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.Google+
Car Problem Reports
Pontiac Montana Transmission Pressure Control Solenoid Failure May Cause Erratic Shifting
Pontiac Montana Problem
Average Mileage: 144,666 mi (88,000 mi - 176,000 mi)
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.
Visitor, 1999 Pontiac Montana
it whines and shifts very hard on 3rd and 4th gear.
Visitor, 2001 Pontiac Montana
shifs hard check engine lites off dont do it
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.
Visitor, 2000 Pontiac Montana, 176,000 mi
won't shift after van warms up