p0521
Moderate
Buick · SUVs
Engine Oil Pressure Range/Performance
Quick Answer
Error code P0521 on your Buick SUVs means: Engine Oil Pressure Range/Performance. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Check oil level and top off if needed
2
Replace oil filter
3
Test oil pressure sensor output voltage
4
Check mechanical oil pressure with gauge
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
Engine oil
Oil filter
Oil pressure gauge
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