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Thread: 4L80 F body PCM pin

  1. #1
    Potential Tuner
    Join Date
    Jun 2018
    Franklin NC

    4L80 F body PCM pin

    Looking for information on speed sensor use and pin out locations for 4L80 in F-body. Comparing same year(2002) Silverado PCM pin location. Looks like output sensor connector C2 pins 20 & 21. Input speed sensor connector C2 pins 22 & 23.

  2. #2
    Advanced Tuner
    Join Date
    Apr 2015
    304 has a ton of pinout diagrams.