What Does P3409 Mean?
The PCM has detected an open circuit in the cylinder 2 intake valve control or cylinder deactivation system. This indicates a break in electrical continuity preventing proper control of cylinder 2's intake valve operation.
Common Causes
35%
Broken or disconnected wiring to cylinder 2 intake valve solenoid
30%
Failed intake valve control/deactivation solenoid (internal open)
20%
Corroded or damaged connector pins at solenoid
10%
Blown fuse for cylinder deactivation system
5%
Failed PCM output driver circuit
Diagnostic Steps
1
Step 1: Visually inspect wiring and connectors to cylinder 2 intake valve/deactivation solenoid for damage or disconnection
2
Step 2: Check continuity of wiring harness from solenoid to PCM using factory wiring diagram
3
Step 3: Measure resistance of intake valve control solenoid and compare to specifications
4
Step 4: Verify power supply and ground at solenoid connector with key on
5
Step 5: Test PCM control circuit by monitoring voltage drop when commanding solenoid activation with scan tool
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit in the cylinder 2 intake valve control or cylinder deactivation system. This indicates a break in electrical continuity preventing proper control of cylinder 2's intake valve operation.
The most common cause of P3409 (Cylinder 2 Deactivation/Intake Valve Control Circuit/Open) is: Broken or disconnected wiring to cylinder 2 intake valve solenoid
Typical repair costs for P3409 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but cylinder deactivation will not function properly, resulting in reduced fuel economy. May experience rough idle or slight performance loss.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3409 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing/Cylinder Deactivation System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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