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Doug29 · 05-30-2023, 05:18 PM

So on our way back to Maine, our 2019 Tiffin RED threw a LOW DEF level alarm then a check engine light. Checked def level tank 2/3, check engine manual said sometime soon. Then next day “very low def “ same thing just filled def then shutdown engine light. Lucky we were in a campground just leaving pulled back into site at 5mph. Shutdown and went to check def, full. Restarted engine no alarm’s except check engine.
So is this just a bad level sensor or wire or a larger issue. I am 550 miles from home.

Warhorse6 · 05-30-2023, 05:52 PM

Pull your codes off the dash and see what they say. Hope I’m wrong but suspect you’re having a def head failure.

**Lt Dan** · 05-30-2023, 06:47 PM

Sounds like a failing DEF head so your best bet is to call Tiffin. It may still be covered under warranty. Those are the same symptoms ours had when the head failed.

Doug29 · 05-31-2023, 05:30 AM

Codes 3364 and 3521 looks like quality not quantity
Found a local Cummins dealer said he has the part can repair today

Warhorse6 · 05-31-2023, 05:03 PM

Absolutely great news. Happy motoring.

Doug29 · 06-01-2023, 10:05 AM

If you ever find yourself in the Rochester NY area and need Cummins / Freightliner work I recommend Tracey Road Equipment in Henrietta NY. I texted them at 8 pm received a call back at 7am, they had the DEF head in stock, I got there around 8:30. I had the tow hooked back on and out of their yard at 11:30. Great great people.
All under warranty just signed the paperwork no cost.

thegats1 · 06-01-2023, 10:29 AM

Quote:

Originally Posted by Doug29

If you ever find yourself in the Rochester NY area and need Cummins / Freightliner work I recommend Tracey Road Equipment in Henrietta NY. I texted them at 8 pm received a call back at 7am, they had the DEF head in stock, I got there around 8:30. I had the tow hooked back on and out of their yard at 11:30. Great great people.
All under warranty just signed the paperwork no cost.

Same happened to my 2019. My simulator bailed me out until I could get it in. Luckily it was built and standing by for the pending failure. After I plugged it in, everything ran fine until I could get it into Cummins. I still keep it in case it happens again.