Electrical Issue (08 Gmc Sierra)

[700 sportsman]

Hey guys, so my dad had his 08 GMC Sierra tuned last weekend by Justin (Black Bear Performance), and it runs great.

 

Today on the way home he said the headlights went off interior lights, radio everything went black, and the engine seemed to cut power for just a second. And when he got home, he shut the door and all the lights went out.

But now everything seems to be ok, remote start works, lock/unlock, and I went for a drive flashing the lights turning them on and off about everything I can think of, and I got nothing.

 

Now I think it was the PCM resetting, because that sound like similar to when Justin tuned it and the PCM reset. Is there any logic to this? Why would it just take a notion to reset?

Also I used my code reader, and there were no codes shown, none appeared while driving, and there were no stored codes.

 

Any ideas or input would be greatly appreciated.

 

Thanks in advance

[LeoS41280]

Which dash does he have? There is a TB about a screw nicking a wire harness in the deluxe dash.

[700 sportsman]

Just the regular truck dash, it's an SLE

[nickvrebel]

double check the battery cables? that's just a stab in the dark, but can't hurt

[700 sportsman]

Well it happened again this morning except this time he said the locks cycled 3 or 4 times and the clock reset. Except this time there wasn't any power lost to the motor.

I'm not exactly sure what to do now