What Does P3423 Mean?
The PCM detected a lower than expected voltage in the cylinder 3 exhaust valve control circuit. This indicates a short to ground or internal solenoid failure in the exhaust valve deactivation system.
Common Causes
35%
Shorted wiring harness to cylinder 3 exhaust valve control solenoid
30%
Failed cylinder 3 exhaust valve control solenoid (internal short to ground)
20%
Corroded or oil-contaminated electrical connector
10%
PCM internal driver circuit failure
5%
Damaged solenoid mounting causing case ground
Diagnostic Steps
1
Step 1: Inspect cylinder 3 exhaust valve control solenoid connector for oil intrusion and corrosion
2
Step 2: Disconnect solenoid and measure resistance (typically 5-12 ohms); check against specifications
3
Step 3: Check control circuit for short to ground using multimeter between PCM connector and ground
4
Step 4: Inspect solenoid mounting for proper insulation from ground
5
Step 5: Test PCM driver circuit by measuring voltage supply with solenoid disconnected
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The PCM detected a lower than expected voltage in the cylinder 3 exhaust valve control circuit. This indicates a short to ground or internal solenoid failure in the exhaust valve deactivation system.
The most common cause of P3423 (Cylinder 3 Exhaust Valve Control Circuit Low) is: Shorted wiring harness to cylinder 3 exhaust valve control solenoid
Typical repair costs for P3423 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but fuel economy and performance will be reduced. Cylinder deactivation will not operate correctly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3423 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.
