Transmission Code P0700 /P0976
so I'm a new member hello to all! I am a bit of an amateur mechanic, but I have stumbled on a problem on my reliable coolbalt. I've had the car for couple months now have driven over 10,000 miles on it and the light comes on and my code reader says transmission control system along with shift solenoid b low circuit, note I have sent to mechanic and they did nothing for a month saying I need a whole new computer an ecu they must have thought I was dumb. I know it was a tcm it might need but wasn't for sure, I unplugged my battery ask night, started car drives like it should again and as soon as the light comes up later it acts funny a nd drives to third max and won't shift to 4th.. it's strange when I clear the code it drives normal and light comes on again and acts up won't go into 4th gear, any suggestions if it might be my tcm? bcm fuse maybe? I already ordered a ac delco tcm fir 100 bucks 12,000 mile warranty
another man's junk is another man's treasure..