Cylinder 4 Deactivation Solenoid Valve Control Circuit, which is part of the Active Fuel Management (AFM) system.

2. What are the common symptoms of code P3427 in a GMC Sierra?

Common symptoms include reduced engine performance, poor fuel economy, rough idling, and the Check Engine Light being illuminated.

3. What causes the P3427 code to appear on a 2015 GMC Sierra?

Possible causes include a faulty cylinder deactivation solenoid, damaged wiring or connectors in the circuit, low engine oil pressure, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the P3427 code on my GMC Sierra?

Diagnose the code by using a scan tool to confirm the code, inspecting the Cylinder 4 deactivation solenoid and its wiring for damage, and testing the circuit voltage with a multimeter.

5. Can low engine oil cause the P3427 code in a GMC Sierra?

Yes, low engine oil or poor oil quality can affect the operation of the cylinder deactivation solenoid, triggering the P3427 code.

6. How do I fix the P3427 code on a 2015 GMC Sierra?

Repairs may include replacing the Cylinder 4 deactivation solenoid, repairing or replacing damaged wiring, cleaning connectors, or addressing low oil pressure by changing the oil and filter.

7. Is it safe to drive with the P3427 code on my GMC Sierra?

While it may be possible to drive, continuing to operate the vehicle with this code could lead to further engine issues or damage to the AFM system.

8. How much does it cost to repair the P3427 code on a GMC Sierra?

Repair costs can vary but typically range from $150 to $400, depending on whether the issue is with the solenoid, wiring, or other related components.

9. Can a bad ECM cause the P3427 code in a GMC Sierra?

Yes, a malfunctioning Engine Control Module (ECM) can cause the code if it fails to properly control the Cylinder 4 deactivation solenoid circuit.

10. How can I prevent the P3427 code from recurring on my GMC Sierra?

Regular maintenance, including timely oil changes with the correct oil type and inspecting the AFM system components, can help prevent this code from returning.

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