2003 Pontiac Bonneville
3.8
service engine soon
GM Computer codes = transmission solenoid

GM tech = jk
question = dont to much trust the code give me dont no a lot about cars
but my question to you my car lags from take off in regular drive and then
around 25mph will kick into gear in first gear it takes off fine what does it
sound like to you
Sounds like a misfire.
Could just be a bad spark plug, spark plug wire, or ignition coil.
3800 V6 are good for the rear plug wires to short and arc on the metal sleeve
over the plug end of the wire.
You can spray so water from a spray bottle on them when running to see if
you can cause the misfire.
Really need the trouble code you pulled from the computer to go further.