What Does P3402 Mean?
The cylinder 1 deactivation intake valve control circuit is functioning outside expected performance parameters. The system is operating but not responding correctly to ECM commands.
Common Causes
35%
Stuck or sluggish valve lifter in cylinder 1
30%
Low oil pressure or restricted oil passages
20%
Weak or partially failed deactivation solenoid
15%
Excessive resistance in solenoid circuit wiring
Diagnostic Steps
1
Step 1: Verify engine oil pressure meets manufacturer specifications using mechanical gauge
2
Step 2: Monitor cylinder 1 deactivation response time using scan tool live data during activation cycles
3
Step 3: Measure voltage drop in solenoid circuit under load conditions
4
Step 4: Perform oil pressure test specifically at deactivation oil manifold if accessible
5
Step 5: Consider using engine oil flush if contamination is suspected before replacing components
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The cylinder 1 deactivation intake valve control circuit is functioning outside expected performance parameters. The system is operating but not responding correctly to ECM commands.
The most common cause of P3402 (Cylinder 1 Deactivation/Intake Valve Control Circuit Performance) is: Stuck or sluggish valve lifter in cylinder 1
Typical repair costs for P3402 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to operate. May notice slight vibration or reduced fuel efficiency when system attempts to deactivate cylinder 1.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3402 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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