If transmission has an issue would check engine light appear?
White smoke sometimes comes from tail
pipe. Speed isn't consistent. Sometimes I
hear roughness when trying to accelerate
Not really sure but sometimes white smoke indicates water damage or fuel not burning the right way.
Yes, the PCM (Powertrain Control Module) controls and monitors both the engine and transmission. A transmission problem can very well trigger the check engine light. Have the computer (PCM) scanned at your local auto parts store. Most will do it for free. Post the trouble codes here and we can help further. HTH. - Jim
Search Buick Park Avenue Questions
Buick Park Avenue Experts
Related Models For Sale