2002 Buick Rendezvous - Transmission

trans wont shift passed second gear. replaced with a new one, still doing the same thing. i need a diagram to test the plug and harness

You put in a used trans?
None would put in a new trans on a 2002 rendezvous,
Take it to trans shop, their scan tool will confirm if it is a wiring issue.

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Rather than paying for a diagnosis ?

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