Locating transmission control module on 2009 Chevy impala

you did not specify what engine.
google 2009 chevy impala serpentine belt Diagram


copy and paste

https://www.justanswer.com/chevy/3ruw6-need-serpentine-belt-diagram-2006-chevy-3-5-lt.html

https://www.fixya.com/cars/t15630016-diagram_serpentine_belt_2009_impala_3_5l

Question edited for clarity.

Question moved to sub category.

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How to reset ECM TCM in 2012 Impala Chevy Impala Forums

Your vehicle has a PCM not TCM . PCM - powertrain control module . Has both the transmission an engine control inside one module. Where ever the engine computer is under the hood that's where the transmission control is .

Transmission Control Module (TCM)
Left side of the engine compartment in with the air cleaner

If the transmission is full of fluid. please go here to read the problems with the pressure control module--http://repairpal.com/transmission-pressure-control-solenoid-failure-may-cause-erratic-shifting-593, Hope this helps, chevy impala pcm may cause erratic shifting.

Run fault codes and look for a faulty OD sensor /servo in the transmission. Check the operation of the TCM (transmission control module)

Hello, the 2003 impala's dont have a transmission modulator valve. this transmission is electronic controlled by the power train control module. the transmission uses a pressure control sol. inside the transmission instead of a vac. operated modulator valve. if you are having a late harsh shifting problem, this would be more in the area of a pressure control sol. at fault

reprogram your transmission control module, and pcm update.

that has not been used since the 70's on cars without a computer controlling the transmission
if one was present the part would have a vacuum hose going to it on the outside of the transmissionl