Zero Oil Pressure???

[CamaroDreams76]

Dug up the service bulletin for the relief valve. As stated above, if they actually put a mechanical gauge on the engine and it read zero then yes i would begin tearing it down. If that was not completed then 100% I would start with replacing the sensor.

PIP4158C: Low Oil Pressure Due To Seized Oil Pressure Relief Valve - (Dec 29, 2009)


Subject: Low Oil Pump Pressure due to Seized Oil Pressure Relief Valve

Models: 2008-2009 Buick Lacrosse, Allure (Canada Only)
2007-2010 Cadillac CTS-V, Escalade
2007-2010 Chevrolet Avalanche, Corvette, Silverado, Suburban, Tahoe
2007-2008 Chevrolet Monte Carlo SS
2007-2009 Chevrolet Impala SS, Trail Blazer
2009-2010 Chevrolet Colorado
2010 Chevrolet Camaro
2007-2010 GMC Envoy, Sierra, Yukon
2009-2010 GMC Canyon
2008-2010 Hummer H2
2008-2010 H3 Alpha
2008 Pontiac Grand Prix GXP
2008-2010 Pontiac G8 GT
2007-2009 Saab 97x
with the Following Aluminum V8 Engine RPOs:
L76, L77, L92, L94, L99, L9H, LC9, LH6, LH8, LH9, LS2, LS3, LS4, LS7, LS9, LSA, LZ1

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

Some customers may complain of low oil pressure, no oil pressure, and/or engine noise, which may be the result of a sticking oil pump pressure relief valve. In some instances, this may occur intermittently if the valve frees up when the engine cools down.
Recommendation/Instructions:

If SI diagnosis isolates low mechanical oil pressure at the oil filter housing and oil pressure sensor, replace the oil pump, flush the oil cooler lines (if equipped), clean the inside of the oil pan, change the oil and filter, and re-evaluate the concern.

Notice: If an engine noise is noticed after replacing the oil pump, follow the SI diagnosis and repair the engine as necessary.

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.

[Joe.G]

The mechanical gauge is reading zero pressure what else is there to check, we are beyond a sensor at this point. So what is the reason for the mechanical gauge to read zero?

[King Nothing]

Originally Posted by Aqua Blue RS/SS

Yep I would if they legitimately put a gauge on it and it had zero pressure. I understand what you are getting at. If there was no verification that there wasn’t any pressure then swapping a sensor would make sense. With zero pressure, obviously the more you run it the more you are risking serious damage. As was said above the LS3’s are now to have oil pump issues, many of which have been documented right here on this site.

Wow I reread the OP, not sure why the bottom didn’t stand out to me and yup if the mechanical gauge says 0, yup start a tear down. Or just buy a new block and swap accessories.