The door will have to be relearned.
Pontiac montana sliding door problems.
Two problems power sliding door is initiating a fast warning chime.
The automatic sliding door alarm disable.
Then work both the lever and gas door back and forth until it the sliding door works right.
I fixed it but typically it may have to be replaced if bad.
The door comes unlatched from the pontiac montana mini vans w o power slider also.
Open and close the power sliding doors twice with the overhead or b pillar switch to relearn the position.
2 which sounds mainly your problem is the actuator that opens the latch snapped the plastic arm causing it to work as your saying only when you manually open the door.
The vehicle was taken to an independent.
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The cable needs to be lubricated and greased at both ends.
Also have a slower warning chime when in gear.
If the door reverses and or stops prior to completing the two cycles the procedure will need to be repeated.
Work the gas door back and forth.
The 1999 pontiac montana has 10 nhtsa complaints for the structure body door at 3 480 miles average.
The problem is usually the gas door end try wd40 with the red stick in the nozzle and spry were the cable connects to the gas door.
The contact owns a 2001 pontiac montana.
Two problems power sliding door is initiating a fast.
The contact stated that the power sliding door would not latch when closing causing the door to open when driving.