Having problems with your 2002 Pontiac Grand Prix ?
When shifting from second to thrid it has a skipping or bucking.drop transmission pan,no metal or shavings in pan
You should have the computer scanned at a transmission shop or a dealership. If you get a code P1811, that is the 'max adapt long shift' code. That means that the Electronic Pressure Control solenoid may be going bad. Normal wear and tear on the clutch material can also cause this code. Basically, it means that the transaxle is taking longer than 0.65 seconds to shift, and the computer commands maximum line pressure to avoid burning out the clutches. I have had good success with installing a shift kit on several of these transaxles (4T65e) to remedy this problem with no further issues. Visit www.transgo.com and look for distributors in your area. The shift kit you need is the SK 4T65e shift kit. The kit comes with very good instructions. It is not a difficult job. If you can drop the pan and change your own fluid, you can install this kit.
Clutch could be going bad have it checked by a transmission shop
Repair Help & Product Troubleshooting for 2002 Pontiac Grand Prix
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