Unable to detect vehicle diagnostic protocol. 0411 PCM with Real time Road Runner.

Hi everyone, i`ve got a HP tuner MPVI std version diag tool, Hptuner suit installed and all drivers, no errors what so ever in the device manager.

When i try to establish connection with vehicle, i get a notice that the scanner is "Unable to detect vehicle diagnostic protocol", my PCM has a build in Real Time Road Runner from moates, i don`t know may be that can be a reason, but ELM327 and Tech II diagnostic scanners connect and recognize the protocols with no problems.

Any ideas why this may happen?

Ow, ok, i did some research, and found that some guys got it solved securing the EBCM connector, well i dont have the EBCM connected, and basically don`t want to have it connected, since mine is only rear wheels abs (old one), and i have to repin the connectors since my wiring is from a 1998 vehicle but the abs is from 1990.

Does that mean that i will not be able to scan my PCM/VCM with the HP scanner? Is it a must to have the EBCM connected using HP tunner?

No one can confirm that hptuner is not capable of connecting to the PCM/VCM and detecting vehicle diagnostic protocol with EBCM disconnected from the wiring???

I don't see any reason why it shouldn't but who knows they could've locked us out. I would suggest trying on a similar NON modified ecm to rule out a hardware issue of some sort on our end.

Right, thank you for the answer Bill, didn`t think of that, tried other vehicle, connects no problem...
Will check it on other gm, and will try with EBCM connector plugged and unplugged.

Quote:

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Originally Posted by Aksl

Right, thank you for the answer Bill, didn`t think of that, tried other vehicle, connects no problem...
Will check it on other gm, and will try with EBCM connector plugged and unplugged.

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Hi Aksl, Any luck on this one? Is it the EBCM? I got the same error and mine is unplugged.