Erratic Shifting of the Automatic Transmission on Pontiac Bonneville

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: 138,045 (16,000–255,536)
9 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004
25 people reported this problem
7 people shared problem details
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....
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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)
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after the car is driven for about 30 minutes, especially in warm weather, it will start to have hard up-shifts only.
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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 ?
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Shifts hard when warm.
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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
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wheels begin to vibrate when i speed up.
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