Symptoms of a low oil pressure condition have become a common complaint on GM vehicles equipped with active fuel management, sometimes referred to as displacement on demand. The symptoms may be the result of one of two malfunctioning pressure regulating valves or from a restriction in a filter, screen positioned beneath the oil pressure sensor. The small screen prevents contaminants from collecting in the valve lifter oil manifold and its related solenoids. A contaminated screen results in reduced oil flow to the oil pressure sensor, resulting in a low oil pressure symptom. Read on to determine the cause of the low oil pressure symptom.