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I apologize on the delay. I was told this was in the wrong category and just got moved to the right one.
Here is the information for the fault. I will say that you will want to take this to the dealer or to a shop that has the Detroit software to diagnose this further because if one of the regen switches are acting up (which is most likely the case here) ther truck will go into a limp mode and cause the accelerator pedal to not allow the truck to rev up properly. Removing the clutch sensor will bypass it until the truck sets the code for it and then you are back to square one.
In regards ***** ***** speedometer not working, that could be a separate issue. The concern is if the signal is making it to the SAM and then not going to the ICU or if the SAM isn't even getting the signal. This truck is highly computerized and needs a diagnostic computer to diagnose it properly.
I'm posting the fault code info below from the service manual.
Fault Code 523530/31
This fault becomes active when the
MSF Master does not sense one or
more switches on the sub bus that it
expects due to MSF parameter
Action: With the key ON, connect to the vehicle with ServiceLink. Go to the MSF "Switches" screen, and note which switches
are marked as missing. For each missing switch, determine whether or not the vehicle should have that switch installed. If it
should be installed, install the switch. If it should not be installed, set the appropriate MSF parameter (based on switch ID)
to make that switch "not available". If the switch is already installed, the fault indicates the MSF Master is not sensing the
switch on the sub bus. Check the connections between the switch, MSF slave and sub bus connections to the MSF master
The other one is an INFORMATION ONLY fault.
Remove the MSF master(Hazard Light, Red Triangle on the Dash), make sure there are not any connectors that have fallen out of the back.
The Sub bus switches are your Engine Brake, Fan manual, Regen Switches, these are the switches that are connected to the Sub Bus.
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