Cylinder 6 Deactivation/Intake Valve Control Circuit High
The P3444 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the cylinder 6 deactivation/intake valve control circuit. This circuit controls the oil pressure solenoid that activates the valve lifters for cylinder deactivation (e.g., Active Fuel Management or Variable Cylinder Management). A high voltage reading suggests a short to power, a faulty solenoid, or a wiring issue. This can prevent the cylinder from deactivating properly, leading to reduced fuel economy, rough idle, or misfires.
1. Most Common Causes
- Faulty cylinder deactivation solenoid on cylinder 6
- Short to power in the wiring or connector
- Corroded or damaged connector pins
- PCM internal failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Rough idle or engine misfire
- Possible hesitation or lack of power
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 6 deactivation solenoid for damage, corrosion, or shorts.
Step 3: Use a multimeter to check for voltage at the solenoid connector with key on; should be battery voltage. If not, check for open or short.
Step 4: Test the solenoid resistance; compare to manufacturer specs (typically 10-30 ohms). Replace if out of range.
Step 5: Clear code and test drive; if code returns, suspect PCM issue.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause misfires, reduced fuel economy, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and solenoid replacement if DIY; shop labor may add $100-$200.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.