Problem with my Superduty.

def heater might be dirty if comes on cool moist days its seeing it not burning off so throws a code

P204B
Possible causes:
Slow responding reductant pressure sensor
Damaged reductant pressure sensor

Oh and go to a Powerstroke forum and read up/ ask the question. Going to be a lot more pertinent info you can digest.

Idk what the best one is now. Thedieselstop I think?

kydale wrote:
Doesn't seem to be using any more Def than normal. Truck runs like it always has. Service engine lite once on stays on till I shut engine off. Restart sometime it's on and sometimes not.

Could be some intermittent condition or an issue with a non essential part (when it's warm) like Kaytegs thing with the tank heater.
Have you cleared the code and see how long it stays off?
Just seat of the pants speaking if it's using def like it always does and is also regen ing like normal, it may be tough to diagnose until something actually fails without throwing parts at it.

If it were me, id consider riding it out until a physical symptom presents itself.

I had a check engine light come on on my 2011, I can't remember the code but it was for the DEF tank heating element. I wired in a resister to mimic the blown heating element and it caused the check engine light to come on intermittently (I guess the resistance wasn't quite right). I ended up purchasing an entire DEF system from someone who deleted his new F450. The F450 has a different part number for the def tank but the only difference in the part was that the sensor for the low def indicator sensed a slightly higher level on the F450. Anyway it cost me $300 for the parts and I did the labor myself.

Doesn't seem to be using any more Def than normal. Truck runs like it always has. Service engine lite once on stays on till I shut engine off. Restart sometime it's on and sometimes not.

Is it using def at the same rate it normally does?
When you clear the code, how long before it throws the code again?
Help see if it's a sporatic issue w the pump presuming that's what the code is for like you said.
Find a shop that knows what they're doing. Sounds like your dealer techs are parts throwers.

All else fails, if the reaper cost gets anywhere near what it cost to delete it, delete that sucker and enjoy a healthier truck. (If you're not in an emissions area)

I'm outside the five years.

donn0128 wrote:
Emission systems, arent they warranted for 100K miles?
Early 6.7L Fords had a lot of lift pump issues also.

Thought emissions components were 5/100?

Emission systems, arent they warranted for 100K miles?
Early 6.7L Fords had a lot of lift pump issues also.