P0520 Chevrolet Silverado 1500
Engine Oil Pressure Sensor/Switch Circuit Malfunction · Powertrain Code · High · Repair: Easy
What is P0520?
The oil pressure sensor or switch circuit has a fault.
When the Chevrolet Silverado 1500 triggers code P0520 (engine oil pressure sensor/switch circuit malfunction), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Chevrolet Silverado 1500.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Chevrolet Silverado 1500.
Common Causes on Chevrolet Silverado 1500
- Failed oil pressure sensor/switch
- Low engine oil level
- Worn oil pump or pickup screen clogged (high-mileage V8s)
- Oil pressure sensor wiring fault or connector corrosion
Symptoms
- Check Engine Light on
- Oil pressure gauge reads zero or erratically
- Low oil pressure warning on DIC (Driver Information Center)
- Possible engine ticking if oil pressure is actually low
Notes for Chevrolet Silverado 1500
Always verify actual oil pressure with a mechanical gauge before dismissing this as a sensor issue — low oil pressure on GM V8s can indicate serious engine wear.