What Does P3404 Mean?
The cylinder 1 deactivation intake valve control circuit voltage is above the expected range. The ECM detects higher than normal voltage in the control circuit.
Common Causes
35%
Open circuit in ground side of solenoid circuit
30%
Short to voltage in solenoid control circuit
25%
Failed deactivation solenoid with internal open circuit
10%
ECM internal control circuit failure
Diagnostic Steps
1
Step 1: Disconnect cylinder 1 deactivation solenoid and check for battery voltage at harness connector with key on
2
Step 2: Test for continuity between solenoid ground terminal and engine ground with key off
3
Step 3: Measure solenoid coil resistance when disconnected; compare to manufacturer specifications
4
Step 4: Inspect wiring for damage or contact with power sources that could cause voltage backfeed
5
Step 5: Test ECM control circuit by measuring voltage when solenoid disconnected and commanded on
Estimated Repair Cost
$120 - $900
Parts + labor, varies by vehicle and location
The cylinder 1 deactivation intake valve control circuit voltage is above the expected range. The ECM detects higher than normal voltage in the control circuit.
The most common cause of P3404 (Cylinder 1 Deactivation/Intake Valve Control Circuit High) is: Open circuit in ground side of solenoid circuit
Typical repair costs for P3404 range from $120 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. Cylinder 1 remains fully active, causing minor reduction in fuel efficiency but no driveability concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3404 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cylinder Deactivation System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
