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Thread: LT4 and 8L90 codes

  1. #1
    Potential Tuner
    Join Date
    Jul 2015
    Posts
    1

    LT4 and 8L90 codes

    I need some help with where I need to start with these codes. I bought this Create engine, and then I bought the 8L90 to go behind it. The harness is a Speartech with their ECM and TCM.

    Codes:
    LT4 Codes.jpg
    Attached Files Attached Files

  2. #2
    Senior Tuner
    Join Date
    Nov 2017
    Posts
    1,459
    You want get much help for that in this section. You really want the gen 5 (maybe). From the little info given, my guess is a wiring problem.

  3. #3
    Advanced Tuner
    Join Date
    Aug 2023
    Location
    SoCal
    Posts
    442
    Some sort of wiring issue, the transmsision codes are all for electrical circuit errors. Got a break the multimeter to find where the problem is at.
    Robert Moreau
    Technical Sales and Marketing Support Specialist
    TransGo
    2621 Merced Avenue El Monte, CA 91733 USA
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    https://transgo.com/our-products/