OBD Code P0521 on 2008 Chevy Silverado 1500

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Seven
Posts: 1
Joined: Wed Jun 14, 2017 12:14 pm
Vehicle: 2008 Chevrolet Silverado 1500

OBD Code P0521 on 2008 Chevy Silverado 1500

Postby Seven » Wed Jun 14, 2017 12:24 pm

I am having the dreaded low oil pressure code P0521. The oil pressure on the gauge starts off normal until the engine warms up then drops to around 20 PSI when at normal driving speed. But at an idle it drops to around 8 -10 PSI and causes the check engine light to illuminate. I have removed the filter under the oil pressure sending unit, replaced the sending unit twice, changed oil and filter multiple times. The oil pump has also been replaced. I do not have access to a mechanical oil pressure gauge but there is no engine noise when the pressure is around 10 PSI on the gauge. My question is how do I go about troubleshooting the wiring harness or the electrical side of this issue. Thanks.


kev2
Posts: 6578
Joined: Sat Aug 29, 2009 4:24 pm

Re: OBD Code P0521 on 2008 Chevy Silverado 1500

Postby kev2 » Thu Jun 15, 2017 6:38 am

You have replaced sensor, the circuit is 3 wires - one is reference voltage (supply) another return (signal) and a ground - probe connector, what is reference? confirm grnd , and output/return/signal?

You need to do a mechanical reading - gauges are sometimes available as loaner tools at part stores.

Using correct oil and filter?
You said oil pump was changed?
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kev2
Posts: 6578
Joined: Sat Aug 29, 2009 4:24 pm

Re: OBD Code P0521 on 2008 Chevy Silverado 1500

Postby kev2 » Thu Jun 15, 2017 7:02 am

quick questions -
Which engine 8th character of vin#...
no other codes?
engine is STOCK - thermostat, air filter assy, proms chips, etc?
do you have AFM?


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