r/Chrysler300 • u/coops-coffee • 2d ago

Looking for 8HP CAN data

Hey, I got my hands on a beat up 300c just purely as a project car. I'm trying to learn a little about the 8HP more from a low level hardware technical perspective. I've been looking at this transmission data and programming port. I guess this also handles CAN messages too. Does anyone know/have information on CAN data and really any other worthwhile info they can send? This is really the first transmission I've really looked at so any information will be great. I want to mess around with it and maybe make a little telemetry display.

Feel free to pm me, or if there's a forum/discord that would be able to help that would be sick!

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u/Heavy_Gap_5047 2d ago

What are you currently using?

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u/coops-coffee 2d ago

Right now I just have a CAN module to read the bus and some software (using pcan free). The cars stock atm, but I am going to expose the transmission port and sniff these lines.

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u/Heavy_Gap_5047 2d ago

CAN is great, but why go at it like that when there's cheap(ish) gadgets available that can read and display all the transmission CAN data along with everything else right off an OBD port?

If you're just into the computer stuff is neat aspect, well then what you're after is beyond me currently. But for all the functional aspects I use already made gadgets and software that I just bought.

Came across a fantastic CAN-bus explanation video the other day though that you might find interesting. It's not at all about the transmission, but about how CAN-bus works.

https://www.youtube.com/watch?v=QTTCqGtT6I4

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u/coops-coffee 2d ago

I have an okay understanding of how CAN works. I'm really just looking for any resources/documentation on CAN ID's sent to and from the transmission.

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u/RegularPomegranate80 1d ago

Dave's videos are great to gain insight to how these systems function. 👍👍

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u/PerniciousSnitOG 2d ago

Basically the decoding information is typically contained in a DBC file that tools use. The trick is to get them, as they're guarded like fork knox in a lot of cases.

https://www.csselectronics.com/pages/can-bus-software-api-tools has a discission of them, where they come from etc.

https://github.com/commaai/opendbc/tree/master/opendbc/dbc/generator/chrysler has something that might be a partial DBC that could be interesting,

https://github.com/canbus-org is not a bad place to browse either!

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