Cylinder 2 Deactivation/Intake Valve Control Circuit High
Code P3412 indicates that the powertrain control module (PCM) has detected a high voltage condition in the cylinder 2 deactivation/intake valve control circuit. This circuit is responsible for controlling the intake valve timing or cylinder deactivation mechanism, typically found in engines with variable valve timing (VVT) or cylinder deactivation systems. A high voltage reading suggests a short to power, a faulty actuator, or a wiring issue, which can prevent proper valve operation and lead to reduced engine performance.
01. Most Common Causes
- Short to voltage in the control circuit wiring
- Faulty cylinder deactivation solenoid or actuator
- Damaged PCM or internal short
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or misfire on cylinder 2
- Poor fuel economy and rough idle
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve freeze frame data and confirm code P3412.
Step 2: Visually inspect the wiring and connector for cylinder 2 deactivation solenoid for damage, corrosion, or shorts.
Step 3: Measure voltage at the solenoid connector with key on; compare to manufacturer specs (typically 12V).
Step 4: Test the solenoid resistance with a multimeter; replace if out of range.
Step 5: If wiring and solenoid are okay, check PCM for internal faults or perform a pin drag test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine misfire, reduced power, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary: wiring repair $100-$300, solenoid replacement $150-$400, PCM replacement $500-$1000.