Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 11, 2025 ...

Another check engine light

June 03, 2022, 12:04:16 pm

Last April after repairs at FOT and after refueling in Nacogdoches, a yellow check engine light came on (a hour north of Nac). I pulled over, visually checked the engine compartment, then restarted the engine. No light and no problems the final 500 miles to home. My PC based Silverleaf diagnostic history file shows this:

SRC TPE  ID MD COMPONENT                      MODE            MM/DD/YY HH:MM
=============================================================================
ENG SID  251 50 Power Supply                  Invalid Data      4/15/22  8:57


I can not locate the # 251 fault code here: ISC Fault Codes List- Cummins ECM

I tried quickservice.cummins.com weeks ago, but it did not recognize my engine serial number. Now the site does not even recognize my password or user id.

Does "Power supply" means battery or loose connection? Others searches involve a "real time clock -power interupt'

Thanks

Bob
350 ISC
 

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Re: Another check engine light

Reply #1 – June 03, 2022, 01:25:25 pm

I have the same issues going on, whole string of engine codes that don't make sense. Bad program, sensors not responding, incorrect data, incorrect engine speed data. Silverleaf doesn't give you enough information on the codes. Each sensor can have 5-6 codes associated with it. Got the mobile engine guy coming out Monday to see what's up. Hopefully not but I'm betting on an engine processor ( computer) $$$$. Oh and the coach is running great.

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Re: Another check engine light

Reply #2 – June 03, 2022, 01:46:59 pm

OK, I found a fellow with a SID 251 that made a video about his experience. Sounds as if the Volvo/Cummins dealer is not the one to go to. The ECM turned out to be the problem. This guy is not happy with the first shop. Here is the video:

https://www.youtube.com/watch?v=92XaKtf5SWg

Pierce

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