Oil Summary Page on Instrument Cluster

[Gen77]

Cummins even calls it a switch, not a sensor. The part crosses all the way back to 2007.

View attachment 88818

Not sure if it changed for 2025 or not.

Hadn’t seen the Cummins part listing, Mopar refers to it as a sensor. Either way, tried a few different switches & they did not work. There is something else going on with this circuit & how the computer sees it.

Received the new part & it works. It does not fully close the circuit at idle, just increased resistance.

 

[AH64ID]

Hadn’t seen the Cummins part listing, Mopar refers to it as a sensor. Either way, tried a few different switches & they did not work. There is something else going on with this circuit & how the computer sees it.

Received the new part & it works. It does not fully close the circuit at idle, just increased resistance.

Many switches and sensors aren’t as simple as they used to be.

At the end of the day the ECM isn’t seeing true pressure and neither are you on the dash.

 

[Gen77]

Many switches and sensors aren’t as simple as they used to be.

At the end of the day the ECM isn’t seeing true pressure and neither are you on the dash.

I would agree the true pressure is likely not displayed, although it does seem somewhat close when I ran a test gauge.

My larger concern was it being a simple switch (hoped it was) & trying to fit something more reliable. The Mopar part (assume it’s just a repackaged Cummins part) has failed multiple times in 75k miles. The dealer thinks my oil filter relocation is the cause.

 

[AH64ID]

I would agree the true pressure is likely not displayed, although it does seem somewhat close when I ran a test gauge.

My larger concern was it being a simple switch (hoped it was) & trying to fit something more reliable. The Mopar part (assume it’s just a repackaged Cummins part) has failed multiple times in 75k miles. The dealer thinks my oil filter relocation is the cause.

What year truck?

The dash and actual oil pressure are rarely close, it's a joke how far off it usually is in my experience.

The reason the dash is a fake oil pressure reading is due to the normal pressure swings of the Cummins, 15-60 psi in a very small rpm window. Dodge was getting too many warranty service calls due to the normal swing so they started ~2001 just re-programming the trucks to display a fake gauge while they still had a pressure transducer installed. By 2003 the pressure transducer was gone and a one-wire switch has been there ever since and the oil pressure swings like a gas engine at best and certainly not like an ISB.