Check for any applicable TSBs for your vehicle even if it's not one of those before going too far into diagnostics.Īs a vehicle owner / DIYer the first obvious thing to do is to check the oil level using the dipstick. The bulletins number are PIP4786C and PIP5276D. NOTE: For example, there are known service bulletins that applies to a number of certain 2005-2016 GM vehicles including Chevrolet, Cadillac, GMC, Pontiac, Buick, and Saab. Faulty wiring or connection/connector in the oil pressure sender circuitĪs we said earlier, this code should be addressed ASAP because if there is a mechanical problem like actual low oil pressure it can be a major and expensive repair.Old dirty oil (overdue for an oil change).Potential causes of a P0521 code include: Oil pressure indicator lamp illuminated.NOTE: This code is severe, if you have oil pressure issues with your engine, it could result in major damage, get your vehicle checked ASAP. For this P0521 trouble code, the cause may be mechanical or electrical, but is more than likely electrical related. It could be out of it's normal range or could be fixed when it should fluctuate. This specific P0521 engine code is triggered when the PCM sees an unexpected value in the engine oil pressure sender/sensor. In some vehicles, that oil pressure value is then relayed to a gauge in the instrument cluster to show the driver the oil pressure, other times that gauge is not there but there will be a warning light if there is a problem. One of the sensors called the oil pressure sensor or sender detects the amount of (mechanical) oil pressure in the engine and relays that in the form of a voltage reading/value to the PCM. The vehicle's main computer called the Powertrain Control Module (PCM) is in control of many sensors, controls, and electronics in the vehicle. In our experience the P0521 engine code appears more often on Chevrolet, Dodge, GMC, Mercedes Benz, Pontiac, and Cadillac, but applies to any make/model. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model. This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. P0521 Engine Oil Pressure Sensor/Switch Range/Performance OBD-II Trouble Code Technical DescriptionĮngine Oil Pressure Sensor/Switch Range/Performance
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