I get a check light for low transmission air when my truck loses the air in its system. I'm not sure if it's the same code that you're getting, but mine does not prevent me from starting the truck since it needs to start to build air pressure. Once it starts and gets about 60-70 PSI, the light goes away. If that's the only code, I would check the batteries, starter, and starting circuit.
Thanks My Man.
I’m not near the truck so have not tried it yet, but I have not thought about it. It most certainly is the case. The drivers read me the code so I jumped to conclusion that transmission is not switching to neutral and that’s why it is not cranking.
Thanks again.