I have a 2002 Chevy Monte Carlo. It has started to upshift harshly recently, yet the down shifts are smooth. If I unplug the battery and let it sit over night, the next few times I drive it, it shifts just fine. Also when it starts shifting hard while I am driving I can pull the car over, shut it off, pump the gas pedal 5-6 times, restart it and it will shift just fine. I had the pressure control solenoid replaced when it was shifting hard through all of the gears 8 month ago and it was doing ok until recently. I also have had the transmission fluid replaced 3 times in the last 8 months.
RepairPal Certified shops can diagnose and repair your 2002 Chevrolet Monte Carlo. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
How long since your filter and fluid were last replaced? This is very important and if not done for 30k I would do so as a first step in the inspection of this problem. Any codes or Service Engine Soon Lights on?
Need to check those as well.
