What Does P3424 Mean?
The PCM detected a higher than expected voltage in the cylinder 3 exhaust valve control circuit. This indicates an open circuit, short to voltage, or failed solenoid in the exhaust valve control system.
Common Causes
30%
Open circuit in wiring harness to cylinder 3 exhaust valve control solenoid
30%
Failed cylinder 3 exhaust valve control solenoid (internal open circuit)
20%
Short to voltage in solenoid control circuit wiring
15%
Disconnected or damaged electrical connector at solenoid
5%
PCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Verify cylinder 3 exhaust valve control solenoid connector is properly seated and locked
2
Step 2: Disconnect solenoid and measure resistance; infinite resistance indicates failed solenoid
3
Step 3: Check for unwanted voltage at solenoid connector with key on, engine off
4
Step 4: Test continuity of control circuit from PCM to solenoid for open conditions
5
Step 5: Check for short to battery voltage using test light on control wire
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The PCM detected a higher than expected voltage in the cylinder 3 exhaust valve control circuit. This indicates an open circuit, short to voltage, or failed solenoid in the exhaust valve control system.
The most common cause of P3424 (Cylinder 3 Exhaust Valve Control Circuit High) is: Open circuit in wiring harness to cylinder 3 exhaust valve control solenoid
Typical repair costs for P3424 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but fuel economy will suffer. Engine may exhibit rough running during deactivation mode transitions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3424 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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