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Oil pressure drops when temperature is reached

Adoomie Abdallah
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Adoomie Abdallah Enthusiast

Adoomie Abdallah

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Posted

2014 gmc Sierra Denali 6.2

Oil pump replaced not too long ago maybe 30xxxkm

All maintenance done on time and early 

No signs of anything bad in oil when changing oil

 

Issue I'm having is when my truck gets up to temperature, the oil pressure will drop to 6-10psi on idle. I have the p06dd light on, but it only comes on when I get it to temperature and idle for 5 min. If I don't let the truck idle when at temperature, the p06dd light doesn't come on. Also if I idle on a cold engine the pressures are good and no light comes on either. 

 

It's weird to me that only when the engine is hot, does the light come on and does the pressure drops. When it's below 90-100degrees Celsius, the pressures stay good. 

 

Faulty pump/solenoid or is there another issue I'm missing? 

 

Also replaced oil pressure sensor and have been using updated oil filter from gmc. 

rlcole321 Enthusiast

rlcole321

Posted
Posted

did you have good oil psi right after oil pump change?, if so, then could be variable oil pressure solenoid, (I think the 14's had them), or could be a problem with VLOM for the lifter control for the AFM system, that's at the end of the oiling system, I ran into that when I modified my VLOM after a DOD delete and VLOM modification, I forgot to plug the oiling port just below the oil pressure switch.

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