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
Likely Causes
  1. Low engine oil level
  2. Dirty or clogged oil filter
  3. Faulty oil pressure sensor
  4. Worn oil pump or bearings
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
Related Error Codes
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