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2010 Duramax no crank no start

9822 Views 19 Replies 3 Participants Last post by  duramax0323
Ok, I have a 2010 chevy buswith a6.6 duramx diesel. The problem happens out of nowhere. If you shut the bus off and leave come back to start it it wont crank at all. No codes are stored starter is new and everything checks out! Any ideas?? It starts after a while again then it happens again
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Batteries are good! It starts fine when it does start .
Hmmm thanks for th input ill try the dealer. This is driving me nuts!!
We have three of these durmax in the fleet and this one keeps acting up. The other 40one are 6.0 foes diesel and well we all know they suck!
So I pulled a code. U0168 LOST comm.with vehicle security module. Any ideas?
If anyone else can chime in it would greatly help!
No saftety switch on the bus! IM in Elizabeth NJ! Ive checked every fuse multiple times. It could go weeks fine then all of a sudden it starts doing it! Just Stumped
Were are you at?
If it is losing communication with the Vehicle security module then it could be the IGN switch, or just something throwing the program loopy. Check all the fuses with an ohm meter or test light when it does it again. You could be losing connectivity when it is warm. Does the bus have an alarm on it or possibly a saftey switch that will disable it?
Is there any common factors with the weather or anything? It sounds like you may just have a loose connection. I have no Idea where the security module on a bus Is. I would assume it would be in the relay center. I know the Duramax trucks security is part of the ECM programming.
Not really on the weather. Ive checked all grounds and everything. Ill look into the security module to see where its located. Thanks for some input!
Still having the same issue!! Seems to happen more in the warmer weather!!
Did you contact the dealer to have the security system re-flashed-? There was a TSB on it-- never did find it.

Did you have the batteries tested-?
No I didn't take it tO the dealer!! I've been trying to find the tsb but cant find it!! Batteries are good!
Yes one battery at a time! All cables disconnected
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