Cylinder 2 Deactivation/Intake Valve Control Circuit Low
Diagnostic trouble code P3411 indicates that the powertrain control module (PCM) has detected a low voltage condition in the control circuit for the cylinder 2 deactivation or intake valve mechanism. This typically means the circuit is shorted to ground or has excessive resistance, preventing the cylinder deactivation system from operating correctly on cylinder 2.
While the vehicle can usually still be driven, the cylinder deactivation system will be disabled, leading to reduced fuel economy and potential drivability issues. It should be diagnosed and repaired soon to prevent further engine management complications.
Common symptoms
- Illuminated Check Engine Light
- Decreased fuel efficiency
- Engine misfires or runs rough
- Lack of engine power
- Cylinder deactivation system disabled
Likely causes
- Faulty cylinder 2 deactivation solenoid/actuator
- Wiring harness damage (short to ground or open circuit) in the cylinder 2 deactivation circuit
- Poor electrical connection at the cylinder 2 deactivation solenoid
- Low engine oil pressure or incorrect oil viscosity
- Restricted oil passages leading to the deactivation solenoid
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Check engine oil level and condition.
Look for: Ensure the oil is at the correct level and is the proper viscosity, as cylinder deactivation systems rely heavily on correct oil pressure to function.
Visually inspect the wiring and connectors for the cylinder 2 deactivation solenoid.
Look for: Look for frayed wires, melted insulation, corrosion, or loose pins that could cause a short to ground or high resistance in the circuit.
Test the resistance of the cylinder 2 deactivation solenoid using a multimeter.
Look for: Compare the measured resistance to the manufacturer's specifications. An out-of-spec reading indicates a faulty solenoid.
Check for voltage and ground at the cylinder 2 deactivation solenoid connector.
Look for: With the key on and engine off (or commanded via a scan tool), verify that the PCM is supplying the correct control voltage and ground. A lack of voltage suggests a wiring issue or PCM fault.
Perform an oil pressure test using a mechanical gauge.
Look for: Verify that the engine oil pressure meets the manufacturer's specifications, as low oil pressure can prevent the deactivation solenoids from operating properly even if the electrical circuit is intact.
This page explains the generic P3411 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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