P3428 indicates the engine control module has detected an abnormally high voltage signal in the control circuit for the intake valve on cylinder 4’s deactivation system. This usually means the circuit is open or shorted to power, preventing proper cylinder deactivation.
The intake valve solenoid on cylinder 4 is internally shorted or mechanically stuck, causing a high-voltage signal in its control circuit.
Chafed, broken, or corroded wires between the PCM and cylinder 4 deactivation solenoid, or a poor connection at the solenoid or PCM.
A wire in the solenoid control circuit is shorted to battery voltage, creating a high-voltage signal at the PCM.
The mechanical lifter for cylinder 4’s intake valve is seized or damaged, preventing proper operation and affecting the circuit signal.
Low oil level, incorrect oil viscosity, or degraded oil can prevent proper hydraulic operation of the deactivation system, indirectly affecting circuit signals.
An internal fault in the PCM’s driver circuit for the solenoid is possible but uncommon; verify all other causes first.
No. While the PCM controls the circuit, PCM failure is a very rare cause of P3428. The solenoid, wiring, or mechanical components are far more likely culprits.
You can drive short distances, but prolonged driving may reduce fuel economy and could lead to additional engine wear or emissions issues. Diagnose and repair promptly.
Not always. The solenoid is the most common cause, but wiring damage, oil issues, or mechanical lifter problems can also trigger this code. Thorough diagnosis is needed.
Only if the oil level was low or the oil was degraded/contaminated. If oil quality is poor, an oil change may help, but it won’t resolve wiring or mechanical faults.