What Does P3428 Mean?
The PCM has detected abnormally high voltage in the cylinder 4 intake valve control circuit. This typically indicates an open circuit, short to power, or solenoid electrical failure.
Common Causes
35%
Open circuit in wiring harness to cylinder 4 intake valve solenoid
30%
Failed cylinder 4 intake valve control solenoid with open coil winding
20%
Disconnected or corroded connector at solenoid
10%
Short to voltage in control circuit wiring
5%
PCM internal driver circuit malfunction
Diagnostic Steps
1
Step 1: Inspect connector at cylinder 4 intake valve solenoid for proper seating and terminal integrity
2
Step 2: Measure solenoid coil resistance; infinite resistance indicates open circuit
3
Step 3: Check continuity of wiring from PCM connector to solenoid connector
4
Step 4: Test for short to voltage by measuring voltage at solenoid connector with key on, connector disconnected
5
Step 5: Monitor PCM command signal and verify proper switching voltage output
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected abnormally high voltage in the cylinder 4 intake valve control circuit. This typically indicates an open circuit, short to power, or solenoid electrical failure.
The most common cause of P3428 (Cylinder 4 Deactivation/Intake Valve Control Circuit High) is: Open circuit in wiring harness to cylinder 4 intake valve solenoid
Typical repair costs for P3428 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but cylinder deactivation will be disabled. Fuel economy will be reduced and engine may run slightly rougher than normal.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3428 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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