Both, the 99 & 2000 are OBD2, so any OBD2 code reader will read the codes. How well they will do is a different story.
There are code readers and scanners.
If you plan on doing your own work, scanners are the best way to go.
But, understand that most OBD2 scanners will not scan ABS or airbags.
Some scanners and code readers will only do generic codes, which doesn't include a lot of transmission trouble codes.
So be sure what you are getting if you purchase one.
Ask questions of the manufacturers.
Does it do enhanced parameters?
What are those parameters?
Things like that.
Most quality scan tool manufacturers will list the parameters that their scanners will do.
As for the shift problem, was the transmission fluid recently changed on the vehicle? If so, was the filter replaced?
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