P055B BUICK – Intake Camshaft Position Actuator Oil Pressure Sensor Performance

P055B BUICK Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P055B BUICK Possible Causes

Faulty Intake Camshaft Position Actuator Oil Pressure Sensor,Intake Camshaft Position Actuator Oil Pressure Sensor harness is open or shorted,Intake Camshaft Position Actuator Oil Pressure Sensor circuit poor electrical connection

P055B BUICK Description

The Intake Camshaft Position Actuator Oil Pressure Sensor, located in the cylinder head, is a 3-wire sensor comprising of a signal circuit, low reference circuit and the 5-volt reference circuit. The Engine Control Module (ECM) supplies 5 volts to the sensor via the 5-volt reference circuit and provides ground via the low reference circuit. The ECM monitors the signal circuit to determine the sensor voltage is within the normal operating range of approximately 1-4 volts. When the intake camshaft position actuator oil pressure is high, the sensor voltage is high and the ECM senses a high signal voltage. When the intake camshaft position actuator oil pressure is low, the sensor voltage is low and the ECM senses a low signal voltage. The intake camshaft position actuator oil pressure sensor is used by the ECM for variable valve lift performance diagnosis.