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