Erratic Shifting of the Automatic Transmission on Pontiac Montana

The transmission pressure control solenoid may fail causing erratic shifting. Our technicians tell us that partial dis-assembly of the transmission is necessary to replace a failed pressure control solenoid.

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Average mileage: 144,226 (88,000–176,000)
8 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006
29 people reported this problem
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problem details
2001 Pontiac Montana 175,900 mi,
Goes into gear then will not switch gears... Starts rolling... Will not go at all when in any gear... Turn engine off, start it back up and it will go and might switch into 2nd and sometimes 3rd but then starts rolling again. Not fixed yet but I hope someone knows what to do.
It started jerking as it shifted gears. I took it to the dealership. They said their mechanic who fixed transmissions quit his job so they took it to a transmission shop far away from where I lived. They said they replaced the transmission. I got it back and it did the exact same thing with the new transmission.
2005 Pontiac Montana 89,000 mi,
Just happened today, compl;etely out of the blue. No warnings, just won't move in Drive or 3rd. slow rolls in 1 and 2nd. Taking it in to see what's going on, but 89k is way to young for a tranny rebuild.
THE TRANSMISSION THUMPS AND WHINES WHEN IT SHIFTS INTO GEAR, IT HAS DONE THIS A COUPLE TIMES A YR, FOR THE LAST 2 YRS. I PUT SEAFOAM IN AND IT HELPED, BUT NOW I THINK THE TOURQUE CONVERTER IS GOING OUT TOO. I HAVE OWNED THIS MONTANA FOR ALMOST 7 YRS. BEEN A GOOD CAR OTHERWISE.
2006 Pontiac Montana 162,500 mi,
Erratic jerking while driving
it whines and shifts very hard on 3rd and 4th gear.
2000 Pontiac Montana 176,000 mi,
won't shift after van warms up
It takes a long time to shift the first time but after it finally shifts the others do to but that first it shift I can only go about 20 miles.
2003 Pontiac Montana 156,000 mi,
patina el embraqgue al salir el motor levanta revolucion y no se seplaza cuando es una subida es peor.
shifs hard check engine lites off dont do it