P0521 on GMC vehicles The oil pressure sensor reading does not track what the engine is doing
P0521 is named on 5 GMC model years (2016–2020): 8 manufacturer filings and 0 owner reports in NHTSA’s files, across Savana, Acadia, Sierra 3500HD.
Which GMC model years name P0521
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2016 GMC Savana | Engine | 3 | — |
| 2019 GMC Savana | Engine | 2 | — |
| 2020 GMC Savana | Engine | 1 | — |
| 2016 GMC Acadia | Engine | 1 | — |
| 2016 GMC Sierra 3500HD | Engine | 1 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
GMC filings that name P0521
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names P0521. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIP4786C Service bulletin2016-08-15 · Engine And Engine Cooling
- THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT MAY HAVE LOW OIL PRESSURE MESSAGE. TECHNICIAN MAY ALSO FIND A DIAGNOSTIC TROUBLE CODE P0521 IN THE ENGINE CONTROL MODULE. TECHNICIAN SHOULD FOLLOW ALL PUBLISHED SERVICE INFORMATION DIAGNOSIS. WHEN USING A SCAN TOOL IF THE OIL PRESSURE IS LOW BUT THE OIL PRESSURE AT THE OIL FILTER HOUSING IS CORREC
- PIP5630B Service bulletin2019-08-13 · Engine
- This Preliminary information communicates A vehicle may have a concern of no oil pressure and/or P0521 set. the releif valve in the pump is sticking or the number 1 main bearing is damaged. Drop oil pan and confirm #1 main is spun or not. If bearings are OK Then change oil pump.
- PIP5630D Service bulletin2020-06-17 · Engine And Engine Cooling
- This Preliminary information communicates A vehicle may have a concern of no oil pressure and/or P0521 set. the releif valve in the pump is sticking or the number 1 main bearing is damaged. Drop oil pan and confirm #1 main is spun or not. If bearings are OK Then change oil pump.
What P0521 means
Source: SAE J2012 / OBD-IIThe oil pressure sensor reading does not track what the engine is doing.
A stored code names the test that failed, never the part that caused it. The record above is what GMC and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0521 a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 8 manufacturer filings and 0 owner reports naming P0521 on 5 GMC model years (2016–2020). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which GMC models does P0521 appear on most?
2016 Savana (3 documents), 2019 Savana (2 documents), 2016 Acadia (1 document).
Does P0521 on a GMC mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.