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  OBD II Fault Codes Reference Guide    
   

The Diagnostic Trouble Code numbering follows a standardized structure. All Diagnostic Trouble Codes have a letter followed by a 4-digit number (e.g. P1234).

The first letter defines the system designation:

  
 

First Letter

 System Designation        
  P Power train        
  C Chassis        
  B Body        
  U Network Communications systems        
 
 
  For EOBD, first digit defines code type  
 

First Digit

 Code        
  0 Standard EOBD        
  1 Defined by vehicle manufacturer        
  2 Standard EOBD        
  3 Network Communication        
 
   
 

Second digit defines system identification

  
 

Second Digit

 Meaning        
 

0

Standard Code. Refer to generic P0 code list.

  

1

Fuel or Air Metering and Auxiliary Emission Controls

2

Fuel or Air Metering and Auxiliary Emission Controls

3

Ignition System or Misfire

4

Auxiliary Emission Controls

5

Speed control (Idle, vehicle and Auxiliary Inputs)

6

Trip Computer and Auxiliary Inputs

7

Transmission

8

Transmission

9

Transmission

 
   
 

Other Code Groups which may be read:

  

P10-- to P12--

Fuel and Air Metering and Auxiliary Emission Controls

P13--

Ignition System or Misfire

P14--

Auxiliary Emission Controls

P15--

Vehicle Speed, Idle Control, and Auxiliary Inputs

P16--

Computer and Auxiliary Outputs

P17-- to P19--

Transmission

P2---

SAE Controlled DTCs

P20-- to P22--

Fuel and Air Metering and Auxiliary Emission Controls

P23--

Ignition System or Misfire

P24-- to P29--

SAE Reserved

P3---

Manufacturer Controlled and SAE Reserved

P30-- to P32--

Fuel and Air Metering and Auxiliary Emission Controls

P33--

Ignition System Misfire

P34-- to P39--

SAE Reserved

Copyright notice

This page and web site contents was created by Sinclair Easton 14th May 2006.