MPVI2 detect protocol failed on Gen 3 LS

Hey guys,

I have been having an issue with the mpvi2 connecting on my gen 3 pcm. I have tried various laptops and updated all drivers.

I have tried 2 gen 3 pcms and on all of those it says detect protocol failed, I have looked through all the forum posts with this issue and tried everything people have suggested.

When i connect to my gen 4 pcm it works just fine.

I have two different scan tools and have tried those on the gen 3 pcms and it reads the pcm and clears all codes.

Im at a loss, I have tested voltages and checked grounds.

any suggestions anyone has i am willing to try.

Thank you

Do any of the GEN 3 vehicles have aftermarket alarms or radio's?

I'm sorry you're having troubles and we'd love to help you. Have you already opened up a support ticket? If so, do you have your ticket number so that we can review the status? If not, please open a support ticket here: https://support.hptuners.com

Yes I opened a ticket, the number is 21118 I believe.

No all stock radios.

I have the same issue. I just opened a ticket with support. For me, all gen 3 ecus will not work with my MPVI2, but if I use my original MPVI Pro, it works fine.

same here i tried reading several gen 3 ecus and doesnt let me read all it says is detect protocol failed. then i read with my boss hptuners also a mpvi pro and his reads just fine. i dont know why this is happening it only lets me read gen 4 and up. i have drivers updated and everything up to date.

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Originally Posted by Lsx_covi

same here i tried reading several gen 3 ecus and doesnt let me read all it says is detect protocol failed. then i read with my boss hptuners also a mpvi pro and his reads just fine. i dont know why this is happening it only lets me read gen 4 and up. i have drivers updated and everything up to date.

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Sounds like the VPW chip in your device failed, not being able to comm with gen 3 but working fine on gen 4(CAN based) is a tell tale sign.