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OBDII Trouble Code Diagnosis


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Old 01-13-2008, 02:37 AM   #1
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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.

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Old 12-24-2013, 12:11 AM   #2
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I have these codes on my 1998 & 2001 Silverado s they are not specific as to what to actually look for. Can anyone help me? I'm a new member

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Old 12-27-2013, 06:13 PM   #3
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Quote:
Originally Posted by kstrohl View Post
I have these codes on my 1998 & 2001 Silverado s they are not specific as to what to actually look for. Can anyone help me? I'm a new member
Which codes are being displayed?

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