Security light

[JDPlowboy]

Any fix for security light coming on? Seems like every 01/02 I flash that fails will set the security light. I've tried updating vin and re linking vats.

[GMC-2002-Dmax]

Post the stock tune read out with the security issue.

I bet the BCC is corrupted

[JDPlowboy]

Well it was tuned previously, but what read out do you need to see?

[JDPlowboy]

I read the tune, and like you said. BCC had all question marks. Currently reflashing after updating with correct code

[GMC-2002-Dmax]

Most likely the ecm is corrupted, the security light will not go out until the BCC shows correct.

If you use that tune and flash any other ecm with it the ecm will also be corrupted.

LB7's need the flash chip pulled and off board programmed to repair them, SoCal Diesel has a repair service.

It will most likely run but that junk BCC is causing the security light.

[JDPlowboy]

Ok, thanks for your help