Request: CAN frame capture

67726567 · Post by **67726567** » 09 Feb 2026, 19:50

Hello,

I am a long time lurker on this forum. I'm reaching out in hopes that someone here may be able to perform a CAN capture of their P2 XC90 for me to analyze.

Here is the story:

I have a 2013 XC90 that was shipped from Volvo with a B6304S and a TF80-SC.

I have installed a B6304T4 from a 2013 S60 into the car along with the XC's original TF80.

I have the engine where it will start and idle using aftermarket engine management.

I need the CAN dump from an operable XC90 in my original configuration so that I can determine the frames required by the TCM so that I can hopefully drive the vehicle sooner than later.

Please respond if you are able and willing to help with this request.

Thank you in advance.

dikidera · Post by **dikidera** » 10 Feb 2026, 11:46

What seems to be the trouble specifically? Which function isnt working?

67726567 · Post by **67726567** » 10 Feb 2026, 11:52

The transmission is not going to work after I removed the Denso ECM and installed a EcuMasters EMU PRO to run a B6304T4 from a 2013 S60.

67726567 · Post by **67726567** » 10 Feb 2026, 11:55

The TCM relies on CAN frames sent from the ECM to choose the correct shifting strategy.

Fames that I know it needs:
- Brake switch status
- Engine oil temperature
- Throttle position

I'm sure that there are more.

But I either get a CAN dump from an operable vehicle or I have to figure out how to ROM dump the TCM.

Or, replace the TCM with a standalone but I'd rather not do that unless I have to.

dikidera · Post by **dikidera** » 10 Feb 2026, 12:31

There are many more. Cruise Control status, Engine RPM, most importantly, torque control/torque reduction, without a reply from the ECM with the changed torque it will likely go into limp mode(not confirmed tho).
It also reads Vehicle Speed from ABS over CAN.

67726567 · Post by **67726567** » 10 Feb 2026, 12:33

Okay, well that's why I've asked for a CAN frame capture from someone willing and able to obtain it

67726567 · Post by **67726567** » 10 Feb 2026, 12:59

FYI, the EcuMasters EMU PRO can build CAN frames. I have it connected to the Volvo high speed CAN and I also have a P-Can that I can do my own captures with but never did that (very unfortunately) before I began swapping the engines because I had a fundamental misunderstanding of the difference in the files loaded on each ECM.

They were both Denso MB279700-9500s.

However, when I got the flash pulled with a K-Tag on the bench, I realized that the instruction flash was different as well.

Call it naivete, but I had hoped that the security routine was in the bootloader. I do not believe that's the case. And due to the fundamentally different types of security systems on a P2 XC90 and a P3 S60, I decided to replace the ECM and just ignore the immobilizer that way.

67726567 · Post by **67726567** » 21 Feb 2026, 13:20

Well, I managed to drive it anyway. Not very far and there is a HARD shift to drive (RPM too high, brake pedal status not sent, IDK???)

Anyway, here it is:

67726567 · Post by **67726567** » 15 Apr 2026, 08:11

The reason for the hard shift from park to reverse is like dikidera has stated.

The torque reduction negotiation between the ECM and TCM needs to be sorted. I am working on that now.

67726567 · Post by **67726567** » 30 Aug 2026, 13:34

I have made progress.

The DBC file that I'm working on is here:

https://github.com/gregoryables/Volvo.P2.XC90.CAN_RE

I may add CAN logs later but for now, just the DBC.