Dreaded DEF Head Sensor Failure - Perfect Timing & Location

[specmga1]

Got the dreaded DEF Head Sensor failure. About 1 hour into our drive on Friday I got the 1st code. About an hour later got the 2nd code while fueling up at a Pilot off I-40 in North Little Rock, Arkansas. Called Spartan. Was advised to get to a Cummins Service Center right away & they would ship the replacement part right away. I asked them where is the closest Cummins location? Lo & behold they told me there was one 200 yards away - lucky us! Called them right away. Told me to come over & that they have RV hookups - again, lucky us!. They ordered the part right away. Will be here on Monday. Parts & labor will be covered by Spartan. Excellent service from Spartan & Cummins. Best case scenario, I guess, if you’re going to have this problem! I just wish that Cummins would resolve this problem once and for all! Service advisor here told me that they are constantly replacing them on all types of vehicles & that Cummins still hasn’t found a permanent fix for this.

[tom chelbana]

Spartan and Newmar taking care of us owners.
Newmar Man

[Dutch Star Don]

One of the other posters on here lost his DEF head on his 2019, one day into his trip last month. I know some are stocking a spare in the coach, but they're pricey.

[10 fan]

Can you share the codes you got ? Thanks

[Johninar]

Originally Posted by 10 fan

Can you share the codes you got ? Thanks

it will vary as it progresses.

3364 DEF Quality
3031 high temperature
1791 Tank level

The head just stops communicating with the computer.
Hopefully this generation 6 header will do the trick. Head is certainly different from the gen 4 head.

[RRR]

Hope you bought a lottery ticket too!

[Vickie 4369]

Originally Posted by Johninar

it will vary as it progresses.

3364 DEF Quality
3031 high temperature
1791 Tank level

The head just stops communicating with the computer.
Hopefully this generation 6 header will do the trick. Head is certainly different from the gen 4 head.

any chance you have the part number of the new generation head unit?

[mchero]

WOW
Pretty sad not knowing if you DEF head is going to fail. Been reading LOTS of posts on the subject. Not good!
Hang in their folks!

[10 fan]

Originally Posted by Johninar

it will vary as it progresses.

3364 DEF Quality
3031 high temperature
1791 Tank level

The head just stops communicating with the computer.
Hopefully this generation 6 header will do the trick. Head is certainly different from the gen 4 head.

I checked my codes from yesterdays check engine lights.
3364
3031
1761
Did your check engine light have a check mark ? Did it stay on or go out? How long can you drive? Sounds like I'm next. I was in regen and had to exit the fwy and the light came on for a few seconds. When I got home it came on again for a few seconds and went out.

[Johninar]

Originally Posted by 10 fan

I checked my codes from yesterdays check engine lights.
3364
3031
1761
Did your check engine light have a check mark ? Did it stay on or go out? How long can you drive? Sounds like I'm next. I was in regen and had to exit the fwy and the light came on for a few seconds. When I got home it came on again for a few seconds and went out.

I drove from North Little Rock to the FMCA campground in Cincinnati where I got the full engine derate. Stuck two weeks waiting for backordered part. No part number but I did take pictures of old and new.

The lights stayed on the entire time. It was risky but I was on my way to Spartan and thought we might make it.

[Johninar]

Originally Posted by Vickie 4369

any chance you have the part number of the new generation head unit?

I didn't get the number. sorry

[mchero]

Can you post old/new pics?

[Johninar]

The gen 6 is more vertical, gen 4 is L shaped. There were absolutely no marking or numbers to indicate what version it is.

I hope this helps.

[RonK]

Can someone explain why this problem appears to predominantly affect the Newmar product line? Am I missing something here ??