Cylinder 4 Deactivation/Intake Valve Control Circuit High
Code P3428 indicates a high voltage condition in the cylinder 4 deactivation/intake valve control circuit. This circuit is part of the cylinder deactivation system (e.g., Active Fuel Management or Variable Cylinder Management) that deactivates intake valves to shut down cylinders under light load. A high voltage reading suggests a short to power, a faulty actuator, or a wiring issue. This can prevent proper valve operation, leading to misfires, reduced fuel economy, and potential engine damage.
1. Most Common Causes
- Short to voltage in the wiring or connector of the cylinder 4 deactivation solenoid
- Faulty cylinder 4 deactivation/intake valve control solenoid
- Engine control module (ECM) internal failure
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy
- Possible hesitation or lack of power
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve freeze frame data and confirm code P3428.
Step 2: Visually inspect the wiring and connector for cylinder 4 deactivation solenoid for damage, corrosion, or shorts.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specs (typically 10-30 ohms).
Step 4: Check for voltage at the solenoid connector with key on; if voltage is present when it shouldn't be, repair short to power.
Step 5: If wiring and solenoid are good, suspect ECM failure; perform a continuity test between ECM and solenoid.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the cylinder deactivation system may not function properly, causing misfires and potential catalytic converter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether it's a wiring fix or solenoid replacement. ECM replacement would be more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.