I've noticed when every I turn the key on the oil pressure immediately goes up to 60-70 psi. even if the engine isn't running. It can set two days and it still goes up. When the engine is running it registers the same.

Could the sensor be bad or is this normal?

 

Mine say Zero from the time the key is turned on,

 

I bet the wire is off the sensor

 

Mine says zero till runs a second or so. the figure is a calculated pressure - not actual anyway. Open circuit will show hi pres.

 

If this is on the 2001 in your sig, the pressure sending unit is bad, and will soon send your dashboard into fits of "CHECK GAUGES!!!!"

The oil pressure sending unit is a $180-250 piece from a parts house. Dealer price is unreal. Cummins offers a silly price on the part, which is worth about $20 tops in my opinion. I got Part number 4921511 for $85, which is a direct replacement.

There is a not so direct replacement, which is a single pin sender and wiring harness that adapts the single pin to the truck wiring. Part number is 3408428 from Cummins. You will need a reflash for the PCM so it understands the new sensor.

 

Mine used to work when I bought my truck in May 07, a month or two later it does the same as the above poster, it goes over to the high side of the gauge, engine running or not, its been 40,000 plus Kilometers and my check gauges has yet to come on

 

Mine did the same thing as the original posters for awhile then started going from pegged to zero. Thats when you get the "check gauges" light going nuts. Changed the sender and all is well again.

 

Thanks guys, I thought the sensor might be the problem. I haven't had any "check" gauges or lights yet. I'll check the wire on the sensor first. If not, I'll add it to the list to replace.

Thanks Max for the part number.