DTC P1645 EVAP Solenoid Output Circuit
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Cadillac Seville / Cadillac Eldorado Forum Discussion, DTC P1645 EVAP Solenoid Output Circuit in Past Cadillac Vehicle Discussion; I keep getting code P1645. I'm not sure I understand this one. Is this usually a simple fix? Thanks...
  1. #1
    ROCKnROLL's Avatar
    ROCKnROLL is offline Cadillac Owners Member
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    DTC P1645 EVAP Solenoid Output Circuit

    I keep getting code P1645.
    I'm not sure I understand this one.
    Is this usually a simple fix?
    Thanks

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  3. #2
    Mike G is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit

    Refers to evaporative emission controls. Could be the vacuum purge switch or the EVAP control solenoid. Check the ECS fuse in the engine compartment block or the fuses on the main panel. The solenoids are mounted on the top side of the motor so if they need replacing, it should be doable.

    --Mike

  4. #3
    ROCKnROLL's Avatar
    ROCKnROLL is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit

    Quote Originally Posted by Mike G
    Refers to evaporative emission controls. Could be the vacuum purge switch or the EVAP control solenoid. Check the ECS fuse in the engine compartment block or the fuses on the main panel. The solenoids are mounted on the top side of the motor so if they need replacing, it should be doable.

    --Mike
    Thanks for the reply Mike.
    The fuse was OK.
    You're right, they are easy to get to, right next to the EGR valve.
    Is it possible to get the part #'s from some place on the forum or from someone?
    Thanks
    Rock

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit


  6. #5
    ROCKnROLL's Avatar
    ROCKnROLL is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit

    Thanks Ranger.
    Is this 1998-2004 parts list going to be accurate for a 97 seville?
    The two parts I need info on are:
    evaporative emission control solenoid
    vacuum purge switch
    Thanks

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit

    I would think that they are the same but you might want to cross check the numbers with you local Cadillac parts dept.

  8. #7
    cadillacjoel23 is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit

    is there a diagram showing how to connect the solenoid back up correctly..i think theres a vacuum hose missing somewhere

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: DTC P1645 EVAP Solenoid Output Circuit

    For which car? You have two listed.

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