Alt-Codes can be typed on Microsoft Operating Systems: First make sure that numlock is on, Then press and hold the ALT key, While keeping ALT key pressed type the code for the symbol that you want and release the ALT key. Unicode codes can not be typed. Codes can be used within HTML, Java.etc programming languages. ATA Chapter Descriptions CH CH System 83 11 Placards 21 21 Air Conditioning 49 22 Autopilot 22 23 Communications 91 24 Electric Power 23 25 Equipment & Furnishing 52 26 Fire Protection 24 27 Flight Controls 72 28 Fuel 75 29 Hydraulic Power 76 30 Ice & Rain Protection 78 31 Instruments 73 32 Landing Gear 74 33 Lights 77 34 Navigation 79 35 Oxygen 72 36 Pneumatic 80 37 Vacuum 72 38 Water/Waste.
Standard or generic fault codes are a list of codes common to all manufacturers.
This list of faults, also called DTC (for Data Trouble Code) has been defined so that any diagnostic device can read and decode them. They have a standard format as shown below:
The first letter indicates the family of DTC.This list of faults, also called DTC (for Data Trouble Code) has been defined so that any diagnostic device can read and decode them. They have a standard format as shown below:
P: Powertrain, (i.e. engine and gearbox)
C: Chassis
C: Chassis
B: Body
U: User network
U: User network
The first digit indicates if the code is generic or not (green digit):
0: Generic fault
As the list of generic OBD codes is not always sufficient, manufacturers can add as many of their own codes as they need.
The last 3 digits correspond to an incremented number (purple digits).
This may be a hexadecimal number (i.e. from 0 to 9 + from A to F). For P family codes, sub-families have been defined using the 1st digit (in this example the '3'):
This may be a hexadecimal number (i.e. from 0 to 9 + from A to F). For P family codes, sub-families have been defined using the 1st digit (in this example the '3'):
0 , 1 and 2: for the air/fuel mixture
3 : for the ignition system
4 : for checking auxiliary emissions
5 : for engine idling
3 : for the ignition system
4 : for checking auxiliary emissions
5 : for engine idling
6 : for the onboard computer and ancillary outputs
7, 8 and 9: for the transmission (gearbox)
A, B and C : for hybrid propulsion
7, 8 and 9: for the transmission (gearbox)
A, B and C : for hybrid propulsion
These OBD codes were standardized using SAE J2012 and ISO 15031-6 standards which, to our knowledge, contain about 11 000 definitions in the most recent version.
Below you will find a list of the most commonly used codes. Our software contains all of the 11 000 codes. Don't hesitate to download it. It is free and, using an ELM327 or ELM323 interface, can be used to read the fault codes. For more details, go to our EOBD-Facile car diagnostic software page.