Error Code P0521-GMC Sierra/Silverado Circa 2010 Models

Just bought a brand new pre-owned vehicle from the dealership and my check engine light came on and I couldn't believe it. I took it down to the local auto parts store and got a digital readout for the error code. This came up as P0521 which was oil pressure related. I figured I'd start with the basics or start with the cheapest fix first. So I checked my oil. Sure enough it was low. I went and purchased the correct oil and filled it to the correct level. Sure enough, after starting again, the check engine light had disappeared.

If you are not used to trucks or cars with bigger motors, often times you will find yourself adding more oil to them than you would have in the past with vehicles containing smaller sized engines. Below is a diagnostic code reader if you want to save yourself a trip to the parts store to have the code read out.



One of the things to be aware of is not to overfill our oil. This can cause engine problems as well. If you are just topping off you oil make sure to just add a little at a time to avoid overfilling. Take your time and check the dipstick often. It takes a minute or so for the oil to settle and accurately read on the dipstick. Also, check your owner's manual to see what kind of oil your vehicle should take. Another helpful tip or the a reason that your vehicle may be running low on oil is that it could have a leak somewhere. Does your driveway or place you park have fresh drops of oil on the ground?


If you detect oil drops coming from your vehicle you may just start with the simple stuff first before tearing into it too far. When the vehicle is cool, make sure the oil filter is hand tight and also make sure your oil pan plug is in tight. If you've taken your vehicle in to get an oil change they may have left something loose.