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Oil Pressure gauge P0521

Oil Pressure gauge P0521

Postby BigRedZ71 [OP] » Jan 13 2012, 12:30am

I have a 2008 5.3L with the flex fuel. I noticed the other day that my oil pressure gauge would run at about 40psi whit crusing but under braking it would fall to 20. Then once I got to a complete stop it would dip to around 10psi then return to 20. In my way to work this morning the CEL came on but the DIC didn't say "Service Engine Soon" or anything. I ran the CEL and got error code P0521. And ideas, help or suggestions would be great.
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Related Topics  Changed oil sending Unit. oil pressure gauge pegged on high   Oil Pressure Gauge dropped to ZERO!   oil cooler line failed. oil everywhere low oil pressure.   Low oil pressure reading, too much oil, seized at crank   Oil Pressure   oil pressure   Oil Pressure   No Oil Pressure   Oil pressure   Oil Pressure cannot figure it out   Oil Pressure Issues   Low oil pressure   Oil pressure concerns   Oil Pressure Sensor 
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Re: Oil Pressure gauge P0521

Postby ASTE25 » Jan 13 2012, 1:38am

Have you checked your oil level? It sounds like it may be low and you are picking up air at the pickup when you slow, causing the oil to slosh around.
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Re: Oil Pressure gauge P0521

Postby BigRedZ71 [OP] » Jan 13 2012, 1:41am

Oil level is fine. Changed my oil about two montsh ago and I don't burn through any.
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Re: Oil Pressure gauge P0521

Postby ASTE25 » Jan 13 2012, 1:46am

Have you checked the pressure sensor to see if it is leaking. Sometimes when they start to leak, they will read faulty.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
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Re: Oil Pressure gauge P0521

Postby BigRedZ71 [OP] » Jan 13 2012, 2:11am

The sensor itself leaks? Is that on the driver side of the block some where around the fuel rail? I thought about just ordering a new one but money is kind of tight and didn't want to be out $50 and have it possibly not fix my problem.
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Re: Oil Pressure gauge P0521

Postby ASTE25 » Jan 13 2012, 2:13am

They have been known to leak (at least on most vehicles). It should be on the drivers side rear of the engine near the fuel rail / cylinder head.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
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Re: Oil Pressure gauge P0521

Postby BigRedZ71 [OP] » Jan 13 2012, 2:15am

Thanks. I'll give it a look tomorrow afternoon, this blowing snow makes it hard to work on your truck.
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Re: Oil Pressure gauge P0521

Postby ASTE25 » Jan 13 2012, 2:44am

That's why I spend my extra money on my shop. lol.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
User avatar
ASTE25
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 10912
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Re: Oil Pressure gauge P0521

Postby BigRedZ71 [OP] » Jan 13 2012, 4:12pm

New symptom. The AFM won't kick in, running V8 mode all the time now.
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Re: Oil Pressure gauge P0521

Postby ASTE25 » Jan 13 2012, 7:34pm

I'm not that up to speed on the AFM system. Let us know if you find out what it winds up being.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
User avatar
ASTE25
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 10912
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Images: 21
Blogs: 0
Joined: Jan 03 2011, 6:37am
Years of membership: 3 years of membership3 years of membership3 years of membership
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