Simple test: remove the wire from the sender unit, if the needle falls then the sender unit is dead - replace it; if the needle stays the same then the indicator in the dash is dead and it gets iffy - if you have some experience you could replace just it, otherwise you will have to replace the entire dash.
SOURCE: oil pressure gauge reads 80 psi with engine off and pegs running
That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.
Pressure can be verified by reading it with a gauge tool.
If you really have pressure over 70 psi when engine is running then start replacing the oil filter, and check that the oil lines from pump are not obstructed, if there is nothing in there then replace oil pump.
If instead the gauge reads 80 with engine off, that is a defective pressure gauge.
SOURCE: oil pressure gauge stays at top, about 80 psi, is this normal
80 is on the high side for those... possibly a sending unit issue
SOURCE: The oil pressure gauge on my 2004 chevy avalanche
it is probably the gage cluster. chevy has had a problem with this and it was recalled. so you might go to your dealer and ask him if they will replace the cluster. mine did that to but as time went on all the other gages went crazy or stopped working .i had to replace the cluster.
SOURCE: high oil pressure 80 psi on a jeep wrangler, what
Possible stuck pressure relief in the pump or a defective sending unit. Try putting a container of Marvel oil in there and see if it helps. Also putting a mechanical pressure gauge on it temporarily will give you an idea if the pressure really is that high. if pressure remains that high it can cause the filter to fail and leak. Therefore if you can't find an external cause, then the pump will need to be replaced or you can loose the engine if filter fails.
SOURCE: oil pressure gauge goes to 80 psi when the truck key is turned on
chances are your sending unit is not bad. These dashes have had alot of problems with stepper motors failing in the instrument cluster. does it go to zero when key is off? is it erratic? changes where it sits when running and when off? These are all problems within the cluster itself. It is not cheap to take this to the dealer. THey will want to replace the cluster. these clusters can be repaired for half the cost if you know where to go. Not sure yet what the rules are on here but i can repair these for about 325 verses over 600 from dealer and then reproggramming costs! One other note. Chevy has a recall on these! call you local dealer and ask what the criteria is for the recall. You may be able to get it repaired for free if you meet the time frame and mileage requirements.
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