99 Deville will not start
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 99 Deville will not start in Past Cadillac Vehicle Discussion; My 99 Deville had been sitting for over a month and when I went to start it it just turned ...
  1. #1
    bschelle is offline Cadillac Owners Fanatic
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    99 Deville will not start

    My 99 Deville had been sitting for over a month and when I went to start it it just turned over and never fired up. The shifter position is blinking, the THEFT SYSTEM PROBLEM-CAR MAY NOT RESTART and SERVICE AIR BAG messages are there. I by-passed the theft system years ago with a resistor in line and have never had a air bag used. Here is the list of codes:

    B1159-LOSS OF SERIAL DATA-KEY NOT RECEIVED
    B1160-LOSS OF SERIAL DATA-VIN NOT RECEIVED
    B1163-LOSS OF SERIAL DATA-NO LAMP RESPONSE
    B2750-PASSKEY DATA COMMUNICATIONS FAILURE
    U1096-LOSS OF COMMUNICATION WITH IPC
    U1255-SERIAL DATA LINE MALFUNCTION
    U1300-CLASS 2 SHORT TO GROUND

    Any help would be appreciated!

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  3. #2
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: 99 Deville will not start

    Off to the FWD section...

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The first step would be to have the battery charged and load tested. Replace if necessary, and go from there.

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    Ranger's Avatar
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    Re: 99 Deville will not start

    With those codes and a theft system bypass, anything is possible.

  6. #5
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
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    Batt problem I bet also, are those codes current or history?

  7. #6
    Ranger's Avatar
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    Re: 99 Deville will not start

    Not saying it is not possible, but if it where a battery problem I would have expected to see a low voltage code.

  8. #7
    bschelle is offline Cadillac Owners Fanatic
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    Re: 99 Deville will not start

    I did not record history or current. I will check tomorrow. It turns over like the battery is OK but I will charge it and see what happens.

  9. #8
    bschelle is offline Cadillac Owners Fanatic
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    Re: 99 Deville will not start

    I charged and load tested the battery and it tested good. The codes are now too numourus to recrd, Some of them are not normal that I have ever seen. Like, PO12==, PO=2== ans so on. The other flashing messages are still there. It still spins over but doesn't start.

  10. #9
    Ranger's Avatar
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    Re: 99 Deville will not start

    Sometimes pulling battery power will add codes. When I had my battery replaced under warranty it had a slew of codes when I got it back.

    Have you verified fuel pressure?

  11. #10
    bschelle is offline Cadillac Owners Fanatic
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    Re: 99 Deville will not start

    Not yet. I will do it tomorrow!

  12. #11
    bschelle is offline Cadillac Owners Fanatic
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    Re: 99 Deville will not start

    The pressure was 24 when I turned the key on and went up to 45 when I cranked it over. The pressure held after I shut the key off.

  13. #12
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    Re: 99 Deville will not start

    24 is WAAAY too low. 45 is normal, but the fact that it increased and stayed there leads me to believe the fuel pump is not the problem.

  14. #13
    bschelle is offline Cadillac Owners Fanatic
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    Re: 99 Deville will not start

    So, any quess why the error codes are going crazy?

  15. #14
    Ranger's Avatar
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    Re: 99 Deville will not start

    Certainly appears to be some sort of communications problem. Weak battery, bad ground, short circuit, bad PCM, etc, etc. Looks like it's gonna be a tough one to nail down.

  16. #15
    Bugsy13ell is offline Cadillac Owners Member
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    My car will not start either, it keeps reading "Starting Disabled Due To Theft System" and then goes "Car May Not Restart" in the MSG center. I need help. Also, the Security is not flashing as it reads that.

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