2015 gmc deleted and tuned question

[Zacharrell21]

I have recently purchased my first duramax. Its a 2015 gmc denali 6.6 duramax. It has already been deleted and tuned. Everything on the truck checked out so i bought it but i still have no knowledge of the tunes it has. It has ez link on it and a 5 position switch. Is there a standard for what each setting 1-5 is for? For example is 1 always stock and 5 always max hp? Or could they be anything and how do i tell? Thanks

 

[Jacy_dzlguy]

They could be anything. Do you know who the tuner is?

 

[Zacharrell21]

No idea. I assume ill have to find somebody local to maybe hook up to it and maybe see what is what. I was just hoping there was another way.

 

[2004LB7]

The LMLs don't have the traditional DSP5 tunes the earlier models did. The DSP switch is actually tricking a sensor (fuel temp?) Into reducing fuel. How much fuel is pulled will be up to the tuner.

 

[NC-smokinlmm]

Call dealer and find out who owned the truck, then contact them. Do not tell GM what your doing or they will not give you info. Just ask for vin info saying you are car broker.