Security Unknown Message During Write

[Jim P]

Long story short, was pissing around tuning with HP Tuners on my 2012, was always leary of HP Tuners. Anyways, it bricked the ECM after a few months of using it, ordered a used one programmed to my VIN, loaded up a tune on the

[GMPX]

It might be a long story but your post was cut short....:nixweiss:

[Jim P]

Ah, what the hell lol.

[Jim P]

I loaded a tune to the “new” ECM with EFILive, didn’t apply the RSA patch first. It gave a security “unknown” message after sending an unlock key, then after the message send an unlock key again and wrote the tune. That normal?

[Jim P]

It takes writes and the truck runs fine other than some gremlins after the bricking of the original ECM from HP Tuners. When I turn the ignition to on, the exterior lights and instrument cluster illumination flashes twice. Other than that, everything is normal in operation of the truck.

[GMPX]

If the ECM hasn't had the anti-tuning stuff turned off then it will still take a stock tune no problem.
Are you sure you started with the correct base calibration? (It will be written on the sticker on the 'dead' ECM).

[Jim P]

Yessir, CM90032. Wasn’t a pure stock file that I loaded to the “new” ECM though either, truck won’t run right or very well without some particular modifications in the tune file.