I have an 08 gmc duramax with a no crank condition. the ecm update was done a few months ago. no codes have been thrown. it has done it 3 times in the last week. had it hauled in from the house once to my local dealer, and hauled in twice to a different dealer here in Ingleside, Tx where i am working for the next few weeks. neither place seems to know what is wrong with it. it just wont crank over, then if you go try to start it later whether it be 5 mins or 12 hours later it will crank over and start. any suggestions?

That's a crew cab in your sig.

Take it to a different dealer, one with a decent tech.

its already been to two different ones, not a lot to choose from when it doesnt run.

bump

Ignition switch?

i dont think its the switch, you can here something connect under the hood, one click, im thinking its something to do with the security system on this pos.

bad ecm would be my guess

they had mentioned a possible ecm replacement. i think i need a total replacement or money back, lol. i hate spending hard earned money on something that leave you stranded when you need it the most.

they had mentioned a possible ecm replacement. i think i need a total replacement or money back, lol. i hate spending hard earned money on something that leave you stranded when you need it the most.

count yourself lucky. my 08 did it to me 8 times in 2 weeks. finally traded it off. i had an edge chip and the first time they disconnected it and it fired right up. that's because it was a couple hours since it was towed in. I had the dpf delete and edge (for the monitor) and quadzilla chip in it. i didn't want to push to hard in case they got a gm rep inolved and tell me to pound sand because I had all this aftermarket goods on it. dealer was happy to trade it in. the new buyer of the truck apparently has brought it in once the same day he picked it up for the same issue. good luck with it.

i have already started the La. lemon law suit and talked to a lawyer. he told me i had a legitimate claim. the truck is totally stock so they cant say to much. i just dont trust the truck anymore. btw nice looking rig trx-1noob.

I had this problem. After all the headaches, the problem was traced to a bad battery of all things. A tech told me to try boosting the truck and it fired up, changed the battery and it hasn't happened since. Maybe I was just lucky?

A different tech had mentioned a possible problem with the security module, he told me to try disconnecting both batteries, wait 5 minutes and reconnect, this didn't work for me but it may help?

hmmm, i was thinking it may have something to do with the security system on it. im just waiting for it to do it again so i can add it to the number of times it has been to the shop for the same problem. ill give it batteries a try if im stranded somewhere, thanks for the tip.

I had an 07.5 GMC that did the same thing intermittent non start
started at the end of Jan.
they tried 3 sets of batteries , alternater,starter ,key switch ,
reprogramed the ecm about 15 times , and a new ecm
from mar17 - may 4th I had the truck about 6 days
when it goes into the non crank mode all it did klick-klick
and if you watch the belts they move about 2" every time it klicks
and it made no diff. if I tryed jumper cables or a battery charger
GM finally bought it back and got my 09 chev on the 4th of may.
Talked to the dealer yesterday and they are still working on it.
GM wants them to try and get it fixed so they can run it thru a GM buyback auction .
But it is still doing the same thing it starts when it wants to
GM tech now wants them to put in new fuse panels

I had an 07.5 GMC that did the same thing intermittent non start
started at the end of Jan.
they tried 3 sets of batteries , alternater,starter ,key switch ,
reprogramed the ecm about 15 times , and a new ecm
from mar17 - may 4th I had the truck about 6 days
when it goes into the non crank mode all it did klick-klick
and if you watch the belts they move about 2" every time it klicks
and it made no diff. if I tryed jumper cables or a battery charger
GM finally bought it back and got my 09 chev on the 4th of may.
Talked to the dealer yesterday and they are still working on it.
GM wants them to try and get it fixed so they can run it thru a GM buyback auction .
But it is still doing the same thing it starts when it wants to
GM tech now wants them to put in new fuse panels

lol, well this one wont even crank over. just clicks once and nothing after that.

well it has almost made it a week without screwing up, sure is getting crappy fuel milage since i got it back. 12.3. I dont understand. before the updated ecm i was getting around 18 on the highway. i guess since everyone was complaining about the crappy fuel milage gm decided to turn down the pressure on the pump to try and get better milage out of it. since the flash my power is down and mpg is worse. injectors may be a little plugged up and without the extra pressure they arent spraying right??

well it has almost made it a week without screwing up, sure is getting crappy fuel milage since i got it back. 12.3. I dont understand. before the updated ecm i was getting around 18 on the highway. i guess since everyone was complaining about the crappy fuel milage gm decided to turn down the pressure on the pump to try and get better milage out of it. since the flash my power is down and mpg is worse. injectors may be a little plugged up and without the extra pressure they arent spraying right??

lower presure would net lower mpg not higher. how do you know the rail presure is lower ?

thats what i said, i have no hard proof that they actually turned it down, but like i said after the flash it has been getting worse milage, if i have less pressure with dirty injectors the spray pattern/ atomization will be poor verses higher pressure being able to atomize the fuel out of the dirty injector better than low pressure. more pressure during a duration of time equals more fuel. less pressure during a duration of time equals less fuel. less fuel equals less spool, which equals less power. less fuel, less boost, less power. right?

could be a bad load of fuel, i filled up on murphy fuel because it was 1.99 gal. i filled up with Esso today that was 2.36 gal. seems to be running better after driving just a few miles. Im going to load it up with slick diesel on the trip home and see if it will help clean it up some. I will get to burn two tanks on the way back to la so maybe it will clear up.

well its sunday and its still running, getting better milage too with the slick diesel in it. got 120 miles on a quarter tank.