gealzonwheelz

I spoke with the service director just now, he called after seeing a negative review under their service satisfaction survey they sent me because of the P0521 code, they are still pointing fingers at replacing the sensor, which was done once and did not fix the issue, and he still did not want to believe that changing the oil and filter was allowing the CEL to be cleared so, I'm gonna run it for now, if the CEL returns, I will change the sensor one more time, if the CEL does not clear, I will change only the filter and continue to diagnose without the help of the dealer

I may consider doing some more oil changes more often and see what happens, I can ask for the records, I believe all I received before was the "carfax" Its a shame that dealerships can't even be trusted these days and really, really irritates me when they talk down to you about your vehicle, like you know absolutely nothing, which I suppose is 90% of the people who go to a dealer, I'm pretty mechanically inclined, I don't know much about newer cars or much about motors but I know enough, I have a jeep that I wrench on regularly as well as weld and build my own parts, just don't know much about diagnosing problems all the time how do you do an engine flush?

I used Mobil 1 full synthetic with dexos1 specs and an AC Delco filter, the dealer said they also were changing it with synthetic My original thought was to only change the filter first to see if that solved my issue but I thought if I let the dealership change the oil, and they took note of the light going out, then that would help me warranty the truck later, but they won't clear the light without the $98 diagnostic fee that I already paid 2 months ago and that told me nothing that I didn't already know I guess i'm going to let it go until either a 7,000 mile oil change or the CEL comes on again at 4,000 miles, then I will change only the filter myself and cut it open to see what the inside looks like Thankfully, the truck runs great, it does have the slightest miss at idle but I don't think I've ever had a vehicle that didn't, so I know I probably due to check the plugs soon too

Hello folks, This is my first post to the site and yes I have searched google many times for an answer to this but my problem seems to be somewhat unique also sorry for my punctuation, i tend to just type and rant sometimes My truck is a 2011 Silverado Crew Cab LT with the 5.3, 4x4, locking rear and tow package, the truck was a one owner, bought new at Serpentini Chevrolet in Tallmadge, Ohio, serviced at that dealer, traded in at that dealer and then sold to me used from that dealer, all sounded pretty good, right? I brought the truck home on December 4th, 2016 with somewhere around 55,500 miles and I have put almost 10,000 miles on it in 4 months so as you read below, you can see where 4,000 mile oil change intervals will quickly become a nuisance if I do not get this issue resolved somewhere around 59,000 miles, the truck threw engine code P0521, oil pressure sensor out of range, is what my scanner tells me, clear the code, it comes back on fairly quickly, I then replaced the oil pressure sensor and screen with AC delco parts, no change I then took the truck to the dealer that i bought it from, was charged $98 for the "diagnostic" test at which point I was told to replace the sensor and clean the screen, after telling them that I already did, they wanted to run more tests, at my expense or recommended an oil change At this point, I changed the oil myself, followed GM specs and used an AC delco filter, at this point I realized that the oil pressure before the oil change at 1500 RPM cruising down the highway was about 22 PSI, after the oil change at 1500 RPM, the pressure is now at 36-38 PSI, cleared the CEL and everything was happy 4,000 miles later, I start to notice the oil pressure looks a little low again, back around 22 PSI while cruising and the CEL comes back on, P0521, this time I take the truck back to the dealer to let them change the oil, CEL is still on, I tell them to make note of the PSI before and after the oil change because the truck was sold to me with a 2 year power train warranty and I'm hoping that all of this well help support my case in a warranty claim if there is problems later They change the oil, did note that the pressure went up after the change but blamed it on old, hot oil versus new, cold oil, fact of the matter is, once the truck is at operating temps and i have driven the truck 20+ miles, the PSI remains at the 36-38 PSI range while cruising, I got home and cleared the CEL because I was not going to pay the dealer $98 to do it again and the light has stayed off for the last 100 miles or so So basically, the dealership blew me off and said everything is normal, I would like to know why the CEL continues come on and appears to trigger around 4000 miles after each oil change, i am now plotting the oil pressure every 100 miles to see if it gradually decreases over time or if it drops fast around 4000 miles, my theory is something is clogging the oil filter, creating a loss in pressure and triggering the CEL, the oil looks good, no milkiness and no odd smells, i have not cut open any filters yet to see what they look like on the inside and I am worried that there is a bigger issue buried in the motor that is causing excessive build up in the filter Also my pressure gauge has never acted funny, never dropped to 0 and I have never gotten any engine warnings like you typically would get with a bad sensor So, does anyone have any thoughts or opinions on my problem? Thank you in advance