What Does P3426 Mean?
The PCM has detected a performance issue with the cylinder 4 intake valve control system used for cylinder deactivation. The valve timing or lift is not responding as expected during deactivation/activation cycles.
Common Causes
35%
Faulty cylinder 4 intake valve control solenoid or lifter
25%
Low engine oil level or incorrect oil viscosity affecting hydraulic operation
20%
Wiring issues or connector problems in valve control circuit
15%
Mechanical wear in valve train components
5%
PCM software issue or internal PCM fault
Diagnostic Steps
1
Step 1: Check engine oil level and condition; verify correct viscosity specification for cylinder deactivation system
2
Step 2: Inspect wiring harness and connector at cylinder 4 intake valve control solenoid for damage or corrosion
3
Step 3: Monitor solenoid operation with scan tool during cylinder deactivation cycles while engine is running
4
Step 4: Test valve control solenoid resistance and compare to specifications
5
Step 5: Perform mechanical inspection of cylinder 4 valve train components if electrical tests pass
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The PCM has detected a performance issue with the cylinder 4 intake valve control system used for cylinder deactivation. The valve timing or lift is not responding as expected during deactivation/activation cycles.
The most common cause of P3426 (Cylinder 4 Deactivation/Intake Valve Control Circuit Performance) is: Faulty cylinder 4 intake valve control solenoid or lifter
Typical repair costs for P3426 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced fuel economy and rough idle. Continued operation may cause catalytic converter damage from misfires.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3426 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Variable Valve Timing / 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.
