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Thread: truck wont start

  1. 01-25-2010 06:20 PM #1
    2000gmc
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    Unhappy 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)
    2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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  2. 01-25-2010 06:27 PM #2
    CHEVROLADE
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    check ecm fuse under hood/dash
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  3. 01-26-2010 03:33 PM #3
    2000gmc
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    day 2 still wont start

    Quote Originally Posted by STUNNA View Post
    check ecm fuse under hood/dash
    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.
    2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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  4. 01-26-2010 05:33 PM #4
    2000gmc
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    Unhappy ignition switch

    one of my buddys said it can be the ignition switch, does anyone know how to troubleshoot for a bad ignition switch.
    2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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  5. 01-26-2010 06:23 PM #5
    Madd Maxx
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    Quote Originally Posted by 2000gmc View Post
    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 . . .
    Hearing the fuel pump does not mean it's working properly. Put a pressure gauge on the fuel rail.
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  6. 01-26-2010 06:37 PM #6
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    farmtruc
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    Have vats turned off.
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  7. 01-28-2010 01:36 PM #7
    2000gmc
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    vats turned off

    Quote Originally Posted by farmtruc View Post
    Have vats turned off.
    what do you mean if i have vats turned off.
    2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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  8. 01-28-2010 01:38 PM #8
    2000gmc
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    Unhappy fuel pressure

    [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.
    2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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  9. 01-28-2010 02:15 PM #9
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    Chevy366
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    Quote Originally Posted by 2000gmc View Post
    what do you mean if i have vats turned off.
    V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?
    Now what is a tune again?

    Comp Cam 54-412-11 , Int:265, 212, .522 , Exh: 271, 218, .529 , LSA 114 , Longtube , CAI (Vararam) , TransGo HD2 shift kit , tuned by me with EFILive
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  10. 01-28-2010 03:11 PM #10
    2000gmc
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    Quote Originally Posted by Chevy366 View Post
    V.A.T.S. , vehicle anti-theft system , is it turned off in the tune ?
    no i think it says serial. on the space.if i put it on none will it turn it off.
    2000 gmc, 5.3, 220/224 comp cam,918 springs&harden push rods,long tubes,polish throttle body, 39lbs injectors,msd inline fuel pump,msd spark plug wires, 150shot, 3500 tci,servo,3.90w/eaton posi,m&h drag tires, tune by flaco,still need to re tune for fuel upgrade.
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