Pontiac Bonneville Problem Report

Pontiac Bonneville Erratic Shifting of the Automatic Transmission

(24 reports)

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.

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.... -
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) -
after the car is driven for about 30 minutes, especially in warm weather, it will start to have hard up-shifts only. -
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 ? -
Shifts hard when warm. -
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 -
wheels begin to vibrate when i speed up. -
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