Clean engine start but then shuts off

Discussion in 'Odyssey' started by mickeyn77, Jan 23, 2026.

  1. mickeyn77

    mickeyn77 New Member

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    Location:
    Olney, MD
    Hi all,

    2016 Odyssey EX-L with 65k miles here.

    Went to start up the van and it starts fine but shuts down after 1-2 seconds.

    After it shuts off, the green key icon blinks (immobilizer) and "FCW system failure" flashes on the display. Pulled codes and got P1659 (ETCS relay?) and P2185 (engine coolant temp sensor 2 circuit high).

    Changed the battery b/c it was old and we just had a big temperature swing overnight, but no help. Used both key fobs with new batteries, and that's not it either.

    Any tips before I start changing random parts?
     
    mickeyn77, Jan 23, 2026
    #1
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