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  1. #1

    Default TO405 trouble code. egr already replaced TWICE! HELP!!

    I have a 1998 Tahoe V-8 Vortec, button control w/auto4x4, auto, FULLY loaded 189,000 miles
    everything about it is wonderful EXCEPT my check engine light is on and code TO405 is all that comes up on the scanner. I have replaced the EGR twice but does not help. if you have any ideas/suggestions please let me know I will try ANYTHING!!!!Click image for larger version. 

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  2. #2
    Sr. Apprentice
    Join Date
    Nov 2008
    Endicott, NY


    Did you follow the proper diagnostic procedure or did you just replace the EGR valve? The code only tells you where to look it doesn't tell you what part has failed. You have to follow the procedure to find the failing component. The attachments cover the diagnostic procedure including a schematic to be used.

    98 Tahoe DTC P0405 Exhaust Gas Recirculation P1.doc
    98 Tahoe DTC P0405 Exhaust Gas Recirculation P2.doc


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