Oil pump failure in your 2012 Jeep Grand Cherokee at 200,000 miles is a critical situation that can destroy the engine within minutes if not addressed. The oil pump provides the lifeblood of lubrication to all moving parts, and its failure is an emergency.
Warning Signs of Failing Oil Pump
Low oil pressure warning light or gauge reading. Engine noise - ticking, knocking, or clattering from insufficient lubrication. Oil pressure that drops at idle but rises with RPM. Overheating as oil also helps cool internal components. Any oil pressure warning demands immediate attention.
Code P0520 Significance
This code indicates an oil pressure sensor/switch circuit malfunction. While it could be just a sensor problem, you can't safely assume that without verification. The sensor may be correctly reporting an actual low-pressure situation.
Why Oil Pumps Fail
Wear to gears or rotors reduces pumping efficiency. Relief valve failure affects pressure regulation. Pickup screen clogging from sludge starves the pump. At 200,000 miles, simple wear-out is possible even with good maintenance.
Emergency Response
Stop driving immediately when oil pressure warning appears. Check oil level - low level can cause pressure warnings. Do not restart if you heard knocking before stopping. Have the vehicle towed - driving with no oil pressure destroys bearings within minutes.