Lowering oil pressure and battery voltage and have no idea why?
What is your question?
My 2011 GMC has a couple weird things going on. At initial start the belt squeals pretty loud. Oil pressure and battery voltage are normal as the truck warms up to normal temp, the squeal is gone. Once the truck is put in drive oil pressure drops below 40psi and fluctuates when the gas pedal is pressed. After about 30 mins of driving the oil pressure tends to stay low but not drop low enough to throw a code. When this happens battery voltage drops but again not low enough to throw a code. Also when I’m drive and stopped at a light the idle is rough.
What makes this problem better or worse?
When truck is hot
How long has your 2011 GMC Sierra 1500 had this problem?
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Hello, first address your battery issue. Ensure you have a properly performing healthy battery in the vehicle, and ensure the charging system is functioning as it should be.
Once you make sure those concerns are eliminated, then focus attention on the actual oil pressure you are attaining. A manual oil pressure gauge should be used to check and monitor pressure. If it's low, it must be addressed. I am thinking it will probably be within specifications.
By the way: oil pressure of the basic engine and the charging system / battery function typically do not set diagnostic trouble codes if out of specification.
I would also look at the belt squeak. Find out why that is happening; it can influence many things including battery state of charge.
Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops
