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Thread: Getting Diagnostic Trouble Codes (DTC) without DTC reader

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    Getting Diagnostic Trouble Codes (DTC) without DTC reader





    OBD-II codes consist of a number of parts. Here is a sample OBD2 code: P0171

    Here is a breakdown of what each digit of the code means:

    First Character - System

    The first character identifies identifies the system related to the trouble code.

    * P = Powertrain
    * B = Body
    * C = Chassis
    * U = Undefined

    Second Digit - Code Type

    The second digit identifies whether the code is a generic code (same on all OBD-II equpped vehicles), or a manufacturer specific code.

    * 0 = Generic (this is the digit zero -- not the letter "O")
    * 1 = Enhanced (manufacturer specific)

    Third Digit - Sub-System

    The third digit denotes the type of sub-system that pertains to the code

    * 1 = Emission Management (Fuel or Air)
    * 2 = Injector Circuit (Fuel or Air)
    * 3 = Ignition or Misfire
    * 4 = Emission Control
    * 5 = Vehicle Speed & Idle Control
    * 6 = Computer & Output Circuit
    * 7 = Transmission
    * 8 = Transmission
    * 9 = SAE Reserved
    * 0 = SAE Reserved

    Fourth and Fifth Digits

    These digits, along with the others, are variable, and relate to a particular problem




    Here is a website that lists a large amount of generic DTC Codes:

    http://www.skpang.co.uk/dtc_list.htm
    Last edited by Knappster; 10-03-2010 at 05:44 PM.
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