BCM tune for speed limiter removal on GMC trucks

American Delco GM ECUs and PCMs, ALDL, OBD 1.5.
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Joined: Tue Oct 27, 2020 7:00 am

BCM tune for speed limiter removal on GMC trucks

Postby hidalga » Wed Jul 13, 2022 4:24 am

Is there any way to tune a BCM from the latest versions of GMC trucks to free the speed limiter? If so, any idea how I could start?

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Joined: Fri Feb 24, 2017 11:27 am

Re: BCM tune for speed limiter removal on GMC trucks

Postby gmtech825 » Wed Jul 13, 2022 9:35 pm

latest version as in 2023 MY?

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Joined: Tue Oct 27, 2020 7:00 am

Re: BCM tune for speed limiter removal on GMC trucks

Postby hidalga » Thu Jul 14, 2022 3:05 am

Yes, any 2019+ GM BCM, I'm aware that there's a way to read the bin file, but I don't know if there's a checksum, seed/key algo, where should I look at so I can free the speed limiter

Posts: 140
Joined: Fri Feb 24, 2017 11:27 am

Re: BCM tune for speed limiter removal on GMC trucks

Postby gmtech825 » Mon Jul 18, 2022 10:22 pm

seed/key algo is 5 byte 0x24. checksums are the first two bytes of the segment calculated by 16 bit big endian NOT of the whole segement excluding the first two bytes.

this only applies to the non global B vehicles I've looked at.

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