What Does P3427 Mean?
The PCM has detected abnormally low voltage or resistance in the cylinder 4 intake valve control circuit during deactivation operation. This indicates a short to ground or circuit resistance issue.
Common Causes
40%
Short to ground in wiring harness for cylinder 4 intake valve solenoid
30%
Failed cylinder 4 intake valve control solenoid with internal short
20%
Damaged or corroded connector causing short circuit
10%
PCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Disconnect cylinder 4 intake valve control solenoid and check for resistance to ground in harness
2
Step 2: Measure resistance of solenoid coil and compare to manufacturer specifications
3
Step 3: Inspect connector terminals for bent pins, corrosion, or moisture intrusion
4
Step 4: Check for chafed wiring along harness routing, especially near engine mount points
5
Step 5: Test PCM driver circuit by monitoring voltage output while commanding solenoid operation
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage or resistance in the cylinder 4 intake valve control circuit during deactivation operation. This indicates a short to ground or circuit resistance issue.
The most common cause of P3427 (Cylinder 4 Deactivation/Intake Valve Control Circuit Low) is: Short to ground in wiring harness for cylinder 4 intake valve solenoid
Typical repair costs for P3427 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains drivable but cylinder deactivation will not function properly. May experience reduced fuel economy and slight power loss.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3427 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
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