p0521
Moderate
Chevrolet · Trucks
Engine Oil Pressure Sensor/Switch Range/Performance
Quick Answer
Error code P0521 on your Chevrolet Trucks means: Engine Oil Pressure Sensor/Switch Range/Performance. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CK15706Colorado LT 2024Colorado Trail Boss 2024Colorado WT 2024Colorado Z71 2024Colorado ZR2 2024Silverado 1500 Custom 2024Silverado 1500 High Country 2024Silverado 1500 LT 2024Silverado 1500 LT Trail Boss 2024Silverado 1500 LTZ 2024Silverado 1500 RST 2024Silverado 1500 WT 2024Silverado 1500 ZR2 2024Silverado 2500HD High Country 2024Silverado 2500HD LT 2024Silverado 2500HD LTZ 2024Silverado 2500HD WT 2024CL14543CS10403CK10743CK10543CK20943CK30943CK10906
Likely Causes
How to Fix It
1
Check engine oil level and condition; top off or change if needed
2
Verify oil pressure with a mechanical oil pressure gauge
3
Inspect the oil pressure sensor electrical connector for corrosion
4
Replace the oil pressure sensor/sending unit if mechanical pressure is within spec
5
If mechanical pressure is low, investigate oil pump and engine bearings
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Oil pressure sensor/sending unit
Engine oil and filter
Electrical connector pigtail
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