Cylinder 4 Exhaust Valve Control Circuit High
Diagnostic trouble code P3432 indicates that the powertrain control module (PCM) has detected a high electrical voltage condition in the control circuit for the cylinder 4 exhaust valve deactivation mechanism. This typically occurs in vehicles equipped with cylinder deactivation (variable displacement) systems when the circuit voltage exceeds the manufacturer's specified maximum threshold.
While not immediately dangerous, this code affects engine efficiency and performance. It should be diagnosed and repaired soon to prevent potential internal engine wear or drivability issues.
Common symptoms
- Illuminated Check Engine Light
- Decreased fuel economy
- Engine misfire or rough running
- Lack of engine power
- Vehicle fails to enter cylinder deactivation mode
Likely causes
- Faulty cylinder 4 exhaust valve control solenoid
- Corroded, damaged, or loose wiring in the cylinder 4 exhaust valve control circuit
- Poor electrical connection at the valve control solenoid
- Low engine oil level or poor oil pressure
- Restricted oil passages to the cylinder deactivation lifters
- 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.
Visually inspect the wiring harness and connectors for the cylinder 4 exhaust valve control solenoid.
Look for: Look for frayed wires, melted insulation, corrosion, or loose pins that could cause a high resistance or short to voltage.
Test the cylinder 4 exhaust valve control solenoid resistance using a digital multimeter.
Look for: Compare the measured resistance to the manufacturer's specifications; an open circuit or out-of-spec reading indicates a faulty solenoid.
Check the voltage supply and ground at the cylinder 4 exhaust valve control solenoid connector.
Look for: With the key on, engine off (or commanded via a scan tool), verify that the circuit is receiving the correct voltage and has a solid ground without excessive voltage drop.
Perform an active test of the cylinder 4 deactivation solenoid using a bi-directional scan tool.
Look for: Listen for an audible click from the solenoid and monitor the scan tool data to see if the PCM detects the commanded state; failure to actuate indicates a mechanical or electrical fault in the solenoid or circuit.
This page explains the generic P3432 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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