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 Bonneville Transmission Pressure Control Solenoid Failure May Cause Erratic Shifting
Pontiac Bonneville Problem
Average Mileage: 145,139 mi (83,000 mi - 255,536 mi)
Visitor, 2003 Pontiac Bonneville, 130,000 mi
My car does not shift into gear very well. Computer reading shows problems with solenoid. I actually have 2-Pontiac Bonneville's ('02 SSEI & '03) that are experiencing the same problem. The 2002 SSEI has worse shifting problems than the 2003, however, they are both experiencing similar shifting problems.
Nice cars but faulty shifting problems. I need to fix them....
Visitor, 1999 Pontiac Bonneville, 255,536 mi
when i drive it it shifts hard from takeing off from 1 to 3 and when it down shifts it trys to kill the moter whats wrong with my car ?
Visitor, 1999 Pontiac Bonneville, 150,000 mi
When warm from a standing stop the transmission will shudder under hard acceleration . Also up shifts become erratic and very harsh. Solution, Replace the pressure control solenoid.(If your not a decent wrench spinner take it to a shop)
Visitor, 2004 Pontiac Bonneville, 120,000 mi
Shifts hard when warm.
Visitor, 2003 Pontiac Bonneville
car acts if it is lunging or misfiring at various speeds , to test just litely touch brake and see if it goes away while lunging if it does its the control solenoid in tranny
Visitor, 2001 Pontiac Bonneville, 155,000 mi
after the car is driven for about 30 minutes, especially in warm weather, it will start to have hard up-shifts only.
Visitor, 2000 Pontiac Bonneville
wheels begin to vibrate when i speed up.