What was the solution? I have one that's coding the same error.

no problem lonnie_a

there is also a way to monitor the inputs and outputs through the dash display but that only tells you if a switch or a sensor is turning on or off, it does not show voltages or resistance on these circuits.

i only suggested calling a cat tech because unless you know these machines and their quirks you can spend alot of time trying to troubleshoot.

Thank you for your response much more involved than I anticipated. I will call in a cat tech. Once again I thank you for your time.

if you're unsure how to troubleshoot the systems on this truck i would suggest calling a cat tech to do it.
a manual would be required and also a laptop interface to monitor and adjust any signal errors, the problem might just be a setting out of wack or a faulty sensor or faulty signal from a sensor due to a bad connection.

Thank you for your reply. Serial# 5NR3337702. This truck continues to do the same. Every time after it sits for a period of time ( 30 min or longer) and you key up, the code comes up, but after you leave it on for a short period and re-key, it starts up and no code and is ok, as long as it isn't shut off again for a while. In this case, do you suggest to substitute logic, and if so what steps do I take to do this. Thank you.

serial number?
Alarm 41
Mod6 is steering control

MICRO SLAVE KO

Cause: The Master Microprocessor (MM) has detected a status
signal coming from the supervisor (SM) that doesn't agree with
the present command values. When MM is reading a command
value different from the one the SM is reading, this alarm will
occur. Remedy: If the alarm occurs permanently, it is necessary to substitute the logic.