Steve Clifford

Hello. When I am at lights, completely stopped the speedo goes all over the place, from zero to wherever. It seems to do this early in the morning when the car has been sitting overnight and everything is cold. When I drive off from the lights after a few minutes the green S light starts to flash then the engine light comes on. I finally got the error code flashes which was 4 long and 4 short which I think reads 44. When I looked up the code table there is no 44, the codes go from 43, misses 44 then 45. I'm sure I am reading the codes correctly. I am suspecting the ECU is faulty. Any ideas?