What Does P3401 Mean?
The intake valve control circuit for Cylinder 1's deactivation system has an open circuit condition. The ECM cannot control the deactivation solenoid due to electrical discontinuity.
Common Causes
40%
Open circuit in wiring harness to cylinder 1 deactivation solenoid
30%
Failed cylinder 1 deactivation solenoid
20%
Corroded or damaged connector at solenoid
10%
ECM internal driver circuit failure
Diagnostic Steps
1
Step 1: Inspect wiring harness and connector at cylinder 1 deactivation solenoid for damage or corrosion
2
Step 2: Test resistance of cylinder 1 deactivation solenoid; should typically be 10-30 ohms
3
Step 3: Check for continuity between ECM connector and solenoid connector with key off
4
Step 4: Test ECM output voltage to solenoid circuit with key on; should see battery voltage when commanded
5
Step 5: Compare readings to other cylinder deactivation circuits to identify pattern
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The intake valve control circuit for Cylinder 1's deactivation system has an open circuit condition. The ECM cannot control the deactivation solenoid due to electrical discontinuity.
The most common cause of P3401 (Cylinder 1 Deactivation/Intake Valve Control Circuit/Open) is: Open circuit in wiring harness to cylinder 1 deactivation solenoid
Typical repair costs for P3401 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with cylinder 1 remaining active at all times. Fuel economy will be slightly reduced.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3401 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
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