Tag: OBD-I

Posts related to OBD-I

OBD-II (On-Board Diagnostics) codes are divided into four main sections, each prefixed with a letter. These four prefixes are as follow:

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

The number following the prefix tells you if the code is a generic OBD-II code or a manufacturer specific code. Generic codes start with a 0 (zero) while manufacturer specific codes start with a 1 (one).

The third number in the OBD-II code refers to any of the following sub-systems:

1 = Emission Management
2 = Injector Circuit
3 = Ignition/Misfire
4 = Emission Control
5 = Vehicle Speed and Idle Control
6 = Computer and Output Circuit
7 = Trans
8 = Trans
9 = SAE (reserved)
0 = SAE (reserved)

The last numbers in the code refer to a variable which is specific to the main problem.

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