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.
Car Problem Reports
Buick Regal Transmission Pressure Control Solenoid Failure May Cause Erratic Shifting
Buick Regal Problem
Average Mileage: 91,660 mi (71,000 mi - 125,000 mi)
Visitor, 2002 Buick Regal, 125,000 mi
the transmission shift erraticallt when in 3 and drive it feels like it is shifting in and out of overdrive cause he rpms go up about 750rpms and causes the car to surge when driving constant speed or going up hill over 30mph (out of second gear)
Visitor, 2001 Buick Regal, 71,000 mi
The transmission downshifts while driving steady(constant speed) this occures at 60 mph and at 30mph mostly, at least these two speed ranges are the most notable. The shifting is erratic and and does not occure frequently, maybe 2 or 5 times a month. One time at 60mph it shifted from overdrive down to second and the engine rpm jumped up to approx 4000rpm. The GM dealer and 3 garages have been no help.