1630 is not a QDM fault...
Its system voltage high or low...
This will set when the PCM sees voltage above 17v or below 9v for more than 10 seconds while the engine is running
Book says when this code sets the trans will be forced to 3rd gear, TCC will not be allowed to engage... All to avoid erratic shifting due to inproper voltages..
Looks like you could have voltage problems, bad wire or bad PCM..
And didn't you have problems with this car the last time you owned it... And what was the correction?
QDM codes will be 1640,1650 and 1670
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