The P0523 code means that the engine oil pressure sensor/switch A circuit is high.
The Engine Oil Pressure Sensor communicates the engine oil pressure to the engine control module (PCM). If the PCM identifies an inaccurate signal from this sensor, it will trigger code P0523. Additionally, the low oil warning light on the instrument cluster may illuminate.
The most likely cause of this code is a faulty oil pressure sensor or switch. The next most common culprit is defective wiring between the sensor and ECU, but an issue with either part can also cause it. Below are some common causes:
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