j_martell Posted April 2, 2014 Share Posted April 2, 2014 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. Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/ Share on other sites More sharing options...
Kyle 537 Posted April 2, 2014 Share Posted April 2, 2014 S Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-240400 Share on other sites More sharing options...
turckster Posted April 5, 2014 Share Posted April 5, 2014 ECM SPN 5392, Aftertreatment Diesel Exhaust Fluid (DEF) Dosing Valve Loss of Prime – MID 128 PSID 121FMI 31:Aftertreatment Diesel Exhaust Fluid (DEF) pressure build up failure-Possible Causes:Empty DEF tankDEF filter cloggedDEF inlet pipe leak or blockageDEF pump assembly Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-240670 Share on other sites More sharing options...
j_martell Posted April 5, 2014 Author Share Posted April 5, 2014 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. Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-240760 Share on other sites More sharing options...
85snowdog Posted April 5, 2014 Share Posted April 5, 2014 I can imagine the site foreman was not impressed. Did the 88 have to save the day? Quote Keith Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-240762 Share on other sites More sharing options...
j_martell Posted May 12, 2014 Author Share Posted May 12, 2014 The 88 always comes through....lolIt 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...... 1 Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245047 Share on other sites More sharing options...
j_martell Posted May 12, 2014 Author Share Posted May 12, 2014 Just around the corner from Mack and I got this "new" error messageWhen I got to Mack, I checked the codes and got the same old 5392 loss of prime code and this one Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245048 Share on other sites More sharing options...
bbigrig Posted May 13, 2014 Share Posted May 13, 2014 DEF pumps are a problem.... Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245282 Share on other sites More sharing options...
j_martell Posted May 13, 2014 Author Share Posted May 13, 2014 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 Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245283 Share on other sites More sharing options...
bbigrig Posted May 14, 2014 Share Posted May 14, 2014 "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! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245450 Share on other sites More sharing options...
jnr_ate Posted May 18, 2014 Share Posted May 18, 2014 DEF are a big problem, we learnt to replace pump unit, and dosage as a pair. the first 24volt ones Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245917 Share on other sites More sharing options...
wheeler73 Posted May 18, 2014 Share Posted May 18, 2014 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. Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-245992 Share on other sites More sharing options...
arnoldpangan930@ymail.com Posted August 2, 2017 Share Posted August 2, 2017 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 Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-376455 Share on other sites More sharing options...
GWT Posted January 12, 2018 Share Posted January 12, 2018 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! Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-389521 Share on other sites More sharing options...
HeavyGunner Posted January 12, 2018 Share Posted January 12, 2018 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. Quote The problems we face today exist because the people who work for a living are outnumbered by the people who vote for a living.The government can only "give" someone what they first take from another. Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-389523 Share on other sites More sharing options...
Ezee Posted January 12, 2018 Share Posted January 12, 2018 after your warranty goes off can this stuff be deleted like Cummings and Detroit and some of the others? Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-389525 Share on other sites More sharing options...
1965 Posted January 12, 2018 Share Posted January 12, 2018 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! Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-389532 Share on other sites More sharing options...
Hvtech Posted May 10, 2019 Share Posted May 10, 2019 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. Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-422367 Share on other sites More sharing options...
steeler Posted May 12, 2019 Share Posted May 12, 2019 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. Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-422535 Share on other sites More sharing options...
mp8_macky Posted July 13, 2019 Share Posted July 13, 2019 If you are deleting it, I recommend my guy https://truckecmtunes.com Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-427668 Share on other sites More sharing options...
Roger LaFleche Posted June 10, 2021 Share Posted June 10, 2021 2015 Mack CXU613 PEN. MP8 505hp. After treatment problem started at 475k now has 545k presently in the shop for the same. About every 2-3 wks. Cost so far approx. $ 25,000.00 no telling what this will cost. Same codes keep reoccurring. Plus lost income I figure maintenance cost about $ 1.00 a running mile. Agree with steeler, junk!!! Never again. Have another make on order due in Sept. can't wait, hope I can survive until then. Quote Link to comment https://www.bigmacktrucks.com/topic/35275-scr-fault/#findComment-475061 Share on other sites More sharing options...
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