Cylinder 2 Exhaust Valve Control Circuit High
Diagnostic trouble code P3416 indicates that the powertrain control module (PCM) has detected a high electrical voltage condition in the control circuit for the cylinder 2 exhaust valve deactivation mechanism. This typically occurs in engines equipped with cylinder deactivation systems when the circuit voltage exceeds the manufacturer's specified maximum threshold.
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 restore full system functionality and prevent further engine management complications.
Common symptoms
- Illuminated Check Engine Light
- Decreased fuel efficiency
- Engine misfires or rough running
- Hesitation during acceleration
- Cylinder deactivation system disabled
Likely causes
- Faulty cylinder 2 exhaust valve control solenoid
- Corroded, damaged, or loose electrical connections in the solenoid circuit
- Short to voltage in the wiring harness for the cylinder 2 exhaust valve control circuit
- Low engine oil level or poor oil pressure affecting the deactivation lifters
- Mechanical failure within the cylinder 2 deactivation lifter
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Check the engine oil level and condition.
Look for: Ensure the oil is at the correct level and is clean, as cylinder deactivation systems rely heavily on proper oil pressure and clean oil to function correctly.
Visually inspect the wiring and connectors for the cylinder 2 exhaust valve control solenoid.
Look for: Look for frayed wires, melted insulation, or corroded pins that could cause a short to voltage or high resistance in the circuit.
Test the cylinder 2 exhaust valve control solenoid resistance using a multimeter.
Look for: Compare the measured resistance to the manufacturer's specifications; an out-of-spec reading indicates a failed solenoid.
Check for voltage and ground at the solenoid connector with the key on, engine off.
Look for: Verify that the circuit has the correct reference voltage and a good ground. A constant high voltage on the control side indicates a short to power.
Perform an active test of the cylinder 2 exhaust valve solenoid using a bidirectional scan tool.
Look for: Listen for a click from the solenoid and monitor the circuit voltage on the scan tool to see if the PCM can successfully command the solenoid on and off.
This page explains the generic P3416 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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