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Volt and Oil Pressure Gauge Variations

mopac

By mopac
in Troubleshooting & Recalls

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mopac Enthusiast

mopac

Posted
Posted

Only have 1,500 miles on my new 2018 Silverado 1500 so far.  I've been watching the behavior of the gauges and although I think everything is fine, I wanted to see if others have observed these same variations.  

 

Oil Pressure - Normally while driving this is straight up and down at 40.  However, I noticed yesterday that when I pulled into the driveway and the engine was just idling it dropped to a bit under 30. (See attached photos at idle 500rpm and revving at 1,000rpm.)   If I revved the engine to around 1,000rpm it would go back up to the usual 40.    Given the importance of oil, just want to make sure this is operating as designed.

 

Voltage Gauge - Usually, particularly when first starting, this is also straight up and down at 14 volts.  However, regardless of engine RPM, this will at times drop down to more like 12.5-13.0  as seen in both attached photos - again regardless of engine RPM.  

 

OilPressureIdle.thumb.JPG.e5800ae04dfb3df53c19a6e7bbdd2741.JPGOilPressureReving.thumb.JPG.ecbbbc0e3dec62f3bc439426ddc43c56.JPG

Sierra706 Senior Enthusiast

Sierra706

Posted
Posted

Charging system engages alternator as needed. Normal to see instances when alternator is not charging the battery because it’s already full and electrical load is low.

Oil psi changes with RPM. Idle is usually 30psi when warm and will increase as the RPM increases. Above 3000rpm you will see it increase to 50 and beyond as revs continue to increase.


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Darmichar Enthusiast

Darmichar

Posted
Posted

I had a 2014 I put 88,000 miles on, have a 2018 now.  The oil pressure cold will run around 40, warm it up and it will drop to around 30.  Idling it will be around 20 hot.  Run the engine up to 3,000 RPM and above and the second stage will kick in and run the pressure up to 60 (hot)-80(cold)PSI.

 

Your voltage gauge is normal, too.  Ran like that in both my trucks.  Charges at 14 or so when I first start it then drops to where yours is in the pictures after running a while.

mopac Enthusiast

mopac

Posted
  • Author
Posted

Thanks guys.  I suspected this was operating as designed, but just wanted some confirmation.  

 

I haven't had a GM vehicle since 1994.  So far, I just really love this truck.  My only complaint so far is how easy the water based paint chips and scratches.  I have a small scratch about 2" long near the driver door handle and 2 chips low below the trim strip on the same door.  So far that's it, but I've been so careful about where I park, I can't figure out where either came from.  And I've read complaints about this on here from many others.  But otherwise, just really love this truck.  

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