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 Grand Prix Transmission Pressure Control Solenoid Failure May Cause Erratic Shifting
Pontiac Grand Prix Problem
Average Mileage: 119,706 mi (47,000 mi - 182,456 mi)
Visitor, 2005 Pontiac Grand Prix, 47,000 mi
2005 Grand Prix started jerking before the gear would engage and now you put it in a gear and push on gas peddle and it won't go anywhere in any gear. If you are on a hill it will drift backwards. If you shut it off and wait a while and restart the car and put in gear it will engage but doesn't have much power. Could that be the transmission going bad!!
Visitor, 2001 Pontiac Grand Prix
Transmission whines and shifts hard after a while of driving
Visitor, 2001 Pontiac Grand Prix, 102,000 mi
Once the transmission gets warm, it revs engine and shifts hard through 1st, 2nd and 3rd gears. Once a speed of 45mph+ is reached the car is fine. Solution, replacing solenoid and having the valve checked out at as well.
Visitor, 2002 Pontiac Grand Prix, 121,500 mi
Code 1811 causes hard shifting; only when hot
Visitor, 2001 Pontiac Grand Prix, 125,000 mi
I'll be driving and it feels like a slip of the tranny, this is very spuratic.
Visitor, 2002 Pontiac Grand Prix, 137,000 mi
Car shifts hard from 1st, 2nd gear, stops once 40+ mph are reached. Can let the car sit for 2 to 4 hours and it will not shift hard again.
hard upshifting between 1st & 2nd & 3dr.trbl.code 742 torque conv.clutch circuit stuck on yesterday for 10 miles.mile.Car was bucking like a horse on shifting & felt like slippage.could be 1-2 shift or 2-3 shift solenoid.
Visitor, 2002 Pontiac Grand Prix, 85,000 mi
500 dollar fix, another common issue with this car.
Visitor, 2000 Pontiac Grand Prix, 104,000 mi
2000 GP Pontiac,
Transmissions shop says not worth fixing yet. Would be to costly.Some times hard shift some times smooth.
I will wait for transmission to go bad & then have them rebuild it.
Cars been hard shifting since 80,000 miles.
Visitor, 2001 Pontiac Grand Prix, 87,500 mi
Error code P1811