![]() That being said, the most common cause for this trouble code is a lack of sufficient engine maintenance on the part of the owner. An open or shorted wiring in the oil pressure sending unit circuit.Some common causes behind the P0521 code are: The unexpected value could simply be more or less than the acceptable range or the pressure could simply be fixed in place when it should be fluctuating. If the PCM ever detects an unexpected value, the P0521 code is stored. In other models, there is no gauge, but a warning light will be activated if there is a problem where oil pressure is concerned. In some vehicles, there is a gauge in the dashboard that will show how much oil pressure there is. The PCM will then notify the driver of this information one of two ways. It then sends this reading to the PCM in the form of a voltage value. ![]() One such sensor is the oil pressure sensor which detects how much mechanical oil pressure is present in the engine. This computer controls a number of sensors, controls and other electronic components. What the P0521 code meansĮvery modern vehicle is outfitted with a PCM (Powertrain Control Module). The P0521 code is defined as there being a fault with the engine oil pressure sensor/switch range/performance. P0521 OBD-II Trouble Code: Engine Oil Pressure Sensor/Switch Range/Performance Diagnostic Trouble Code (DTC): P0521 P0521 code definition ![]()
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