hi, i just bought my sts and......
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Suspension, Brakes and Tires Discussion, hi, i just bought my sts and...... in Item Specific Cadillac Discussion; i am having a problem where i will be driving , i go to brake and the abs and traction ...
  1. #1
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    hi, i just bought my sts and......

    i am having a problem where i will be driving , i go to brake and the abs and traction control lights come on and there is a muffled sound and a slight moving of the brake pedal as if something is turning on and off (so sort of pump or compressor ) it only happens for a second ....does anyone have a clue about what im talking about . it would be a big help ..thanks will martin

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  3. #2
    codewize's Avatar
    codewize is offline Cadillac Owners Master
    Automobile(s): 1989 STS / 1991 d'Elegance / 2001 DTS / 2002 DTS
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    Re: hi, i just bought my sts and......

    What year is the car. I know that on the early ABS systems, like on my 89, I feel that if I don't let the system boot up all the way before driving.

    Like if I starts the car and drive before the ABS lite goes off. If it's happening regularlly I would have to guess that the ABS module may to blame
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  4. #3
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
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    Re: hi, i just bought my sts and......

    Yes what year is it? If it's a 90's or later model then you can retrieve the codes from the dashboard and that will tell you what's wrong with the system.

  5. #4
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    it is a 1997 sts i checked for codes i am getting these codes ....
    pcm p0138
    tcs c1255
    tcs c1221
    tcs c1225
    rss c1716
    rss c1717
    rss c1738

    i hope they arent major ....

  6. #5
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
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    Re: hi, i just bought my sts and......

    C1255 - EBTCM (Electronic Brake and Traction Control Module) Internal Malfunction (Probably from the C1221, and C1225 codes. Fix the hub/bearing and clear the codes to see if they come back)

    C1221 - Left Front Wheel Speed Sensor Input Signal is 0 (Check the wiring to the drivers side hub/bearing... If the wiring looks good then replace the hub/bearing)
    C1225 - Left Front Excessive Wheel Speed Variation (Same as above)

    C1716 - Right Front Damper Actuator Short Circuit to GroundOn the front passenger side strut, look at the wiring to that strut and check how many ohms of resistance there is between the two terminals on the plug going to the strut. Spray WD-40 in the plugs)
    C1717 - Right Front Damper Actuator Open Circuit (Same as above)

    C1738 - Exhaust Solenoid Valve Short to GND (The exhaust valve is in the compressor. There's a relay center in the trunk (attached to the back of the back seat, behind the fiberglass wall of the trunk) that has a relay to the exhaust valve. I would check that first, and jump the terminals with a paper-clip to see if I could activate it. You should hear it click)

  7. #6
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    thanks i try that i hope i can fix it .....this is a lot different then my prelude a lot my complicated ...lol

  8. #7
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    alright i checked and reset everything .....all the codes listed above were history except the c1717 that one says current

  9. #8
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    is the history important ??

  10. #9
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    has anyone had the problem where when you hit the brake it sounds like a pump is turning off and you can feel it in your foot too??

  11. #10
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    anyone???

  12. #11
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
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    Re: hi, i just bought my sts and......

    Sorry I didn't get back to you untill now.

    The History codes are just as important as the Current codes. History means that the problem occured at least once in one of the last 50 ignition cycles. Current means that the problem is currently being sensed.

    I personally ignore whether it says History or Current. Either way, there was a problem there, and as with all problems it should be looked at.



    Did you change out your hub/bearing yet? What's happening is the wheel speed sensor in the hub/bearing went bad. So when you move the car, the computer will sense that only three wheels are moving and it will think that the fourth one is being dragged. Thus it will cycle the ABS pump to slow you down and get that wheel spinning again. When it sees that nothing is working to get that wheel moving again, it gives up and throws codes.

  13. #12
    willywonka00 is offline Cadillac Owners Member
    Automobile(s): 1999 cadillac sts
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    Re: hi, i just bought my sts and......

    thanks a lot for all your help i changed the wheel bearing/hub and it fix it perfectly ...only thing left is "service ride control"....lol

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