P3404Cylinder Deactivation (AFM/DoD)

Cylinder 1 Deactivation/Intake Valve Control Circuit High

P3404 indicates a high voltage or open condition in the cylinder 1 deactivation / intake valve control circuit. Typically an open circuit or a failed lifter oil manifold solenoid for cylinder 1.

🚗 Yes usually, but repair promptly to avoid lifter damage.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Open in control circuit$100-$300

40%

Break in the wiring to the cylinder 1 solenoid.

#2Failed cylinder 1 AFM solenoid$300-$700

35%

Open winding in the lifter oil manifold solenoid.

#3Loose or corroded connector$50-$150

15%

High resistance at the connector reads as circuit high.

#4PCM driver fault$300-$900

10%

Rarely, the PCM control driver fails.

🩺 Common Symptoms

Check engine light
Misfire on cylinder 1
Lifter tick
Rough idle
Reduced power

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$700

Shop Cost

$150-$1200

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P3404

1Check the cylinder 1 solenoid circuit for opens

2Measure solenoid resistance

3Inspect and clean the connector

4Repair wiring or replace the solenoid

❓ Frequently Asked Questions

What does circuit high mean on P3404?

The control voltage is higher than expected, usually an open circuit or an open solenoid winding.

How do I fix P3404?

Check the wiring and connector to the cylinder 1 solenoid for opens, then test and replace the solenoid if faulty.

Is P3404 serious?

It is a moderate concern. The cylinder can misfire or stay deactivated, so repair it before it causes further damage.

🔗 Related Codes

P3401P3402P3403P0301