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PostPosted: Sun Feb 12, 2017 11:37 pm 
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Joined: Tue Jul 12, 2016 2:12 am
Posts: 134
Location: South Bend, IN
About a month ago my check engine light came on, checked it with the torque app and it said oil pressure sender range fault.
little research said this is pretty common on g8s, so i changed it (huge pita if the connector faces the intake...) and the light was gone.

problem solved until this last tuesday, when i was driving home from work and the CEL came back on.
checked with torque, same story P0521 "Engine Oil Pressure Sensor/Switch Range/Performance".
figured i'd gotten a bad one and replaced it today, problem persisting...


any ideas? there would be a real warning for low oil pressure right, it still drives the same.


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PostPosted: Mon Feb 13, 2017 4:22 am 
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Joined: Mon Jul 29, 2013 6:44 am
Posts: 1099
Location: Azusa,CA
Here is the Diagnosis document from the service manual:

http://docdro.id/eSMNdw7

And this is a TSB for -0 cold starts, do not think that is your case.

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Azusa, CA
'11 PPV 9C3 Huron White


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PostPosted: Mon Feb 13, 2017 4:38 am 
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Joined: Tue Jul 12, 2016 2:12 am
Posts: 134
Location: South Bend, IN
yeah it's not at a cold start, havent been able to nail down specifics.

theres a very concerning line in that document: "oil pressure is below 1.16 psi above 1520 rpm"
so it could be low pressure?

but i can clear it with my obd reader and it doesnt come back immediately, with it should if the pump was bad?

also, theres a filter under the sensor right? i didn't replace it, so is it possible that it is gunked up and could be affecting the reading?


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PostPosted: Tue Feb 21, 2017 8:22 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1345
Location: Pearland, Texas
Not necessarily replace it, but you should at least pull it and make sure it's clean. I have heard it can be an issue, though.

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PostPosted: Thu Feb 23, 2017 3:01 am 
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Joined: Sat Sep 26, 2015 3:53 am
Posts: 112
I had the sensor fail on me as well. Replaced with with ACDelco and the problem has not come back for about a week or so. Are you using AC Delco or aftermarket?

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PostPosted: Mon Feb 27, 2017 2:01 am 
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Joined: Tue Jul 12, 2016 2:12 am
Posts: 134
Location: South Bend, IN
I'm using aftermarket, different brand for both sensors, still got the cel
I figured aftermarket shouldn't be a big issue, considering this part is in like all gm v8s right?


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PostPosted: Wed May 03, 2017 11:53 pm 
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Joined: Tue Jul 12, 2016 2:12 am
Posts: 134
Location: South Bend, IN
so i finally resolved this with an OEM sensor and an oil change, still at 40% life on the monitor. pretty dark though, ill have to shorten the interval


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PostPosted: Thu May 04, 2017 1:31 am 
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Joined: Mon Jul 29, 2013 6:44 am
Posts: 1099
Location: Azusa,CA
Well I would imagine if the oil life monitor was not getting the correct pressure fugures it may have screwed up it's calculation. Maybe.

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Azusa, CA
'11 PPV 9C3 Huron White


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