Unknown code

I have received a code that doesn't show up on my list and Cummins can't tell me what it is either. I have a 2012 Tiffin Allegro Bus with an ISL 450. The code is SPN 09951-31

re: SPN 09951-31

Hello Travis

This code belongs to the Squarell technologies group which supplies measurement and telematics to various OEMs--to include Cummins and notably your ISL engine. In a nut shell, they make specialty sensors which then make data available on the CAN bus to then be used by the ECM and others.

One example is a unit to take the analog fuel tank level measurement, digitize it and pull it to the engines' ECU ...or...VMSpc or other VMS unit via the J1939 CAN bus. We never really talk much about _how_ that information gets created. Yet, this may be an example of a code relating specifically to that process.

You can see it here in this document:

There you'll see the call-out for SPN 9951. Its a specialty code only used by Squarell.

Here they describe general applications for Cummins and drop some model names:

And here they spec out *exactly* which data their sensors are collecting on your ISL engine via their Vehicle Support Matrix:


These items include:
Total Fuel Used
Total Engine Hours
Engine Speed
Actual Fuel Used
Actual Engine Torque
Engine Temperature
Turbo Pressure

So, What does SPN 09951-31 mean? Dunno. 31 is surely the fmi--the very specific failure.

[fmi 31 is used to describe many wrong conditions, too many to list]

But which sensor responsible for this is not obvious. Was there a plain text message with this error?

Is your chassis presenting any other symptoms or signs?


SPN 09951-31

There wasn't any text with the code. This code kept being re-thrown with high jake braking. And only came on a few hours after the first 2 were thrown. I took the coach for an 8 mile drive last night with zero issues. Did I mention I hate electrical gremlins?

Does Squarell have software available that will interpret the code? I was looking at the links and it wasn't really apparent. I have a trip coming in a few weeks, so I guess I can wait it out till then to see if anything additional happens. Thanks

re: Squarell tools

Yes, it seems they have a hardware tool which can run on Windows. Their home page may give some links for that. I did see many references to the tool on many of the pages and the various blogs discussing their equipment.

Their specific tool would be necessary to parse the J1939 data to their needs.