I fixed it but typically it may have to be replaced if bad.
Pontiac montana sliding door problems.
The automatic sliding door alarm disable.
Then work both the lever and gas door back and forth until it the sliding door works right.
The contact owns a 2001 pontiac montana.
Work the gas door back and forth.
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.
Subsequently my van door passanger side came open slamming off half on the road and then remained attached to the top but the track wheel snapped off making it inpossible to put on with out tools and the muscles to even lift it.
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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.
Two problems power sliding door is initiating a fast.
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.
The power sliding door fuse will have to be removed for 1 min.
Open and close the power sliding doors twice with the overhead or b pillar switch to relearn the position.
The door comes unlatched from the pontiac montana mini vans w o power slider also.
The 1999 pontiac montana has 10 nhtsa complaints for the structure body door at 3 480 miles average.
The vehicle was taken to an independent.
The contact stated that the power sliding door would not latch when closing causing the door to open when driving.