07.5 LMM No crank "service theft detterant system"

[Dallas S]

got this truck on a trade. supposed to have a dead piston as per the GM dealer. my understanding is the previous owner drove it to the dealer with 574 000 km on it complaining about a noise. dealer promptly sells him a new truck

I get the truck with the passanger side motor torn apart. just intake/grid heater, upper valve cover, 4 injectors, and a few glow plugs. before I tear this motor out I wanted to get it started and really see whats happening. put it all back together, go to start and everything works fine untill I go to crank it, i get nothing. everything in the truck works as it should. if I jump the crank relay with 12 volts it will turn over.

I do get a DIC saying to service the theft system. quick google search showed me that there was a TSB out for this, and of course my VIN falls in the know problem VIN's.

Can I just reflash a new OS or is this something only a tech 2 can deal with?

going to check the fuse box connections and the power block near the passanger side batt. just looking for opinions :thumb:

 

[coker6303]

EFI live can turn off the anti-theft. For some reason I have to disable it on all of my tunes for my truck to start

sent telepathically via rooted ThunderBOLT

 

[08txlmm]

There is a newer OS that will get rid of the VATS no start issue. I believe it is 8594. I got mine from GM through the recall a year or so ago before I had efi live. I have it on my computer if you need it.

 

[Dallas S]

left batts unhooked for a few hours, and now it cranks. havent gotten it to fire yet, hoping it just needs to prime the system.

But one piston is defenantly cracked. you can feel the compression fire out of the oil fill neck every crank.