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Thread: B1000 and U1500....

  1. #1
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    Default B1000 and U1500....

    Anyone ever see these codes before? My nelson harness fried and i got these DTC's on the pcm. Now my signal from 42blue and 33red have a constant ground. The fans turn on as soon as the key is on instead of waiting for on temps

  2. #2
    Joe (Moderator) joecar's Avatar
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    Those indicate that there is a loss of communication with other modules on the serial bus.

  3. #3
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    Any idea how to fix it? Or do you know of a wiring diagram i can look for that will give me an idea. I just know its going to have something to do with HVAC control because my 42blue and 33 red on my 01 silvy are constantly grounded when the key is on...

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