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Engine-Codes – GMC – P3451 2016 GMC Sierra

P3451 2016 GMC Sierra Code - Cylinder 7 Deactivation Solenoid Valve Control Circuit Low Voltage

Quick Answer

The P3451 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Cylinder 7 Deactivation Solenoid Valve Control Circuit registering low voltage. Common causes include Faulty cylinder deactivation solenoid valve, Wiring issues or poor electrical connections in the control circuit, Malfunctioning engine control module (ECM). 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
P3451 2016 GMC Sierra indicates Cylinder 7 Deactivation Solenoid Valve Control Circuit Low Voltage.
Common causes
Common causes include Faulty cylinder deactivation solenoid valve, Wiring issues or poor electrical connections in the control circuit, Malfunctioning engine control module (ECM).
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 15, 2024
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Code P3451 2016 GMC Sierra Description

The P3451 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Cylinder 7 Deactivation Solenoid Valve Control Circuit registering low voltage. In vehicles equipped with cylinder deactivation technology, such as GM's Active Fuel Management (AFM) system, certain cylinders can be deactivated during light load conditions to improve fuel efficiency. The deactivation solenoid valve controls the flow of oil to the lifters to enable or disable cylinder deactivation. When the control circuit for the solenoid valve detects low voltage, it indicates a potential issue with the system's ability to properly deactivate cylinder 7.

OBDII Code P3451 2016 GMC Sierra - Cylinder 7 Deactivation Solenoid Valve Control Circuit Low Voltage
P3451 2016 GMC Sierra Code - Cylinder 7 Deactivation Solenoid Valve Control Circuit Low Voltage

Common Causes of P3451 2016 GMC Sierra

  1. Faulty cylinder deactivation solenoid valve.
  2. Wiring issues or poor electrical connections in the control circuit.
  3. Malfunctioning engine control module (ECM).
  4. Low engine oil level or pressure affecting the solenoid valve operation.
  5. Mechanical issues within the engine impacting oil flow to the solenoid valve.

Symptoms of P3451 2016 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Reduced fuel efficiency.
  3. Rough idling or vibrations while driving.
  4. Engine misfires.
  5. Decreased engine power under certain driving conditions.

How to Fix P3451 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness and connectors associated with the cylinder 7 deactivation solenoid valve control circuit.
  2. Test the solenoid valve for proper operation and replace it if found to be faulty.
  3. Check the engine oil level and pressure to ensure they meet manufacturer specifications.
  4. Scan the ECM for any stored fault codes and address any related issues.
  5. Clear the DTC and perform a test drive to verify that the repair has resolved the problem.

Cost to Fix P3451 2016 GMC Sierra

The typical repair costs for addressing a P3451 DTC on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty solenoid valve or addressing wiring faults may range from $150 to $400, including parts and labor. Additional costs may apply if further diagnosis or repairs are needed. It's advisable to consult with a qualified mechanic or auto repair shop to obtain an accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary between different locations and service providers, so it's recommended to inquire about local rates for a more precise cost estimate.

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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 P3451 2016 GMC Sierra Code

1. What does OBDII code P3451 mean for a 2016 GMC Sierra?

P3451 indicates a low voltage issue in the Cylinder 7 Deactivation Solenoid Valve Control Circuit, which is part of the Active Fuel Management (AFM) system.

2. What are the symptoms of code P3451 in a 2016 GMC Sierra?

Common symptoms include poor engine performance, reduced fuel efficiency, the Check Engine Light turning on, or the engine running rough.

3. What causes code P3451 to appear?

Potential causes include a faulty Cylinder 7 deactivation solenoid, wiring issues like damaged or corroded connectors, a malfunctioning ECM, or low engine oil pressure.

4. Can low engine oil cause code P3451?

Yes, low engine oil pressure or dirty oil can prevent proper operation of the deactivation solenoid, triggering this code.

5. How do I diagnose code P3451 on my GMC Sierra?

Start by checking the solenoid wiring and connectors for damage or corrosion, verify proper oil levels and pressure, and test the solenoid for functionality using a multimeter.

6. Is it safe to drive a 2016 GMC Sierra with code P3451?

Driving with this code is not recommended, as it may lead to further engine damage or performance issues if left unresolved.

7. How do I fix code P3451 on a 2016 GMC Sierra?

Repairs may include replacing the Cylinder 7 deactivation solenoid, repairing or replacing damaged wiring, cleaning connectors, or addressing low oil pressure.

8. Can a bad ECM cause code P3451?

While less common, a faulty ECM (Engine Control Module) can cause this code by failing to properly control the solenoid circuit.

9. How much does it cost to fix code P3451 on a GMC Sierra?

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

10. How do I prevent code P3451 from recurring?

Regular oil changes, maintaining proper oil levels, and inspecting wiring and connectors for damage can help prevent this code from returning.

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