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Thread: Bootloader rejected

  1. #1
    Lifetime Member limited cv8r's Avatar
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    Default Bootloader rejected

    Having trouble flashing and reading PCM in a commodore. Keep getting a bootloader rejected or no response from PCM with V7 & V8. Scan tool will connect and work, HP Tuner will read from PCM, any suggestions. Could a bad USB connection cause this?
    It's all good until it goes "Bang"

  2. #2
    Joe (Moderator) joecar's Avatar
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    Which PCM...?

    Which V7/V8 build versions...?

  3. #3
    Lifetime Member limited cv8r's Avatar
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    Gen iii , ls1b. Originally tried with whatever version was installed. Updated to RC3 and latest firmware. Still the same.
    It's all good until it goes "Bang"

  4. #4
    Lifetime Member limited cv8r's Avatar
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    Small update on this. Ended up using Roadrunner to tune vehicle. Could bench flash PCM no problem and eventually worked out could read and write to PCM with high speed unchecked. Maybe just a problem vehicle, something to remember for the future.
    It's all good until it goes "Bang"

  5. #5
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    Is this a 1MB LS1b PCM? I have all kinds of issues with those in the trucks. I basically get one shot and if I fail, take a 5 minute spin shut down and try again. Repeat as necessary. Really sucks when you have to burn the license and then tune. It took a while to come up with that. Another way is there's a data fuse under the hood you can pull, but a drive around the block seems to work best for me. It's the bus that pisses it off so bad, or rather everything on it.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  6. #6
    Lifetime Member limited cv8r's Avatar
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    512mb PCM , never really had this much trouble before. At least its done and out of my hair now
    It's all good until it goes "Bang"

  7. #7
    Lifetime Member GMPX's Avatar
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    Rarely hear of comms issues on LS1 cars these days, must have been something with the car itself.
    I no longer monitor the forum, please either post your question or create a support ticket.

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