dexron 3
It's in the transmission.
The transmission dipstick tube
You could try changing the transmission filter and the fluid.
Dextron III any brand.
Where do you add power steering fluid on a 2003 Pontiac Bonneville?
It is on the left side of the engine back by the firewall.
Any DEXRON-III synthetic transmission fluid. Some brands seem to work better than others.
Automatic Transmission, 4T60E,-65E Initial Fill...7.4 qtsAutomatic Transmission, Total Fill 13.0 qts
Its the transmission dip stick tube is how you add transmission fluid.
I had this problem with my 1994 Bonneville SE. would try checking the transmission fluid level(that was the problem with mine). If the transmission fluid level is where it's supposed to be then it could be that the transmission is going out or you may need to check the torque converter. I think that can also cause the problem.
Originally it was type A fluid. Dexron will be the replacement fluid.
1.8 qts