DTC P128A: Rocker Arm Oil Pressure Sensor B Stuck High: General Description

Two rocker arm oil control solenoids open and close according to commands from the powertrain control module (PCM), and oil pressure is applied to and then released from the valve pause system (VPS) to change operation of the valve. The PCM monitors the oil pressure of the switching mechanism using rocker arm oil pressure sensors on the rocker arm oil control solenoid. The PCM compares the oil pressure based on the PCM command and the oil pressure condition of the rocker arm oil pressure sensor to determine if the system is operating normally.