GMLAN dbc | AEM
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domlake
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GMLAN dbc

Hello all,

I have had good success with the OBDii scan getting me up and running quickly with my CD-7 but there are a few channels I'd like missing such as boost.

The OBDii appears to be on the same network as the GM LAN high speed (500kbit/s) so I was wondering if it would be possible to wire this to Can 1 (along with my VDM) and OBDii to Can 2? If so, does a dbc already exist for GMLAN?

Many thanks,

Dom

domlake
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Joined: 06/26/2020 - 05:09
Any help on this would be

Any help on this would be really appreciated. Assume a GM LAN dbc would be useful to many others also.

AEM_NS
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Joined: 06/06/2014 - 09:31
domlake wrote: does a dbc

domlake wrote:
does a dbc already exist for GMLAN?

None that we've ever seen.  It's an unpublished, proprietary CAN protocol.  I've reversed engineered some of it but only enough to make a Gen V Camaro happy running an Infinity ECU in place of the stock ECU.  That was more a matter of spoofing channels to keep the other CAN nodes happy, not figuring out the scaling of specific channels which were of no use to me.

domlake
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Thanks for your reply.

Thanks for your reply.

I found the below this morning - was this abandoned? If you could share what did it would be greatly appreciated. I know I will have to scale the channels etc but it would still save me a ton of work.

AEM_NS wrote:

There may be a silver lining to this cloud. Our testing has shown that both GM LAN and OBDII run on the same CAN network on GM cars. Right now you're sending OBDII into Port 2. What you'd need to do is tap into the same network and send it over to Port 1 on the dash in order to grab GM LAN.  We've reverse engineered a very large portion of the channels coming over GM LAN on a 2010 Camaro SS and can make a DBC that you can import to grab those channels.  I'll only include the channels that we fully identified and characterized but it'll give you a bunch more data to look at beyond just what's coming through on OBDII.  Give me a couple days to get that DBC put together.  

AEM_NS
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I have no GMLAN info for

I have no GMLAN info for manifold pressure. Sorry. Previously, someone wanted oil pressure I think so I was able to give that to them.

domlake
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Joined: 06/26/2020 - 05:09
OK, no worries. Do you have

OK, no worries. Do you have any info on the other channels you managed to reverse engineer? Manifold pressure was just one of a few missing channels I would like to capture. Thanks!

AEM_NS wrote:

We've reverse engineered a very large portion of the channels

 

domlake
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Joined: 06/26/2020 - 05:09
Very disappointed in the lack

Very disappointed in the lack of willingness to help. Starting to wish I had read these forums before purchase as I see a lot of threads recently going unanswered or simply receiving a sorry I can’t (I'm reading unwilling) help reply.

Real shame as I love your products.

I hope I'm not being unfair during the pandemic?

AEM_NS
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I have no additional useful

I have no additional useful data to share that isn't already a channel that you'd get over OBDII. Nothing's stopping you from getting a CAN sniffing tool and figuring it out on your own.

domlake
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Joined: 06/26/2020 - 05:09
I've already started with a

I've already started with a Teensy Triple CAN Board and SaavyCan. I will share my findings with others on here once complete as I'm sure there are many others with gmlan based cars\engines. I'm just disappointed that you won't share the 'very large portion of the channels'' you reversed engineered to save me some effort.