2019 Ram — The check engine light turn on

[VegaRam77]

Hi!
Just one week after buy our new Ram Diesel 6.7 ******* motor the check engine light turning on when the tank is full. ‍ Any idea??? Help!!

 

[crash68]

Without the error code that's causing the CEL, it's a guessing game.
If you don't have a code reader, consider buying one like the OBDLink MX
With as new as the truck is, swing back to the dealer and let the warranty deal with it.

 

[VegaRam77]

I have a code P870....

 

[RamCares]

Hi!
Just one week after buy our new Ram Diesel 6.7 ******* motor the check engine light turning on when the tank is full. ‍ Any idea??? Help!!

Hi VegaRam77,
We are sorry to hear that you are experiencing this concern on your new Ram. If you decide to have your dealer address this, please send our team a private message and we would be happy to add an extra layer of assistance!
Alex
Ram Social Care Specialist

 

[tjfdesmo]

Here is a quick copy/paste regarding this code I dug up on the web.

P0870 is indeed an OD Hydraulic Pressure Test fault. "Fluid Pressure Sensor C Circuit" is a generic description (used by some scan tools). OD Hydraulic Pressure Test is the manufacturer-specific description used by FCA. Kind of like asking "What kind of vehicle is that?" and getting told either "It's a pickup truck" (generic) or "It's a 2018 Ram 2500 Mega Cab 4x4" (manufacturer-specific).

P0870 means that the PCM tested the OD pressure switch (by momentarily turning on pressure to the OD clutch, and watching for the pressure switch to close), and did NOT see the pressure switch respond. This is a relatively rare fault.

And, not to be harsh, but please, please, you have a Cummins engine in your truck. No G in Cummins.