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Old 09-04-2022, 04:34 PM   #1
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DEF Issue on 2020 IH-45

HELP! My level indicator on the DEF jumps out of a sudden from full to 1/3. After a stop at TA, filling up the tank (for 1 GAL), it shows still 1/3. When the DEF shows empty, but it is still full, I get sidelined. No leak in the tank. Tank is still full. What can I do. Is it possible to disconnect or bridge the system in a case like this?
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Old 09-04-2022, 04:40 PM   #2
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If your DEF tank sensor is the same as the one used by Freightliner, International or Spartan then a DEF Sensor Simulator might work but as far as I know, nobody has ever tested one on a Pevost IH-45 chassis.
Have you called Prevost or Foretravel and what did they say?
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Old 09-04-2022, 05:01 PM   #3
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do you have a spartan chassis, if so I have a 2021 realm and have built and tested a simulator and it works great.
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Old 09-04-2022, 05:10 PM   #4
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@MrFix, that a very generous offer but I believe an IH-45 is a Prevost chassis with a Volvo engine.
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Old 09-04-2022, 06:50 PM   #5
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@MrFix oops, I misread your post. My mistake!
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Old 09-04-2022, 07:01 PM   #6
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Originally Posted by Zampano View Post
HELP! My level indicator on the DEF jumps out of a sudden from full to 1/3. After a stop at TA, filling up the tank (for 1 GAL), it shows still 1/3. When the DEF shows empty, but it is still full, I get sidelined. No leak in the tank. Tank is still full. What can I do. Is it possible to disconnect or bridge the system in a case like this?
Prevost USA should be able to help and they have a network of factory and independent shops. I hope you're near one.

A year ago I had "an artist who won a TV show competition" arrive to his gig at 5MPH. Sidelined the coach in a public park for 5 days while Prevost and Volvo valiantly tried to "fix" what was ultimately a defective DEF sensor or AD converter. I think I posted a pic of the coach in one of the "DEF is evil" threads here... but new parts and an hour later and the coach was back up to speed.
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Old 09-04-2022, 10:21 PM   #7
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I don’t know why I looked at the OP post and though it was a Prevost but it is apparently a Spartan K-3. So, yes, a DSS should work and allow you to get to a convenient stopping place to get repairs done without getting derated. Do you have a DSS (DEF Sensor Simulator)?
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Old 09-04-2022, 11:22 PM   #8
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If your DEF tank sensor is the same as the one used by Freightliner, International or Spartan then a DEF Sensor Simulator might work but as far as I know, nobody has ever tested one on a Pevost IH-45 chassis.
Have you called Prevost or Foretravel and what did they say?
I trying to contact FT. But it’s labour weekend…
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Old 09-04-2022, 11:24 PM   #9
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I trying to contact FT. But it’s labour weekend…
IH-45 is a Foretravel with a Spartan K4 Chassis and a Cummins ISX 15 605HP engine.
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Old 09-04-2022, 11:25 PM   #10
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Thanks to all for the hint with the Simulator. I try to get one.
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Old 09-05-2022, 01:12 AM   #11
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do you have a spartan chassis, if so I have a 2021 realm and have built and tested a simulator and it works great.
Thank you. Good hint. Will try to get one of those simulators.
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Old 09-05-2022, 01:14 AM   #12
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No. Do not have yet. Where can I buy? BTW: Spartan K4 Chassis.
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Old 09-05-2022, 07:29 AM   #13
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Generally you order parts and build it yourself. Sometimes individuals may offer to sell you one they no longer need or even just loan you one if you have an emergency and are stranded.
This website explains everything

https://defsim.myervin.com/
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Old 09-05-2022, 07:35 AM   #14
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Prevost USA should be able to help and they have a network of factory and independent shops. I hope you're near one.
The IH-45 is on a Spartan chassis.

Foretravel isn't a Prevost converter (well, rumor has it they did acquire a chassis to try a prototype years ago). Folks seem to be confusing "IH-45" with "H3-45", the latter of which is a type of Prevost chassis.
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