Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

Results 1 to 5 of 5

Thread: SERVICE SOON telltale light!!

  1. #1
    tallpat's Avatar
    tallpat is offline Cadillac Owners Fanatic
    Automobile(s): 1986 Coupe Deville
    Join Date
    Oct 2006
    Location
    Columbia, Maryland, United Sta
    Posts
    138

    Smile SERVICE SOON telltale light!!

    Hi I am directing this too the HT4100 experts. My 86 CDV running very nicely but on occasion my Service soon telltale light comes on and stays on.
    when I shut off the car and restart its gone I haven't pull the codes yet. I thought I read that these lights are nortorious for going off for no reason.
    Or maybe I have an O2 sensor going bad. any ideas I will post any codes I get ASAP.

    Thanks
    Tallpat


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
    Join Date
    Jun 2005
    Location
    Michigan
    Posts
    668

    Re: SERVICE SOON telltale light!!

    Check your codes by pressing and holding "off" and "warmer," that should tell you what the issue is. Watch the Fuel Data Center for the codes and check the OBD I listing at the top of the forum page.

  4. #3
    noahsdad's Avatar
    noahsdad is offline Cadillac Owners Connoisseur
    Automobile(s): '87 SDV
    Join Date
    Jun 2005
    Location
    Michigan
    Age
    57
    Posts
    1,296

    Re: SERVICE SOON telltale light!!

    Agreed. The SES light is almost always set by an issue that produces a trouble code. Since the car is running okay and the light is intermittent, my money is on a TPS adjustment or an EGR problem.

  5. #4
    86cadman is offline Cadillac Owners Member
    Automobile(s): 1986 Cadillac Sedan DeVille, 1998 Cadillac Sedan DeVille
    Join Date
    Oct 2006
    Location
    VA
    Posts
    75

    Re: SERVICE SOON telltale light!!

    Probably just a TPS error, mine did it all the time usually when I put the gas down and held it there, try letting up immediently and going lite on the gas when it comes on, or tap the pedal a few times, that worked to make mine go off, not really a problem, just a nuisance though.

  6. #5
    carnut is offline Cadillac Owners Master
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003
    Location
    california
    Age
    69
    Posts
    6,688

    Re: SERVICE SOON telltale light!!

    These are at best, guesses. Perform the on board diagnostics and post the codes found. The service eng light always means something is working incorrectly or not at all. Upon restart, the ECM will wait to retest the faulty system and if still faulty, will turn on the light again.


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum