2002 Volvo XC70 AW55-50 to AW55-51 swap with TCM update

mechaman1 · Post by **mechaman1** » 21 Dec 2014, 15:51

I have 2002 XC70 with bad transmission. I changed oil. It was dark with shiny metal flakes seen on sunlight. The transmission shifts in manual mode between 2 and 4th gears.
I saw that 2003 and later transmission are less expensive and plentiful than 01-02 models. They will physically fit in my 02 XC. I know they have slightly different gear ratios 4.77/3.00/1.96/1.32/1.02 vs newer 4.66/3.03/1.98/1.34/1.02. I know if i install newer unit it may work but the TCM will detect incorrect gear ratio.
My question is: can I install TCM unit from 2004 Model? I've read that TCM is mated to VIN number. Will the transmission still shift on my car with 04 TCM and different VIN. How do you reassign VIN number?
On volvo parts site the TCM part number is the same for all years. If TCM swap is not possible can I load 2004 TCM software on my TCM unit in the car to reflect newer gear ratio with my VIDA DICE and three day subscription?

thank you for all answers

thank you for all answers

mechaman1 · Post by **mechaman1** » 21 Dec 2014, 19:16

I have also noticed that TCM reload software and upgrades on volvopartswebstore.com have the same part number for 2004 and 2002 XC70. So, would it be possible that 2004 software loaded into 02 XC TCM communicate with AW55-51 tranny swapped into 02 XC70? The AW55-51 tranny is more reliable and cost $400-500. Or could be the 02 XC70 TCM work fine with AW55-51
TCM RELOAD.
This genuine part fits your 2004 Volvo V70 XC.
Stock Code 9438291 ; 8645432; 8691289; 9494721
Manufacturer Volvo
Categories Engine > Ignition and control system; Transmission > Transmission

TCM RELOAD.
This genuine part fits your 2002 Volvo V70 XC 2.4l 5 cylinder Turbo.
Stock Code 9438291 ; 8645432; 8691289; 9494721
Manufacturer Volvo
Categories Engine > Ignition and control system; Transmission > Transmission

This is S60 2002 has different Software number, unlike above
TCM RELOAD.
Stock Code 30667211 ; 30667212; 30774461; 31219074
Manufacturer Volvo
Categories Transmission; Transmission > Transmission

Post by **jimmy57** » 21 Dec 2014, 21:43

TCM is not always universally swappable in the same comm structure but it is likely that the 2004 tcm will work.

The software p/n being the same doesn't mean the actual code delivered to be loaded will be the same. The order process uses the VIN of vehicle and assembles the package based on the vehicle attributes in Volvo database for the vehicle.