How much does it cost to fix P3400?

Typical repair cost is $100–$800.

P3400 — Cylinder Deactivation System Bank 1

Medium Severity · Engine

OBD-II code P3400 means your vehicle's ECU detected: Cylinder Deactivation System Bank 1. Below: causes, step-by-step fixes, and repair cost — free, no signup needed.

Drivable short-term but schedule a diagnosis soon. Prolonged driving can worsen the issue.

Typical Repair Cost

$100–$800

Parts + labor, national average

Severity

Medium

Schedule repair soon

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Common Causes of P3400

Low oil pressure
Failed lifter oil actuator solenoid (LOAS)
Worn lifters

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How to Fix Code P3400

Check oil level/pressure

Replace LOAS solenoid ($100–$300)

Inspect lifters if solenoid OK

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FAQ — Code P3400

What does OBD-II code P3400 mean?

P3400 means your vehicle's onboard computer detected: Cylinder Deactivation System Bank 1. This is a medium-severity code in the Engine category.

How much does it cost to fix code P3400?

Typical repair cost for P3400 is $100–$800 including parts and labor. Costs vary by vehicle make, model, and location. A free scan at AutoZone or O'Reilly is a good first step.

Can I drive my car with code P3400?

Code P3400 is generally safe for short trips, but have it diagnosed soon to prevent the problem from worsening.

What are the most common causes of P3400?

The most common causes are: Low oil pressure, Failed lifter oil actuator solenoid (LOAS), Worn lifters. Always start with the cheapest diagnosis step before replacing parts.

Will code P3400 clear itself?

Code P3400 will clear itself after the underlying issue is fixed and the ECU completes several successful drive cycles. Clearing it without fixing the root cause only masks the problem temporarily.

Is P3400 showing on your car?

Enter your VIN for a free vehicle-specific report — recalls, specs, and market value. No signup required.

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OBD-II code data is based on SAE J2012 standards and general repair industry data. Repair costs are national averages and vary by vehicle, location, and shop. Always consult a qualified mechanic for a diagnosis specific to your vehicle.