What Causes the Oil Pump Light to Illuminate?

1 Answers
Jasper
07/30/25 5:19am
The oil pump light may illuminate due to the following reasons: Pressure relief valve blockage or improper adjustment: To prevent excessive lubricating oil pressure that increases engine power consumption and causes oil leaks at sealed connections, a pressure relief valve is installed in the main oil passage or oil pump. A malfunctioning pressure relief valve can lead to abnormal oil pressure, causing the oil light to illuminate; Insufficient oil quantity: If the oil quantity is insufficient, the oil pump's output decreases or fails to pump oil due to air ingress, resulting in reduced oil pressure and illumination of the oil light; Engine overheating: An overheated engine accelerates oil aging, deterioration, and thinning, leading to leakage through various clearances, pressure drop, and illumination of the oil warning light; Oil filter clogging: When the oil filter is clogged and cannot circulate oil, the bypass valve on its base opens, allowing oil to bypass the filter and enter the main oil passage directly. If the bypass valve's opening pressure is set too high or too low, the oil pump pressure will rise or fall, which can also cause the light to illuminate.
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