I have code P0335, crankshaft position sensor 'A' malfunction. What does this mean?

Bad crankshaft sensor or bad wire. Needs to be replaced or fixed.

Bad crankshaft sensor or bad wire. Needs to be replaced or fixed.
raplaced the sensor.........wow,, had to remove the starter to get to it. Still the same code now P0335. Car runs great, idle and accelerate unitl it shifts.Tjen the light comes on and it missed heavy during the shifts. However after it finally shifts it will run smooth at 55 mph. I am stupmed. Any help is appreciated. Thanks for the comeback.
Radarman

Could be a bad connection someplace. Did you use a GM crank sensor ?

yes I used GM, traced the wires as far as I could and they seem fine. The connector seemed very clean and good. I am stumped because I just started it, cleared the code and it ran great. I did not drive it however because I know what it does. It doesn't act up until it shifts under acceleration. ???

What year is this GA ?

Check the wires on the ECU/PCM.
As this code is a "circuit malfunction" not always does this mean the CPS was bad.

Also sometimes a relearn procedure must be done when replacing the CPS.