Need help understanding "New" codes in Paccar engine.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Guntoter, Jul 26, 2015.

  1. Guntoter

    Guntoter Road Train Member

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    A few days ago I had a "Stop Engine" red light on my dash. I didn't get a derate so I drove to the nearest Peterbilt shop. The code was FMI-11 SPN-1231 Fault CAN Bus 2.
    $1,750 later they said they think they may have fixed it. BUT....They didn't. Paccar had no clue what it meant so they just started throwing parts at it. After a Doser valve and humidity sensor the code went away on the dash. YEA!
    It came back on today. Now I have that code and another . SPN: 524287 FMI-31 .
    Anybody have a clue what any of these are?
     
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  3. GrapeApe

    GrapeApe Road Train Member

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    Paccar fault codes suck. I'm told that they care working on a J1939 to OBD2 conversion list, but right now, the only way to get the Paccar fault code is to hook it to Davie. I have a complete list of the OBD faults from the troubleshooting manual, but the truck is telling you a J1939 fault code. I only have a partial list that I've been building, but it's very incomplete. SPN 1231 is CAN Bus fault (which you already know), FMI 11 is "Root Cause Unknown", no help there.

    I have no info on SPN 524287, FMI 31 only means "Condition Exists".

    Sorry I can't help, Paccar dash faults are going to be very tough to get any info on until Paccar can build a truck that can display the faults of their own engines. Or at least a way to convert them to the OBD faults.
     
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  4. Guntoter

    Guntoter Road Train Member

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    The really frustrating part is that a Peterbilt shop can't even find out from Paccar what the codes are. Word to the wise if you're trying to decide Paccar Vs. Cummins. At least Cummins can tell a technician what is wrong when a code flashes, Paccar can't even read their own codes and they still have the nerve to charge customers who come to them for help and leave with the problem still existing.
     
  5. GrapeApe

    GrapeApe Road Train Member

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    PM me an email and I can send you what I have, I have quite a long list, but not complete. From what I hear, Paccar has heard quite a bit of squawking on this very subject. About 2 weeks ago, our Pete dealer said they are working on it, but no ETA. Everytime one of our truck sets a code, I match it with the Paccar OBD fault. I have 3 other friends doing the same and we share info, so the list is pretty good for common problems.
     
  6. magoo68

    magoo68 Road Train Member

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    More often than not you get a code saying " generic fault unknown " correct at next service I had issues for a bit 2 k of warranty work including a new fuel pump I drove 50 miles stop engine light was back on .. So I drove 750 miles did my scheduled drops and got it fixed in Calgary ab I couldn't believe the procedure that paccar requires Winnipeg kW changed wrong fuel pump now it runs better than it ever did .. The kW or Pete shops that work on these engines their hands are tied on what they are allowed to change maybe after warranty they have more freedom it sucks when mechanic knows what is wrong but has to build a case to paccar before he can touch it
     
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  7. Guntoter

    Guntoter Road Train Member

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    I am out of warranty so i can go anywhere to get work done but every shop that i usually go to says they don't want to touch it. At the Peterbilt shop in Texas I just stood there like a moron while on the clock and the tech would email Paccar (wait 30 minutes for a response) then say "well, they think it might be ____". Throw some parts at it, send the report, wait for a response "well that wasn't it, they say to try ____". Im paying $120 an hour plus parts the whole time. If you are thinking about a Paccar engine RUN AWAY NOW!
     
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  8. Guntoter

    Guntoter Road Train Member

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    Update: A month later I still have a dash full of lights. I will give Rush Truck Center some credit for helping me, they reduced my shop rate to $50 an hour and started giving me parts at a big discount (less than their cost). Still doesn't help with the fact that a 2013 truck has spent 40 of the 60 days Ive owned it in the shop. Oh well I guess I deserve it for buying a Paccar.
     
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  9. magoo68

    magoo68 Road Train Member

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    Hopefully they find issue because it's a pretty decent engine when running right.. Sounds like their chasing the symptoms not the real cause .. I had a 2009 dd15 which shops replaced 1000's of dollars worth of parts and problem was wiring in the end which I got fixed when I broke down near a shop I didn't use before.. Explained problems mechanic opened hood wiggled wires and engine stalled.. Some shops skip basic steps and only do what computer says is wrong with everything nowadays interlinked problems aren't always what computer shows it could be wiring, low fuel pressure , a dirty egr etc etc hopefully they are doing the basics good luck
     
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  10. Guntoter

    Guntoter Road Train Member

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    Got it out of the shop (again) Friday afternoon. Had more codes and "re-gen required" within an hour. I just spent $7,000 cleaning and replacing EVERYTHING in the after treatment system.
    If I have not made myself perfectly clear yet... DO NOT EVER BUY A PACCAR ENGINE !!!!! I have had every Paccar rep look at my printouts and they are all throwing up their hands (as they eventually do with most Paccar engines). Im on my own now with a truck that I owe $100K on and can't drive.
    I have owned this truck since June 25th, It has 4000 miles since then and 11 shop bills, I have owned the truck 65 days and it has been in a shop 50 of them. Try making a living with a Paccar... I dare you.
     
  11. Guntoter

    Guntoter Road Train Member

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    Its startling when you sit down and start adding up how much time and money can be spent in a shop. I have underestimated the total that I spent, I had assumed it was 10K... Nope its nearing 15K.
    In case anyone asks "why didn't you do a background check on it before buying it"? Good luck, Paccar guards their information like they're state secrets. They obviously don't want people to be able to see the tons of issues they are having so they do not give any information to anyone (even Peterbilt dealers).
    You may not like the information you get from Cummins when shopping for a used truck but at least you know what you are getting. Ask yourself why that Paccar has half the miles as a similar truck that has a Cummins. I should have asked that.
    **Rant Over (for now)**
     
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