1999 STS wont start
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1999 STS wont start in Past Cadillac Vehicle Discussion; Has been working fine then came to start it this afternoon and won't start when I tried to start it ...
  1. #1
    diceman8874 is offline Cadillac Owners Member
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    1999 STS wont start

    Has been working fine then came to start it this afternoon and won't start when I tried to start it everything lit up on dash but the display say its in drive changed through the gear selector but the D on the display does not change HELP please


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  3. #2
    General Papi's Avatar
    General Papi is offline Cadillac Owners Member
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    Re: 1999 sts wont start

    Have you tried to start with shifter in n position?

  4. #3
    diceman8874 is offline Cadillac Owners Member
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    Yes but still nothing

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it .......
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    Re: 1999 sts wont start

    Check the shift quadrant on top of the transmission - where the cable attaches - right in front of where your gas pedal toes would lie - under the hood, at the firewall.

    Next is the neutral safety switch - not sure about a '99 - ask N*Caddy.

    last is the IMS - Internal Mode Switch - on the valve body inside the transmission: pan drop, valve body drop. Not fun.

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1999 sts wont start

    Hold the key in the start position with your foot on the brake and run the shifter through all positions. Does it crank at any point?

    Pull the DTC's. Post them AND their definitions.

  7. #6
    diceman8874 is offline Cadillac Owners Member
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    Pulled the code and its says p0603

  8. #7
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by Ranger
    Pull the DTC's. Post them AND their definitions.

  9. #8
    diceman8874 is offline Cadillac Owners Member
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    Car is now working fine filled the cable from gear selector through the fire wall to the gear linkage pushed this back by hand which took it back into park and the car started first time

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