[Sal1978]

Im a new member. Love the truck but recently had a P2457 malfunction light come on periodically even after i erase it. Says P2457 dpf pressure differential high. Happened soon after i got a LOW DEF warning on highway. I didnt empty it but it was low. I since then topped it off to full and now it sits at 4500 km range and doesnt use any def. What i think is happening is regen isnt happening and DPF is dirty. I have a service appt in near future. Any thoughts feedback?

 

[Blue-jean]

I recently topped of my DEF tank when it was reading 600 km to empty I filled it the range went to 12000 km when full. 4500 km on a full tank seems low.

 

[Sal1978]

yep. i wonder if its a sensor issue or does the def have a pump that pumps fluid to the regen injectors?

 

[Sal1978]

now i erased code a 4th time and now it seems to be working agian. its starting to use DEF and no more light