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Thread: error code 37 on 1993 GMC Jimmy

  1. #1 error code 37 on 1993 GMC Jimmy 
    Car Enthusiast CF Newbie
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    May 2007
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    Year
    1993
    Make
    GMC
    Model
    S15 Jimmy
    I have an error code 37 on my readout but I can not find what that is pertaining to. The car turns over but not start. Any idea?
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  2. #2  
    911? I dial .357! CF Moderator
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    Gazz Guzzla





    Circuit Description:
    The normally closed brake switch supplies a 12 volt signal on CKT 420 to the PCM. The signal voltage is opened when the brakes are applied. An incorrect brake signal can affect TCC and fourth gear operation, in hot mode.
    DTC 37 will set when CKT 420 is open, vehicle speed below 5 mph for 6 seconds, then between 5 mph and 20 mph for 6 seconds, then greater than 20 mph for 6 seconds, for a complete total of seven times.

    Test Description:
    Number(s) below refer to circled number(s) on the diagnostic chart.

    1. This test checks for voltage at brake switch.
    2. This test simulates brake switch closed or brakes "OFF."
    3. This test checks CKT 420 from brake switch to PCM.
    4. This test opens CKT 420 and simulates brakes being applied.

    Diagnostic Aids:

    * Refer to "Diagnosis By Symptom. See: Symptom Related Diagnostic Procedures
    * Check customer driving habits and/or unusual traffic conditions (i.e. stop and go expressway traffic).
    RIP Eric Taney
    4/29/1991-8/4/2010


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  3. #3  
    Car Fanatic CF Senior Member
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    Year
    1992
    Make
    GMC
    Model
    1500
    Don't think that code has anything to do with it not starting.
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  4. #4  
    S10 GOD NUKKAS CF Member
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    sure it would, cuz when you throw a code, it tells the computer something isn't right, and if it has something to do with brakes, prolly not a good thing if it would fire and you have no brakes, or no power brakes..................makes some sense to me...........

    SHAVED LIKE A PORNSTAR!!!!!
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  5. #5  
    Car Enthusiast CF Member
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    Year
    2000
    Make
    GMC
    Model
    Yukon
    probably a malfunctioning sensor. A friend of mine had this problem before and found that he has a loosed sensor. I forgot the specific sensor. check this site they might have something that can help you out. like a repair manual or some sort. gmc truck parts
    To Win, or not To Race a all...
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