Relay fix for service ride control dtc code I039
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Relay fix for service ride control dtc code I039 in Past Cadillac Vehicle Discussion; Hello I was getting a service ride control and traction disabled message on my DIC in my 95 Sedan Deville. ...
  1. #1
    Stroked Cutlass is offline Cadillac Owners Member
    Automobile(s): 1995 Deville
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    Relay fix for service ride control dtc code I039

    Hello I was getting a service ride control and traction disabled message on my DIC in my 95 Sedan Deville. I went to check the module inside the trunk and found that it already has the relay fix. I found that the ground had become disconnected and after I hooked it back up the SRC message went away. I still get traction disabled and 2 DTC codes which are T072 and T077. I have some questions about this fix and these codes. My first question is how do I figure out if they just added the relay and not replaced the struts? What should I look for on the struts to see if they are the original? I would also like to know if this relay fix will effect the leveling system? I heard the compressor a few times when I first got the car but not lately. I would also like to know what these codes mean? I can clear them out of the DIC under IPC but they eventually come back. My traction button does work sometimes when I press it, traction comes on and I can turn it off. I am also getting I032 sometimes and I have not disconnected that battery. The I032 code usually says history but sometimes will be current. Thanks for your help.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Relay fix for service ride control dtc code I039

    Codes are meaningless without their definitions. Help us help you and always post them with the codes. See the DTC Sticky for a link to the definitions.

  4. #3
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: Relay fix for service ride control dtc code I039

    the relay "fix" is used to simply turn off the SERVICE RIDE CONTROL message -
    when the electronic portion of the shocks has failed -

    it has no effect on automatic level control -

    how do I figure out if they just added the relay and not replaced the struts
    well - my thought would be -
    if they had replaced the struts -
    they wouldn't need the relay -

    so - when the electronic part of the strut failed -
    and the SERVICE RIDE CONTROL message appeared -
    they added the relay -
    BUT I COULD BE WRONG -

    What should I look for on the struts to see if they are the original?
    almost impossible to tell on an 18 year old car -
    unless they look "too new" - or "too clean" -

    for code definitions - there is a link within the
    How To Pull Codes (DTC's) sticky -


  5. #4
    purelux is offline Cadillac Owners Fanatic
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    T072 is serial link fault, loss of communication
    T077 pcm serial data line/link malfunction

    I found the t077 in a previous post saying it's a mystery code but was found on alldata.

    http://www.cadillacforums.com/forums...ns-over-7.html

  6. #5
    Stroked Cutlass is offline Cadillac Owners Member
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    Re: Relay fix for service ride control dtc code I039

    Quote Originally Posted by Ranger View Post
    Codes are meaningless without their definitions. Help us help you and always post them with the codes. See the DTC Sticky for a link to the definitions.
    Sorry I will remember this in the future thanks for the link.

    Quote Originally Posted by basscatt View Post
    the relay "fix" is used to simply turn off the SERVICE RIDE CONTROL message -
    when the electronic portion of the shocks has failed -

    it has no effect on automatic level control -

    how do I figure out if they just added the relay and not replaced the struts
    well - my thought would be -
    if they had replaced the struts -
    they wouldn't need the relay -

    so - when the electronic part of the strut failed -
    and the SERVICE RIDE CONTROL message appeared -
    they added the relay -
    BUT I COULD BE WRONG -

    What should I look for on the struts to see if they are the original?
    almost impossible to tell on an 18 year old car -
    unless they look "too new" - or "too clean" -

    for code definitions - there is a link within the
    How To Pull Codes (DTC's) sticky -
    I was asking about the struts cause I was under the impression the proper way to fix was to use the relay only after you replaced struts with aftermarket non air struts. Can you explain to me how the leveling system works? Also why do the struts need air? Thanks

    Quote Originally Posted by purelux View Post
    T072 is serial link fault, loss of communication
    T077 pcm serial data line/link malfunction

    I found the t077 in a previous post saying it's a mystery code but was found on alldata.

    http://www.cadillacforums.com/forums...ns-over-7.html
    Thank you for posting the codes and meanings.

  7. #6
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: Relay fix for service ride control dtc code I039

    I was asking about the struts cause I was under the impression the proper way to fix was to use the relay only after you replaced struts with aftermarket non air struts. Can you explain to me how the leveling system works? Also why do the struts need air? Thanks
    ----------------------
    I think you are confusing the terms -
    struts - shocks - electronic suspension - and level control -

    struts are in the front -

    shocks are in the rear -

    electronic suspension is on both front and rear -
    it controls how soft or firm the ride is
    by electronically changing the valves inside the struts and shocks -

    level control is a system that uses an air compressor -
    and air bladders built into the rear shocks -
    when an additional load is in the back seat and/or trunk - the rear end sags -
    the compressor pumps up the air bladders in the rear shocks -
    to raise the rear of the car - back to the proper ride height -

    only the rear shocks are part of the automatic leveling system
    the front struts do not have air bladders -
    --------------------------

    the SERVICE RIDE CONTROL message could be set
    by faulty electronics in either the front struts or rear shocks -

    the relay is used to simply turn off the SRC message -
    regardless of what caused the message to appear -

    the SRC message has nothing to do with the Automatic Level Control -

  8. #7
    Stroked Cutlass is offline Cadillac Owners Member
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    Re: Relay fix for service ride control dtc code I039

    Okay thanks for clarifying that matter for me. I thought they looked like shocks to me in the rear but I was told they were struts. Now I am trying to get the traction disabled message to stop.

  9. #8
    purelux is offline Cadillac Owners Fanatic
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    Is your battery in good condition, sometimes you can get erroneous codes if its low charge or has a bad cell/short. Also try cleaning the contacts where the wheel speed sensors plug into the harness by each wheel. I had my RL sensor set a DTC on rough roads. I unplugged sensor sprayed electronics cleaner on let dry then dielectric grease on it been good since.

  10. #9
    SUPER LAC DEVILLE's Avatar
    SUPER LAC DEVILLE is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by basscatt
    I was asking about the struts cause I was under the impression the proper way to fix was to use the relay only after you replaced struts with aftermarket non air struts. Can you explain to me how the leveling system works? Also why do the struts need air? Thanks
    ----------------------
    I think you are confusing the terms -
    struts - shocks - electronic suspension - and level control -

    struts are in the front -

    shocks are in the rear -

    electronic suspension is on both front and rear -
    it controls how soft or firm the ride is
    by electronically changing the valves inside the struts and shocks -

    level control is a system that uses an air compressor -
    and air bladders built into the rear shocks -
    when an additional load is in the back seat and/or trunk - the rear end sags -
    the compressor pumps up the air bladders in the rear shocks -
    to raise the rear of the car - back to the proper ride height -

    only the rear shocks are part of the automatic leveling system
    the front struts do not have air bladders -
    --------------------------

    the SERVICE RIDE CONTROL message could be set
    by faulty electronics in either the front struts or rear shocks -

    the relay is used to simply turn off the SRC message -
    regardless of what caused the message to appear -

    the SRC message has nothing to do with the Automatic Level Control -
    Not trying to thread jack but what if I have no codes for the elc and its not working

    Everything looks fine, I've disconnected and reconnected all the plugs I could find and I don't see any bad fuses... I should get a code if any part of the elc system has failed, right???

  11. #10
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    A bad ELC compressor won't set a code.

  12. #11
    SUPER LAC DEVILLE's Avatar
    SUPER LAC DEVILLE is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by MoistCabbage
    A bad ELC compressor won't set a code.
    I was thinkn it was that but wasn't sure about the code deal
    So I'll go pull one ... or two , out the junk yard

    Thanks MC

  13. #12
    Stroked Cutlass is offline Cadillac Owners Member
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    Re: Relay fix for service ride control dtc code I039

    Found a loose ground under the airbox on the ABS and now I have no traction disabled come across the dic and no dtc's. I seen this on another post and forgot were but I would not have found it otherwise. Thanks

  14. #13
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: Relay fix for service ride control dtc code I039

    Quote Originally Posted by SUPER LAC DEVILLE View Post
    I was thinkn it was that but wasn't sure about the code deal
    So I'll go pull one ... or two , out the junk yard

    Thanks MC
    -----------------------------------
    there are codes for faulty exhaust solenoid on the compressor head -
    but that's all -

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