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Engine-Codes – GMC – P3403 2016 GMC Sierra

P3403 2016 GMC Sierra Code - Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage

Quick Answer

The P3403 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Cylinder 1 Deactivation Solenoid Valve Control Circuit registering low voltage. Common causes include Faulty cylinder 1 deactivation solenoid valve, Damaged wiring or connectors in the control circuit, ECM software issues. 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
P3403 2016 GMC Sierra indicates Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage.
Common causes
Common causes include Faulty cylinder 1 deactivation solenoid valve, Damaged wiring or connectors in the control circuit, ECM software issues.
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 13, 2024
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Code P3403 2016 GMC Sierra Description

The P3403 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Cylinder 1 Deactivation Solenoid Valve Control Circuit registering low voltage. This code is specifically tied to the engine's cylinder deactivation system, which is designed to improve fuel efficiency by shutting down specific cylinders when they are not needed, such as during light load conditions. The solenoid valve controls the flow of oil to the lifters that deactivate the cylinders, and when the voltage in the control circuit is too low, it can lead to improper cylinder deactivation.

OBDII Code P3403 2016 GMC Sierra - Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage
P3403 2016 GMC Sierra Code - Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage

Common Causes of P3403 2016 GMC Sierra

  1. Faulty cylinder 1 deactivation solenoid valve
  2. Damaged wiring or connectors in the control circuit
  3. ECM software issues
  4. Low engine oil level or poor oil quality
  5. Mechanical issues with the cylinder deactivation system components

Symptoms of P3403 2016 GMC Sierra

  1. Reduced engine power
  2. Poor fuel economy
  3. Engine misfires or rough idle
  4. Illuminated check engine light
  5. Vehicle may hesitate or stall during acceleration

How to Fix P3403 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the cylinder 1 deactivation solenoid valve, wiring, and connectors for any visible damage or corrosion.
  2. Test the solenoid valve for proper operation using a multimeter to check for continuity and resistance.
  3. Inspect the engine oil level and quality, ensuring it meets manufacturer specifications.
  4. If no issues are found with the solenoid valve or wiring, consider reprogramming or replacing the ECM to address any software-related issues.
  5. Clear the DTC and test drive the vehicle to verify that the repair has resolved the problem.

Cost to Fix P3403 2016 GMC Sierra

The typical repair costs for addressing a P3403 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. Parts such as a new cylinder 1 deactivation solenoid valve or ECM reprogramming may range from $100 to $500, while labor costs could add another $100 to $300. Overall, the total repair cost could fall between $200 and $800. It's important to note that diagnosis time and labor rates at auto repair shops can fluctuate based on various factors, so it's advisable to obtain local estimates for a more accurate cost assessment.

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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 P3403 2016 GMC Sierra Code

1. What does OBDII code P3403 mean on a 2016 GMC Sierra?

Code P3403 indicates a low voltage issue in the Cylinder 1 Deactivation Solenoid Valve Control Circuit, which is part of the Active Fuel Management (AFM) system that deactivates cylinders to improve fuel efficiency.

2. What are the common symptoms of a P3403 code in a 2016 GMC Sierra?

Symptoms may include reduced engine performance, poor fuel economy, an illuminated check engine light, and possible misfire or rough idling.

3. What causes the P3403 code to appear in a 2016 GMC Sierra?

Common causes include a faulty cylinder deactivation solenoid, damaged wiring or connectors in the solenoid circuit, a malfunctioning AFM valve lifter, or a problem with the engine control module (ECM).

4. Can I drive my 2016 GMC Sierra with a P3403 code?

While it may be possible to drive with this code, it's not recommended as it can lead to poor engine performance, reduced efficiency, and potential long-term damage to the AFM system.

5. How do I diagnose a P3403 code on a 2016 GMC Sierra?

Start by inspecting the wiring and connectors for the Cylinder 1 deactivation solenoid for damage or corrosion. Use a scan tool to check for related codes and perform a voltage test on the solenoid circuit.

6. How do I fix the P3403 code on a 2016 GMC Sierra?

Repairs may involve replacing the Cylinder 1 deactivation solenoid, repairing or replacing damaged wiring, cleaning corroded connectors, or updating/reprogramming the ECM if necessary.

7. How much does it cost to fix the P3403 code on a 2016 GMC Sierra?

The repair cost can vary depending on the issue, but replacing the solenoid typically ranges from $150 to $300, including parts and labor.

8. Can a dirty or low oil level cause the P3403 code in a 2016 GMC Sierra?

Yes, low oil levels or dirty oil can affect the performance of the AFM system and the solenoids, potentially triggering the P3403 code.

9. Does the P3403 code always mean the solenoid is bad?

No, the code could also be caused by wiring issues, a faulty ECM, or other related components. Proper diagnosis is essential to identify the root cause.

10. Will clearing the P3403 code fix the issue on my 2016 GMC Sierra?

Clearing the code may turn off the check engine light temporarily, but it won't fix the underlying issue. The problem may reoccur if not properly addressed.

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