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Engine-Codes – GMC – P3403 2018 GMC Sierra

P3403 2018 GMC Sierra Code - Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage

Quick Answer

The P3403 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Cylinder 1 Deactivation Solenoid Valve Control Circuit registering low voltage. Common causes include Faulty cylinder 1 deactivation solenoid valve, Wiring or connection issues in the control circuit, Corrosion or damage to electrical connectors. 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 2018 GMC Sierra indicates Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage.
Common causes
Common causes include Faulty cylinder 1 deactivation solenoid valve, Wiring or connection issues in the control circuit, Corrosion or damage to electrical connectors.
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 14, 2024
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Code P3403 2018 GMC Sierra Description

The P3403 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Cylinder 1 Deactivation Solenoid Valve Control Circuit registering low voltage. This code indicates that there is an issue with the control circuit responsible for activating and deactivating the cylinder 1 deactivation solenoid valve. In vehicles equipped with cylinder deactivation technology, such as GM's Active Fuel Management (AFM) system, certain cylinders can be shut off during light load conditions to improve fuel efficiency. The solenoid valve controls the flow of oil to the lifters, which in turn deactivate the valves in the affected cylinders.

OBDII Code P3403 2018 GMC Sierra - Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage
P3403 2018 GMC Sierra Code - Cylinder 1 Deactivation Solenoid Valve Control Circuit Low Voltage

Common Causes of P3403 2018 GMC Sierra

  1. Faulty cylinder 1 deactivation solenoid valve
  2. Wiring or connection issues in the control circuit
  3. Corrosion or damage to electrical connectors
  4. ECM (Engine Control Module) software issues
  5. Low engine oil pressure

Symptoms of P3403 2018 GMC Sierra

  1. Reduced engine performance or power
  2. Poor fuel economy
  3. Rough idling or engine misfires
  4. Illumination of the check engine light
  5. Increased emissions output

How to Fix P3403 2018 GMC Sierra

  1. Begin by inspecting the wiring and connectors related to the cylinder 1 deactivation solenoid valve control circuit for any damage or corrosion. Repair or replace as necessary.
  2. Test the cylinder 1 deactivation solenoid valve itself to ensure it is functioning correctly. Replace if faulty.
  3. Check the engine oil level and pressure to ensure they are within the manufacturer's specifications.
  4. Clear the DTC from the vehicle's ECM 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 exact cause, such as checking the ECM for software updates or potential internal faults.

Cost to Fix P3403 2018 GMC Sierra

The typical repair costs for addressing a P3403 DTC on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, parts such as a new cylinder 1 deactivation solenoid valve or wiring harness may range from $100 to $300, while labor costs can add another $100 to $200. Overall, the total repair bill could fall within the $200 to $500 range. It's important to note that diagnosis time and labor rates at auto repair shops can fluctuate, so it's advisable to check with local providers for a more accurate 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 P3403 2018 GMC Sierra Code

1. What does the OBDII code P3403 mean on a 2018 GMC Sierra?

P3403 indicates a problem with the Cylinder 1 Deactivation Solenoid Valve Control Circuit, specifically low voltage detected in the circuit.

2. What are the symptoms of code P3403 in a 2018 GMC Sierra?

Common symptoms include a check engine light, reduced engine performance, poor fuel economy, rough idling, and difficulty switching to or from Active Fuel Management (AFM) mode.

3. What causes the P3403 code to appear?

Possible causes include a faulty Cylinder 1 Deactivation Solenoid, damaged wiring or connectors in the solenoid circuit, low oil pressure, contaminated oil, or an issue with the Engine Control Module (ECM).

4. Can low oil pressure cause the P3403 code?

Yes, low oil pressure or dirty oil can impair the operation of the Cylinder 1 Deactivation Solenoid, potentially triggering the P3403 code.

5. How do I diagnose the P3403 code on my GMC Sierra?

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

6. How do I fix the P3403 code on a 2018 GMC Sierra?

Repairs may include replacing the Cylinder 1 Deactivation Solenoid, repairing or replacing damaged wiring, cleaning or replacing the oil, or reprogramming the ECM if necessary.

7. Is it safe to drive with the P3403 code active?

While the vehicle may remain operable, driving with the P3403 code active can lead to reduced performance and potential engine damage if the issue is not addressed.

8. How much does it cost to repair the P3403 code on a GMC Sierra?

Repair costs vary, but replacing the Cylinder 1 Deactivation Solenoid typically ranges from $150 to $400, including parts and labor. Wiring repairs or ECM reprogramming may cost more.

9. Can a faulty ECM cause the P3403 code?

Yes, although rare, a malfunctioning ECM can fail to properly manage the solenoid circuit, leading to the P3403 code.

10. How can I prevent the P3403 code from occurring?

Regular maintenance, such as timely oil changes with the correct grade of oil and inspecting wiring for damage, can help prevent issues with the Cylinder 1 Deactivation Solenoid.

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