What Does P3431 Mean?
The PCM has detected abnormally low voltage or resistance in the cylinder 4 exhaust valve control circuit. This indicates a short to ground condition in the circuit or solenoid.
Common Causes
40%
Short to ground in wiring harness for exhaust valve control circuit
30%
Failed cylinder 4 exhaust valve solenoid with internal short circuit
20%
Damaged or water-intrusion in connector causing short
10%
PCM internal driver circuit shorted
Diagnostic Steps
1
Step 1: Disconnect cylinder 4 exhaust valve solenoid and test harness for short to ground
2
Step 2: Measure solenoid coil resistance and check for abnormally low readings
3
Step 3: Inspect connector and terminals for moisture, corrosion, or pin damage
4
Step 4: Trace wiring harness for chafing or damage, especially near heat sources
5
Step 5: Test PCM driver output by monitoring voltage with solenoid disconnected
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 exhaust valve control circuit. This indicates a short to ground condition in the circuit or solenoid.
The most common cause of P3431 (Cylinder 4 Exhaust Valve Control Circuit Low) is: Short to ground in wiring harness for exhaust valve control circuit
Typical repair costs for P3431 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but exhaust valve control will be disabled. May experience reduced performance and increased fuel consumption.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3431 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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