Erratic Shifting of the Automatic Transmission on Buick Riviera

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: 148,687 (112,000–190,000)
3 model years affected: 1997, 1998, 1999
11 people reported this problem
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Viewing 1 - 2 of 2 problem details
1998 Buick Riviera 112,000 mi,
Sometimes it shifts like it has a shift kit in it and other times its super smooth.
1998 Buick Riviera 146,500 mi,
First drive is fine once stopped then restart continue drive mostly at one speed 45 mph it will hard shift itself then continue jerk shifting approx 10 times in a 3 mile span not repaired