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Service engine light

Discussion in 'Chevy Trucks' started by dmk395, Sep 6, 2001.

  1. dmk395

    dmk395 Junior Member
    Messages: 19

    My service engine light pops on occasionally, as does my seatbelt light (while wearing the belt, or not, cannot differentiate). The mechanic said it was probalby nothing, just that its 12 years old.
    Any similar occurences with a 1989 ck2500 v-8 4x4
  2. 66Construction

    66Construction Senior Member
    Messages: 315

    I have a 90 k2500 and occasionaly the check engine light comes on, it doesn't stay on long. I don't get any trouble codes out of it. It took it to a mechanic and he got no trouble codes eithre, but said it could be a sensor getting ready to blow. Also he said in the mean time just think of it as Christmas, a blinking light on the tree. It runs great so I just ignore it, it doen't happen that often. It seems to happen when there is a drastic change in the weather from warm and dry to cold and wet, but it's not the only time it has happened
  3. plowking35

    plowking35 2000 Club Member
    from SE CT
    Messages: 2,923

    I have a 98 venture that does the same two things.
    Must be a bowtie thang.
  4. Mick

    Mick PlowSite.com Veteran
    from Maine
    Messages: 5,546

    I'm getting a similar thing and found this on a search. Mine is a '96 Chevy 3500 with 6.5TD. The "check engine soon light" comes on when I start it and stays on steady. I've checked the fluid levels and it seems so to run ok. Can anybody tell me what else is hooked to this light I could check?

    It's too early/late for Christmas and I don't like surprises :mad: . I'd like to keep control of "gifts" to the mechanic.
  5. Rob

    Rob PlowSite.com Veteran
    Messages: 306

    My Pontiac Grand Am has a check engine light. The code is if it is on steady then there is a problem with the emissions gear, if it is flashing then it is a problem with the fuel / ignition.

    I know it is not a truck but it is a GM product, so maybe some similarity in the light usage.

    Someone else can probably steer you better, but I thought I'd throw out the 2¢ I know !!

    Good Luck !
  6. Mick

    Mick PlowSite.com Veteran
    from Maine
    Messages: 5,546

    Thanks, Rob. Sounds reasonable that it would be similar problems. At least it doesn't sound like anything that's going to kill the truck before I can get it into the shop next week.
  7. wyldman

    wyldman Member
    Messages: 3,265

    The Check engine or Service Engine Soon light will come on to indicate a problem with the emission\fuel\ignition control system.

    If the light comes on,it should set a code which can be pulled with a proper code scanner or computer.

    If the light goes back out,then it means the computer has adapted,or compensated for the fault,or it is intermittant.

    If the light is on all the time,you have a hard fault,and the problem is there all the time.

    Fluid levels,oil pressure,eng temp do not affect the orange Check engine light.They will turn on the red engine light instead.

    Have the codes pulled out of it,or pull them yourself by jumpering the two terminals in the ALDL connector under the dash.
  8. wyldman

    wyldman Member
    Messages: 3,265

    Mick - your 6.5 TD still has an onboard computer,so if the light is on,there is a problem.You may,or may not notice it in the way it drives.You will need to pull the codes out of it to find out the root cause.
  9. Mick

    Mick PlowSite.com Veteran
    from Maine
    Messages: 5,546

    Thanks, Chris. It did exactly like you said - it was staying on all the time. I went out and drove it again this evening - the light went off when it started just like it was supposed to. So I guess the computer adapted.:nod:

  10. Crazy_Eddie

    Crazy_Eddie Member
    Messages: 38

    If you have a 95' or earlier, your truck is OBD and you don't need a scanner to pull codes.
    I have a 94' and under my steering column there is an adapter that looks like this...


    I used a paper clip to short A and B and the turn the ignition to the on position (just short of starting). Not sure if I remember this correctly, but the SES light will blink the 12 code twice (one slow, then two fast) then it will blink the code of the indicated trouble..

    So if you have a code 15, you should see the SES blink one slow, two fast, pause, the same code again (two code 12s), then one slow and five fast for the 15.

    Some one correct me if I'm wrong.....
  11. wyldman

    wyldman Member
    Messages: 3,265

    That will work for pulling codes on ODB1 equipped GM trucks and cars.It will not work for OBDII vehicles.

    If anyone tries this and needs a code looked up,just let me know.