I replaced the power/winter switch and transmision moduels and still have the same issue light comes on, I have to turn off and back on to reset then it is fine...Any ideas why?

 

Update for all: I check my Aldata files and there are a few ways this happens 1) if battery voltage drops below 10.50 volts there is a signal sent to the ECM which in turns generates a "Phantom code", and then puts transmission into "Limp" mode.
2) the power /winter switch...is bad
I replaced switch

I had battery and alternator checked with the equipment used at the local shops( they attached there equipment pressed a button), everything passed fine they said. I went home attached a simple volt meter and turn over engine ...voltage dropped to 10.5 volts....So I am thinking there is just a smaller battery installed. I have a 2 yr old battery with 550 cranking amps.... I will get a stronger battery and try again...any Ideas let me know