Rich, I have no codes in the ECM other than this which I debated on the Silverleaf forum:-
Relays can act up, but if the problem is time related, you mentioned needing to drive 20 miles or so makes it highly unlikely.
Many of the relays used in the buss electrical box are the same number, you might try to switch 2 of them around.
The fact that the problem comes and goes, is related to driving time, sounds to me like a intermittent component or a cold solder connection. There are other electrical components that can become temperature sensitive also.
There could be a code set in the ECM, but some of them are low level codes meaning the problem the code represent a low level problem and does not directly involve engine performance.
You could have the ECM run on scanner to see if there are any codes stored.
Question-Its a little off form your issue, but are there any other intermittent issues, like strange gauge readings accruing at all no mater how unrelated they might appear.
Hope the weather has not been as bad lately, in the country of some of my four fathers.
Cummins Technicians are often only able to locate the
Cummins Engine Codes, not the SAE Engine Codes which their ECM also generates.
SAE Codes are the Codes that the SilverLeaf Products read...
Conferring with Cummins "Experts", the SAE Code
"251-2-1" is Cummins Code:
319 - Maintenance : Real Time Clock Power Interrupt
- Data Erratic, Intermittent, or Incorrect.
I understand this is a transient code, but could it be an issue with my engine brake?
The only strange issue is that I have on 2 occassions had my HWH LCD screen go off, (I have the full active air system with large disply) the system is still working but I have to do a HWH reset to get it back up.
I have 2 new relays in the mail to me (exact same ones) so I will wait for them to arrive and do a test. This relay is labeled in the bussman box as "Engine Brake Load Relay" I have tested it and it does seem fine, but I do not know about in use as I have only just found this relay and have not been out for a spin to get a failure then pull it and read it.
So if any of this ramble gives a clue I look forward to hearing.
By the way, if it were an ECM problem would it be reasonable to say that there would be a fault code specific to the engine brake? And its absence suggests an OEM issue?