truck wont start

when i turn on the key forward you can here the fuel pump come on, you turn it to start and it does for a second or so, and it dies again, it did that the other day and then it started to turn on and works great but today its doing the same thing that i wont turn on, so i connected the hp tuner and pulled this codes, hp tuners tech support said they were bcm codes and not to worry about it need some help. am not really worry about the brake codes but the others i don't know were start looking. thank you

[Brake] C0236 - Rear Wheel Speed Signal Circuit Missing (History)
[Brake] C0238 - Wheel Speed Mismatch (History)
[Brake] C0226 - LF Wheel Speed Signal Missing (History)
[Unknown] U1255 - Class 2 Communication Malfunction (History) (Immature)
[Unknown] B2947 - Security System Sensor Power CKT Low (History) (Current) (Immature)
[Unknown] B2958 - Security System Sensor Data Circuit High (History) (Immature)
[Restraints] U1096 - Loss of Communications with IPC (History) (Current) (Immature)
[Restraints] U1000 - Class 2 Communication Malfunction (History) (Immature)
[Restraints] U1064 - Loss of Communications with DIM (History) (Immature)

check ecm fuse under hood/dash

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Originally Posted by STUNNA

check ecm fuse under hood/dash

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i checked all the fuses, before this happen my security light would stay on while i drove it, could that have something to do with it.

one of my buddys said it can be the ignition switch, does anyone know how to troubleshoot for a bad ignition switch.

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Originally Posted by 2000gmc

when i turn on the key forward you can here the fuel pump come on, you turn it to start and it does for a second or so, and it dies again . . .

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Hearing the fuel pump does not mean it's working properly. Put a pressure gauge on the fuel rail.

Have vats turned off.

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Originally Posted by farmtruc

Have vats turned off.

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what do you mean if i have vats turned off.

[QUOTE=Madd Maxx;346467]Hearing the fuel pump does not mean it's working properly. Put a pressure gauge on the fuel rail.[/QUOTE

yes i have fuel pressure stock fuel pump plus msd booster pump.

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Originally Posted by 2000gmc

what do you mean if i have vats turned off.

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V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?

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Originally Posted by Chevy366

V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?

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no i think it says serial. on the space.if i put it on none will it turn it off.