Cylinder 6 Deactivation/Intake Valve Control Circuit Low
The P3443 code indicates a low voltage condition in the cylinder 6 deactivation/intake valve control circuit. This circuit is part of the cylinder deactivation system (e.g., Active Fuel Management or Variable Cylinder Management) that shuts down cylinders to improve fuel economy. A low voltage reading suggests a short to ground, open circuit, or faulty component in the solenoid or wiring. This can prevent the valve from operating correctly, causing the cylinder to remain active or inactive improperly, leading to performance issues.
1. Most Common Causes
- Faulty cylinder 6 deactivation/intake valve solenoid
- Short to ground in the wiring or connector
- Open circuit in the control circuit
- Engine control module (ECM) failure
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Engine misfire or rough idle
- Loss of power or hesitation
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the wiring and connector for cylinder 6 deactivation solenoid for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specs (typically 20-30 ohms).
Step 4: Check for voltage at the solenoid connector with the engine running; should see battery voltage when commanded on.
Step 5: If wiring and solenoid are good, test the ECM output or replace the ECM.
4. 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 performance, and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary: solenoid replacement $150-$300, wiring repair $100-$200, ECM replacement $500-$1000. Diagnostic fees are typically $100-$150.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.