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Thread: GEn 3 ECM vs wiring harness

  1. #1
    Tuner
    Join Date
    Jan 2019
    Location
    North Carolina
    Posts
    61

    GEn 3 ECM vs wiring harness

    I bought a harness and ecm off of marketplace and were told they were off the same vehicle. The Harness had the Isolated ground O2 sensors with the SQUARE grey connectors. When i scanned the pcm and downloaded the tune it was for an 02 Silverado 2500 with a 6.0 which I though was case grounded. Is there a way to check that the PCM will read the sensors correctly?

  2. #2
    Advanced Tuner
    Join Date
    Oct 2013
    Posts
    550
    Starting in 2001 6.0L truck engines (LQ4 & LQ9) began using isolate ground front (upstream) oxygen sensors.