DEF is emissions, so I’d assume it’s covered. How many miles on your truck?

 

32,500. Pretty sure here in 70 degree So Cal it's 7 yr and 70k for the emissions warranty. Sorry but I’ve been reading on the forum how cold it is elsewhere!

 

P203B code could have just been a hiccup, I'd clear it and see if it comes back, it may not.

 

I cleared the CEL that day, only driven it once since then and hasn’t returned, hopefully a hiccup like you say. We’ve got a Nascar week in Phoenix coming up in six weeks, no hiccups allowed. If it does might have to employ the “ passenger seat eject” button! 😜😜😜 thanks for your input!

 

Well, if it does come back, it won't keep the truck from running normally, no shut down or limp mode.

 

That’s good to know and thank you for the help!

 

 

Thank you for the input Choy348. It’s been almost 2 years since I got the P203B code and nothing since then. Just clicked 40k and have gone thru around a tank and a half of def with no issues. I feel it was a hiccup like Ltngdrvr posted. Happy Holidays!!!!!!

 

Mine was just only 19xxx on it when it happened yesterday, after that i keep on browsing on the net for some answer how, why, and what symptoms how come it happened, even though is always put genuine mopar def on it. Until this pop up yesterday.

 

Others have said the truck will not go into limp mode with the P203B trouble code, and mine never did. Sound like it may be the pump itself With the limp mode on your screen and by reading the dealer recommendation. May be covered under the long term emissions warranty, def system is a major part of the emission system on the truck. Check the supplemental warranty info.