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Engine code p0521

henry0016

By henry0016
in Ask A GM Technician

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henry0016 Enthusiast

henry0016

Posted
Posted

I just purchased 09 Chevy silverado with a5.3. Just got the code p0521 the oil pressure gauges at idle is around 10 when accelerating goes to 30. Bring it back up to the dealer. Was wondering what the problem could be so I know what they should look for.

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

It could be either the sending unit or the gage. It's hard to tell without testing them both (of which I don't know how to do). Also it could be that your oil pressure really is that low, which also should be tested for.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

they are gonna put a master gauge on it to start ....

 

please dont tell them what to do ,it will not help the relationship ,,,,,

 

not sure what your engine code is ,let me know what the 8th digit is of VIN

 

 






  • Oil Pressure – Minimum – Hot


152 kPa at 1,000 engine RPM

207 kPa at
2,000 engine RPM

228 kPa at 3,000 engine RPM


22 psig at 1,000 engine RPM

30 psig at
2,000 engine RPM

33 psig at 3,000 engine RPM

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

this is for code 3 engine

 

24 psig at 1,000 engine RPM

35 psig at 2,000 engine RPM

38 psig at
3,000 engine RPM

 

this is for warm engine

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

there is an RPM to achieve before looking at oil pressure gauge,,remember that ,,,,

 

and looky what i found !!!!

 

 



#PIP4786: Low Oil Pressure Message Light -
Inspect Valve Lifter Oil Filter - (Apr 5, 2010)



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Subject:
Low Oil Pressure Message/Light - Inspect Valve Lifter Oil
Filter






Models:
2007 Cadillac Escalade






Built before April 1, 2006 with 6.2L L92
Engine






(These engines were built with AFM Hardware but the AFM system was
disabled.)






2009 Buick Lacrosse Super, Allure Super (Canada
Only)






2005-2007 Buick Rainier






2010 Chevrolet Camaro SS






2007-2010 Chevrolet Avalanche, Silverado, Suburban,
Tahoe






2007-2009 Chevrolet Impala






2005-2009 Chevrolet
Trailblazer






2007 Chevrolet Monte Carlo






2007-2010 GMC Sierra, Yukon






2005-2009 GMC Envoy






2007-2008 Pontiac Grand
Prix






2008-2009 Pontiac G8






2005-2009 Saab 97x






With an AFM (Active Fuel Management) V8 Engine RPO: L76, L94, L99,
LC9, LFA, LH6, LMG, LS4, or LY5




The following diagnosis might be helpful if the vehicle exhibits the
symptom(s) described in this PI.


Condition/Concern:

Some customers may complain of a low oil pressure message/light on the dash
and a technician may find a P0521 DTC in the ECM.


Recommendation/Instructions:

If this concern is encountered, follow SI diagnosis. If it indicates that the
Tech 2 oil pressure parameter is low but proper oil pressure is present at the
oil filter housing, inspect the Valve Lifter Oil Filter for debris/sludge that
could be restricting oil flow to the oil pressure sensor before replacing any
parts.


Follow the Valve Lifter Oil Filter Removal and Installation Procedure to
remove the filter for inspection. If the filter is plugged, it can normally be
cleaned with brake/contact cleaner and light shop air. If it cannot be cleaned
for some reason, replace it using the part number listed in the parts catalog.
Do not replace the complete Valve Lifter Oil Manifold just because the filter is
plugged.



#452 - Valve Lifter Oil Filter





1402008.gif




Please follow this diagnostic or repair process thoroughly and complete each
step. If the condition exhibited is resolved without completing every step, the
remaining steps do not need to be performed.






GM bulletins are intended for use by professional technicians,
NOT a "do-it-yourselfer". They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information that could
assist in the proper service of a vehicle. Properly trained technicians have
the equipment, tools, safety instructions, and know-how to do a job properly and
safely. If a condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See your GM dealer
for information on whether your vehicle may benefit from the information.

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