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Have 2005 saturn vue 2.2 ecotec,engine code D.Has p0502,U0101.Checked AC voltage from output speed sensor to tcm,@1 to 5 volts ac. Can't find signal out wire from tcm. TCM has power,ground.Can a tcm be reflashed if its bad. Vehicles speedometer not working and transmission won't shift out of 2nd up or down. Where would i take it to get it reflashed? Thanx.
Vehicle: 2005 saturn vue 2.2 ecotec ,engine code D

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P0502 VSS circuit low voltage

Circuit low code if the sensor is not shorted or its signal is not grounded, then the TCM is suspected  . Before yopu measure you reference voltage you need to disconnect the input speed sensor it share the 5 volt reference.

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