OBD-II code P3424 indicates the engine control module (PCM/ECM) has detected a high-voltage condition in the exhaust valve control circuit for cylinder 3. On most engines this refers to the exhaust-side variable valve timing (VVT) solenoid or cam phaser actuator circuit, and a 'High' reading typically points to an open circuit, a short to voltage, or a solenoid/actuator that has failed in a way the PCM interprets as abnormally high signal voltage.
The exhaust valve control solenoid is the component most often at fault. Internal opens, shorts, or wear can cause the PCM to read a high circuit voltage.
An open wire, chafed insulation, loose pin, or corroded connector between the solenoid and the PCM is a very common cause of a high-voltage reading.
VVT and cam phaser systems depend on clean oil at proper pressure. Sludge, low level, or wrong viscosity can prevent the actuator from operating, indirectly triggering circuit fault codes.
A mechanically failed cam phaser may not move the camshaft as commanded, and the resulting position/voltage feedback can set this code.
The PCM itself is an uncommon cause, but an internal driver issue or software problem can occasionally produce this code. It should only be considered after the solenoid, wiring, oil, and phaser have been ruled out.
No. In the vast majority of cases P3424 is caused by the cylinder 3 exhaust VVT solenoid, its wiring, or oil-related issues — not the engine computer. The PCM should only be considered after those other causes have been tested and eliminated.
Short trips are usually possible, but the engine may run rough, have reduced power, use more fuel, and produce higher emissions. Prolonged driving with impaired VVT operation can stress other valvetrain components, so diagnosis should not be delayed.
It means the PCM measured a voltage in the exhaust valve control circuit that was above the expected range. This is most often the result of an open circuit or a short to power, or a solenoid that has failed in a way that pulls the signal high.
The code is cylinder-specific, so it points to the exhaust valve control components associated with cylinder 3 (solenoid, wiring, or phaser on that cylinder). Other cylinders have their own dedicated codes if they develop similar faults.