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 Aztek Transmission Pressure Control Solenoid Failure May Cause Erratic Shifting
Pontiac Aztek Problem
Drive Trains Affected: AWD, FWD
Average Mileage: 137,500 mi (132,000 mi - 146,000 mi)
Visitor, 2004 Pontiac Aztek, AWD, 138,000 mi
Shifts hard between 2nd and 3rd haven't gotten to fix it yet.