p0521
Moderate
Chevrolet · SUVs
Engine Oil Pressure Sensor/Switch Range/Performance
Quick Answer
Error code P0521 on your Chevrolet SUVs 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
CL14636CL14606Blazer LT 2024Blazer Premier 2024Blazer RS 2024Equinox Activ 2024Equinox LT 2024Equinox RS 2024Suburban High Country 2024Suburban LS 2024Suburban LT 2024Suburban Premier 2024Suburban RST 2024Tahoe High Country 2024Tahoe LS 2024Tahoe LT 2024Tahoe Premier 2024Tahoe RST 2024Tahoe Z71 2024Trailblazer Activ 2024Trailblazer LS 2024Trailblazer LT 2024Trailblazer RS 2024Traverse LS 2024Traverse LT 2024Traverse Premier 2024Traverse RS 2024Traverse Z71 2024Trax Activ 2024Trax LS 2024Trax LT 2024Trax RS 2024CL14526CL14506CK10906CK10706CL14456CL14806CL14416
Likely Causes
How to Fix It
1
Check engine oil level and condition; add or change oil as necessary
2
Install a mechanical oil pressure gauge to verify actual oil pressure
3
Inspect the oil pressure sensor connector for corrosion or damage
4
Replace the oil pressure sensor if mechanical pressure reads within specification
5
If oil pressure is mechanically low, further diagnosis of the oil pump or bearings is required
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
Sensor connector pigtail
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