The truck just lost oil preasure so the guage says but the measage senter says nothing. took it to shop replaced sensor and then both batteries got truck back then engine light was on let truck run for 20 minuets and oil gauge dropped again but for 2 days after replaceing batteries it was good please help
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Re: oil preasure guage
It would be best to have a manual gauge installed on truck to check pressure. It is most likely a problem in the cluster,I have replaced quite a few for this problem.depending on your mileage chevrolet had an extended warranty on clusters might wanna contact dealer and see if yours is covered.
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The guage could be bad and losing connection triggering the message. My dads Tahoe reads low oil pressure but the sensor connection or stepper motor that moves the guage could and have had a history of being faulty.
Check your oil level first and make sure its at the correct level. A couple of things, if your guage is going up it's a bad guage/sending unit are easiest checks. If it goes way up while driving you probably have an oil passage blocked somewhere causing the pressure to spike maybe a spun bearing (lower motor). Does it make any rattling/knocking noise? If not I would get it checked out ASAP, low/high oul pressure can lead to severe engine damage/failure.
I had the same problem and ended up changing the oil pump and it did not fix it. (Peace of mind anyway and it was cheap) I replaced the pressure sensor (that happens to be tucked in deep between the back of the engine and firewall) and the pressure gauge worked just fine after that.
It could be a faulty oil sending unit, but it would be advisable to have the oil preasure checked with a mechanical guage to determine if it is a sending unit or low oil preasure. Oil preasure low enough to allow the light to come on is low enough to possibly cause major engine damage.
There is the possibility the oil sending unit might be bad, but it is more likely that the oil preasure drops to a dangerous level when the engine is warm and the oil thins out. It would be advisable to take it to a shop and have them check the oil preasure with a remote preasure guage just to be sure before it could cause major and very expensive damage.
You may have a Faulty Oil Pressure Sender.
Here are some reason why your guage is bouncing:
Corrosion or faulty electrical connections
If the oil pressure gauge is pegged low after the engine is running, or is pegged high after the engine is running, or if there is intermittent illumination of an oil pressure indicator light, the sender could be faulty
You can find the oil sensor on the left hand side near the Oil Filter, as long as you don't hear your lifters ticking and making lots of noise. it's not your oil pump failing.
Good luck and hope this helps
There could be several reasons for the problem. The first is the plug is off the sensor, thus no reading. Second the sensor itself has gone bad. Buy a new one and replace it, they are not too expensive. The guage in the dash has gone bad (big pain, buy aftermarket unit and install) and forth the ECM has decided to go bad on that particular guage (very expensive to replace). Have a shop put a trouble code reader on the truck and see what it says the problem is and go from there. You can check the wire to the sensor yourself. Also follow the wiring back from the sensor and make sure there isn't another plug that is not all the way plugged in. A lot of times when the vehicle is worked on and a plug is disconnected and put back together one of the pins in the plug will slide back and not go into the plug, thus causing a problem. So look for that also. Good Luck, RAC
try checking how much fuel preasure you are getting under the hood, there is a valve that looks similar to a tire valve that you screw a guage onto, that engine must recieve no less that 60 psi fuel preasure to make the fuel injectors even fire. try replacing the fuel preasure regulator.