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Second time in a month, cel and a message "SCR Fault, engine will derate soon". Code come back def system loss of prime. Sitting waiting at Mack now, and there's a crew of roofers and a crane waiting on site for me......frustrating.

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ECM SPN 5392, Aftertreatment Diesel Exhaust Fluid (DEF) Dosing Valve Loss of Prime – MID 128 PSID 121

FMI 31:Aftertreatment Diesel Exhaust Fluid (DEF) pressure build up failure-

Possible Causes:

  • Empty DEF tank
  • DEF filter clogged
  • DEF inlet pipe leak or blockage
  • DEF pump assembly

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They had it fixed by 4:00 that day. Looks like a new def doser.... When I got my stuff out of it, they had the steps and kick panel off the passenger side of the fame and were working on taking the after treatment system apart.

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I can imagine the site foreman was not impressed. Did the 88 have to save the day?

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The 88 always comes through....lol

It happens again on Friday morning, so back to the shop it goes. They have had it since Friday @ 10 am and it's still there now, waiting for a def pump and I won't get it back till this afternoon. Good thing there's rain in forecast and I don't have much doing today anyway. But this shit is getting old fast......

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Just around the corner from Mack and I got this "new" error message

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When I got to Mack, I checked the codes and got the same old 5392 loss of prime code and this one

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DEF pumps are a problem....

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That's what I keep reading......and it been in at least 3 times (this last one might have been 4, but my memory sucks) with the damn codes and it keep happening. I was actually starting to wonder if DEF "salts" like fertalizer does, and if the crystals float or sink. Seem every time it's happens the def tank was between 1/4 & 1/2. Maybe plugging the strainer??? But then I also read that the pump pulls DEF from the lines back to the tank on shut down, would that not effectively clear the strainer temporarily???? Crap.....thinking out loud, and now my head hurts....where's my damn beer :)

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"Beer Assistant!!!!"

Yes it pumps it back....But your crystallization issue is the biggest issue I'm seeing. Its never going to go away.

We are stuck with it. Ugh.

Can't wait till my new ones are out of warranty. Yikes!

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DEF are a big problem, we learnt to replace pump unit, and dosage as a pair. the first 24volt ones

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Must be the cooler weather as we don't see too much crystallization or def pump and doser failures here in Florida. I see more nox sensor failures more than anything.

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I have brahman buses from china with cummins 3.8 it has a def,same problem with mach dozing failed to prime,here in papua new guinea mine site its cold and more than 1000 tf altitude,dozing pump always have a problem its happen that new dosing pump it takes only few days and having a fail to prime

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I run 2012 granites off road these systems are pure JUNK!!!

Delete the shat! OTR performance or have genesis tune in NJ reprogram the ECM to turn systems off! Yes cost 2000.00-3000.00 bucks but figure def fluid for year mine were at least 2 times week asking for parked regen at least 3.5hrs down time per week. So figure it all up and I was loosing approx $25,000.00 per yr per truck version no system how do they expect small Indy to survive they don’t give a shit as long as you buy there parts it’s a real shame!

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I’ve been sitting at a diesel repair shop for 3 hours now because of “def dosing” problem. Not sure whether it was a froze def line or a chunk blocking the line. I’m very greatful I’m not an owner operator. 

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 after your warranty goes off can this stuff be deleted like Cummings and Detroit and some of the others?

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1 hour ago, Ezee said:

 after your warranty goes off can this stuff be deleted like Cummings and Detroit and some of the others?

You better sell it or trade it before warranty goes out!

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Mack Trucks are now total Junk. Ever since Volvo Bought Mack They Have Been Junk. The computer systems on these trucks are the worst i have ever worked on . The scanner software is no better. We have Tech tool on our pc and most of the time it fails and we have to repair the software before we can even scan the broken vehicle..! It is very frustrating.. The poor bulldog is ashamed to be on the hood of these turds.

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On 5/10/2019 at 10:18 AM, Hvtech said:

Mack Trucks are now total Junk. Ever since Volvo Bought Mack They Have Been Junk. The computer systems on these trucks are the worst i have ever worked on . The scanner software is no better. We have Tech tool on our pc and most of the time it fails and we have to repair the software before we can even scan the broken vehicle..! It is very frustrating.. The poor bulldog is ashamed to be on the hood of these turds.

I'll give that an AMEN! None of us know what would have been if Volvo had stayed out of it, but this sucks. There is almost nothing I like about Volvo.

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