Interchangeable parts for transmission computer?

Post by **abscate** » 17 Oct 2025, 13:19

Make sure its returnable for at least credit. We have had one T/ECU part failure on this entire forum, since I joined in 2013.

Post by **jimmy57** » 17 Oct 2025, 16:14

abscate wrote: ↑09 Oct 2025, 17:32 Are 1998 and 1999 TCUs the same? One runs Motronic 4.4 and a 99 runs ME7, pretty different …?

No. 1999 is the CAN intro year and TCU also gets security matching starting that year. No plug n play. 97 850 LPT and 98 LPT have interchangeable TCUs but 97 HPT are M4.3 with 98 HPT becoming M4.4. I remember a pin differs between those two and the 98 HPT will have a transmission error with 97 and down HPT TCU in it.

Post by **abscate** » 17 Oct 2025, 23:22

Thanks for bringing the Bible to the gathering, jimmy57

Interchangeable parts for transmission computer?

Re: Interchangeable parts for transmission computer?