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: 139,250 mi (88,000 mi - 176,000 mi)
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.
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, 2000 Pontiac Montana, 176,000 mi
won't shift after van warms up