Open or damaged wiring in the exhaust valve control circuit, such as a broken wire or corroded connector; Short to voltage on the control circuit, often from chafed insulation against a power wire; Failed cylinder 4 exhaust valve actuator or solenoid; Faulty powertrain control module (PCM) driver for that circuit, though rare; Poor electrical connection at the actuator or PCM connector, including loose pins or water intrusion; Aftermarket electrical accessories tapped into the circuit causing interference

DTC codes / P34xx · Auxiliary emission controls / P3432

P3432Cylinder 4 Exhaust Valve Control Circuit High

Q: What does code P3432 mean?

Cylinder 4 Exhaust Valve Control Circuit High. P3432 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the cylinder 4 exhaust valve actuator, which is part of a variable valve timing or cylinder deactivation system. The PCM expects the circuit to pull to a specific voltage when commanded, and a reading above the expected threshold signals an open circuit, short to power, or a failed actuator.

P3432 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the cylinder 4 exhaust valve actuator, which is part of a variable valve timing or cylinder deactivation system. The PCM expects the circuit to pull to a specific voltage when commanded, and a reading above the expected threshold signals an open circuit, short to power, or a failed actuator.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire sensation, particularly when the engine is cold or under light load
Reduced engine power or limp mode if the fault triggers protective strategies
Slightly higher fuel consumption due to improper valve timing
Intermittent hesitation during acceleration when the exhaust valve control is commanded

Common causes, most likely first

Open or damaged wiring in the exhaust valve control circuit, such as a broken wire or corroded connector
Short to voltage on the control circuit, often from chafed insulation against a power wire
Failed cylinder 4 exhaust valve actuator or solenoid
Faulty powertrain control module (PCM) driver for that circuit, though rare
Poor electrical connection at the actuator or PCM connector, including loose pins or water intrusion
Aftermarket electrical accessories tapped into the circuit causing interference

How to diagnose and fix it

Perform a visual inspection of the cylinder 4 exhaust valve actuator connector and wiring for damage, corrosion, or loose pins
Use a digital multimeter to check for battery voltage on the control circuit with the key on and engine off, comparing to the service manual specification
Disconnect the actuator and measure resistance across its terminals to verify it is within the manufacturer's specified range
Check for continuity between the actuator connector and the PCM connector to rule out an open circuit
Inspect for a short to voltage by measuring the control wire to ground with the PCM disconnected; any voltage indicates a short
If wiring and actuator test good, substitute a known-good actuator or perform a bidirectional scan tool test to command the valve and observe circuit response
Clear the code and verify repair with a test drive that includes the enabling conditions for the exhaust valve control system

What the high-voltage reading really means

A high voltage on the control circuit often indicates an open circuit rather than a short to power, because the PCM pull-up resistor raises the voltage when the actuator is disconnected.
The exhaust valve control system may be part of a variable valve timing or cylinder deactivation strategy, so a fault can cause drivability issues that seem unrelated to the exhaust valve itself.
Technicians sometimes replace the actuator unnecessarily when the real problem is a chafed wire harness near the exhaust manifold, where heat and vibration damage insulation.
A weak battery or poor ground can cause the PCM to misread circuit voltage, setting this code without any actual circuit fault.
This code can be set by a failed PCM driver, but that is rare; always rule out wiring and actuator faults before condemning the computer.

Can I keep driving with P3432?

You can usually drive the vehicle with this code, but avoid heavy acceleration and prolonged high-speed driving because the exhaust valve may not be controlled correctly, which can lead to overheating or catalytic converter damage over time. Have the fault diagnosed soon to prevent secondary damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.