Rockwell Posted April 27, 2017 Share Posted April 27, 2017 Check engine light came on, truck running fine, all gages are great. What is this code? Can I run? 2011 MP8 445 SA 0 SPN 3556 FMI 4 Cant seem to find it online, any help is greatly appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/ Share on other sites More sharing options...
Keffer inc Posted April 29, 2017 Share Posted April 29, 2017 "Aftertreatment Hydrocarbon doser" Fmi 4: voltage is below or shorted circiut. Or ground is shorted. Possible symptoms are "regen not possible" check engine light and MIL light. It's says possible fixes are "check wire harness and/or replace doser. Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-368648 Share on other sites More sharing options...
Keffer inc Posted April 29, 2017 Share Posted April 29, 2017 I've had several codes come on over time and they almost all go away on their own. Check your wiring for obvious thinks and keep rolling until you need to do a parked regen. Then I guess replace it then if I doesn't go away. Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-368651 Share on other sites More sharing options...
Rockwell Posted April 30, 2017 Author Share Posted April 30, 2017 Thank you very much Keffer , Inc! I have the truck in Mack now, I was afraid to keep running it, although it was running just fine. I'll post the outcome to hopefully help others down the line. That's good info that you've experienced other codes that clear on their own. I tend to panic when I get a MIL light as I'm fearful imminent shut down or derate will soon follow. Don't like computers in trucks! Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-368739 Share on other sites More sharing options...
Mackpro Posted May 1, 2017 Share Posted May 1, 2017 Heres a list of the "SPN" codes SPN fault codes.pdf 1 Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-368785 Share on other sites More sharing options...
Rockwell Posted May 1, 2017 Author Share Posted May 1, 2017 Awesome! Thank you. Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-368831 Share on other sites More sharing options...
Rockwell Posted May 3, 2017 Author Share Posted May 3, 2017 Truck still in shop. Anyway, this is copy and pasted from repair estimate provided to me by Mack... CHECK ENGINE LIGHT IS ON - CHECK & ADVISE - NEED ESTIMATES Parts: (1.0) INJECTOR (21089234) Complaint: CHECK ENGINE LIGHT IS ON - Cause: HOOK UP LAP TOP TO CHECK CODES. SPN3556FMI4 ACTIVE FOR 7TH INJECTOR CIRCUIT FAULT. PERFORM GD CIRCUIT CHECKS TO FIND HIGH RESISTANCE IN 7TH INJECTOR CONTROL CIRCUIT. ADVISE TO REPLACE 7TH INJECTOR Correction: NEED TO REPLACE 7TH INJECTOR I gotta tell ya, I like a clean environment as much as the next guy, but emissions stuff is ridiculous. You wont choke to death breathing the air, but you'll financially choke to death paying for it! My next truck is gonna be so old, the Smithsonian will be jealous! Wanna go back to the good ole days of trucks. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-368939 Share on other sites More sharing options...
Keffer inc Posted May 29, 2017 Share Posted May 29, 2017 What did that cost you? Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-371035 Share on other sites More sharing options...
Rockwell Posted June 5, 2017 Author Share Posted June 5, 2017 (edited) The 7th injector r/r = $1254.62 Now here`s where I really got stupid... When I dropped the truck off, i knew I had a leaking wheel seal so I said go ahead and fix that to...well turns out I had 2 leaking wheel seals. No worries, $650.72 bananas later, fixed. And even greater stupidity.... I tell the shop manager (this is before any diagnosis) "Since you're going to be in the computer poking around anyway, can I get a few parameters changed?" ..."Sure!, what ya need?". Now at this point i'm assuming they just do this free as a courtesy, ya know they are in there anyway right, change a 1 to a 0, a 0 to a 1 in the settings...no big deal, and ya know Mack is so understanding of us working guys. Well... Change max road speed to 80mph = $70.00 Allow idle ramp up using cruise controls = $210 Remove fuel bonus/penalty function = $000 I got this one FREE! And wait! My stupidity doesn't end there... "Hey, ya know what, while ya have it, charge the AC. It works fine but just isnt super cold"..."Sure thing! You got it!" Charge AC = $331.80 (yes, charge only, no repair to AC) My grand total, $2,711.71 and ONE FULL WEEK in the shop. Yup, I dropped it off on a Friday, and I never got it back until the following Friday. And on SO MANY levels, I have only myself to blame, beginning with the purchase of a truck later than the year 2000. Edited June 5, 2017 by Rockwell 1 Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-371522 Share on other sites More sharing options...
Keffer inc Posted June 5, 2017 Share Posted June 5, 2017 Yep, I'm convinced my 1999 CH613 is more reliable. Less mpg but still higher profits. Quote Link to comment https://www.bigmacktrucks.com/topic/49665-fault-code-help-spn-3556/#findComment-371541 Share on other sites More sharing options...
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