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Got a Cummins 600 in a Tiffin motor home that just threw a…

Got a Cummins 600...

Got a Cummins 600 in a Tiffin motor home that just threw a son 3251 fmi code. Want to know if it will serape if I keep driving it?

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2016 Tiffin allegro bus with 600 cummins

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

Only pulled the code this far

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Answered in 1 minute by:
11/28/2020
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
Nich1019
Nich1019, Cummins/Caterpillar Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,298
Experience: Expert
Verified
Hello and welcome to JustAnswer! I'm Nick and I'll be helping you out today. Give me a few moments to review your question and look up this fault code. I'll be right back with you.
Nich1019
Nich1019, Cummins/Caterpillar Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,298
Experience: Expert
Verified
Nich1019 and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Customer reply replied 2 years ago
Thanks
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
The 3251 fault codes have to do with the DPF differential pressure sensor. It could indicate an issue with the sensor, the wiring or with the DPF itself. Do you have the FMI number? 3251 is the SPN. The FMI will narrow it down a bit further.It is safe to continue driving. It's possible that damage can be done to the DPF. It's also possible that the DPF is already damaged. You won't do any harm to the engine or anything else though.Unfortunately the cause for this could be an oil consumption problem that is not easy to fix. Are you using oil? Do you happen to have extended warranty coverage?
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Customer reply replied 2 years ago
Fmi 10. Not using any oil.I am driving from Minnesota to Florida for the winter. Through the code in St. Louis. Wanted to make sure it wouldn't derate as I drove and continued our journey to Florida.I do have an extended warranty.
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
The FMI 10 is DPF differential pressure abnormal rate of change. It's more likely a sensor or wiring issue. It still could be a physical problem with the DPF though. And if the sensor is not reading properly it will cause DPF issues eventually.The engine will derate if this fault is active for an extended period of time.You could have the sensor replaced first to see if it will address the problem. This repair wouldn't take long.
I asked about the extended warranty because of the known oil consumption problem. If you're not using oil that's good. I would just get it checked out before your warranty is up. They have updated the piston rings and cylinder liners to address this issue.After writing all of this I just thought about the climate that you may be in. I'm in south Texas, so I don't always consider cold weather. But if its near 30 degrees or below, there could be ice in the DPF differential pressure tubes. After you drive for awhile it should melt though. This can definitely cause this fault code too.
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Customer reply replied 2 years ago
One more question… If it does Derate do you know what percentage it would derate ?
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
The fault code overview does not say what percentage derate there will be. With this type of fault code I wouldn't expect a substantial derate.
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Customer reply replied 2 years ago
Thank you Nick. I hope you are having a great Thanksgiving weekend!
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
No problem and same to you! Just let me know if you need anything else.
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Customer reply replied 2 years ago
55357;�
Customer reply replied 2 years ago
Hey Nick. Happy to report that the code is now gone after I shut off and refueled in Nashville. Thanks again for all your support!
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
Awesome! Was it cold this morning when the fault came up?
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Customer reply replied 2 years ago
28 degrees
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
Ok. I bet that's what it was. Something I rarely experience. I'm originally from Cleveland, but I've been in Texas for a long time now.
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Customer reply replied 2 years ago
55357;�
Technician: Nich1019, Cummins/Caterpillar Technician replied 2 years ago
Thanks for the update and bonus! Much appreciated.
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Customer reply replied 2 years ago
You're welcome
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