When Error Code P0521 is triggered, that means the PCM has determined an unexpected value in engine oil pressure sender/sensor, which is out of its normal range or could be fixed when it should fluctuate. Sometimes, however, there is no gauge rather, there will be a warning light to notify the driver about the problem. For some vehicles, oil pressure value is relayed to a gauge in the instrument cluster, showing the driver the oil pressure. It relays information through voltage reading value to the PCM. One of these sensors is the ‘Oil Pressure Sensor’ or ‘Oil Pressure Sender’ which detects the amount of (mechanical) oil pressure in the engine. The PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) is the vehicle’s computer system which controls multiple controls, electronics, and sensors. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another. It is particularly common among Cadillac, Chevrolet, Dodge, GMC, Mercedes Benz, and Pontiac models. This is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system, particularly those made since 1996 up to present. Error Code P0521 is defined as Engine Oil Pressure Sensor/Switch Range/Performance.
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