2002 VW TDI automatic transmission shift module on 2002 Volkswagen Jetta TDI

I just purchased a very clean 2002 TDI Jetta Wagon, w/automatic transmission. It has 148,000 mile. It runs fine, but seems to have a slight delay in the shifting sometimes. I was told this is a common 2002 only problem, and can be fixed by replacing the shift module (passenger side by firewall) with one for a 2003. Is this correct? Anyone know the correct p/n for the 2003 shift module. Can I buy an aftermarket one, where & what can I expect to pay for one?
Any help is appreciated.

Mike G., Chaska, MN

Try re-setting the transmission shift points by putting your foot to the floor and then turning on the key, this will se-set the shift points for your VW. Before you jump to thinking that it is a bad TCM , you better scan the data stream, there is a lot of info on how the Sensors in the Electronic Throttle Control wear and then cause delayed upshifts. Sound familiar? Best to have a savy tech Diagnose this issue first before you jump to ANY conclusions and start buying parts.
Once the shift points are reset, does the transmission then "learn", based on the driving being done over the next several days/weeks? I believe this was the case in a 2001 Saturn transmission that I had replaced some time ago... shifting was fairly hard & irregular for a short time, then fairly quickly smoothed out and ran fine.

Thanks for the advise. I have a friend that owns a large transmission shop. I haven't had a chance to speak to him about this, but I know he'll be happy to scan it for me.
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what do you mean putting your foot to the floor. question was with automatic transmission. so it can't be clutch. so.... brake pedal or gas pedal....?
standard transmissions do not have shift modules. They shift when you step on the clutch and manually change the gear with your hand