![]() The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the measured oil pressure is at least 47 kPa (6.8 psi) less than or 50 kPa (7.3 psi) higher than the predicted oil pressure or the engine oil pressure is outside of a calculated working range determined by engine speed and temperature. The instrument cluster will illuminate or display the engine oil pressure indicator when the engine oil pressure is low. The ECM sends the engine oil pressure information to the instrument cluster via serial data. When the engine oil pressure is low, the engine oil pressure sensor voltage is low, and the ECM senses a low signal voltage. When the engine oil pressure is high, the engine oil pressure sensor voltage is high, and the ECM senses a high signal voltage. The ECM monitors the signal circuit of the engine oil pressure sensor to determine if the engine oil pressure sensor voltage is within the normal operating range of approximately 1 - 4 V. The Engine Control Module (ECM) supplies 5 V to the engine oil pressure sensor via the 5 V reference circuit and provides ground via the low reference circuit. There is a factory service bulletin for the following. This can be an indication of mechanical engine issues causing lower than expected engine oil pressure. DTC P0521 can be set if engine oil pressure is outside the calculated engine oil pressure model stored in the engine control module. The engine oil pressure sensor is a 3-wire sensor comprising the signal circuit, the low reference circuit, and the 5 V reference circuit. P0521 2016 CHEVROLET SILVERADO code tech notes. The engine oil pressure sensor changes voltage based on the engine oil pressure.
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