What are OBD2 fault codes? And what are their explanations. OBD2 fault codes list. What is OBDII fault code? …..
What is OBD-II Fault Code and what does it mean?
The internal memory of malfunctioning vehicles stores diagnostic codes. It is easier to identify the problem in the vehicle this way. You can consult the vehicle manual for further information and to perform the required tests.
If the diagnostic tool reports an error in the sensor, it may not be possible to fix the problem by replacing the sensor. Other parts or cables may also be responsible for the malfunction.
Fault codes are standard for all manufacturers. These codes are also known as DTC (Data Trouble Code) and can be read by any diagnostic device. These codes are in a standard format, as shown below.
Fault codes are composed of four numbers and a letter. The fault cluster is indicated by the first letter.
Primary Digit (Letter).
P / Powertrain Refers to any faults that are related to the powertrain (engine or transmission, fuel system, etc.).
C/Chassis: This refers to all mechanical systems located outside of the passenger compartment.
B / Body This refers to systems like air conditioning or airbags that are typically located in the passenger room.
U / UserNetwork: Refers the vehicle’s built in control modules and related system.
Second Stage
The second character is usually 0 or 1, and it indicates whether the code belongs to a manufacturer or generic.
0: General (or standard) fault code. All OBD-II-equipped brands have adopted this code.
1: Manufacturer-specific fault code. These codes are only applicable to certain models and makes, and are therefore less common.
The numbers 2/3 are not often used. Their meanings can change depending on which letter they were written before. Fault codes beginning with 2 or 3 indicate that the fault code is manufacturer-specific, with some exceptions.
Third Step
The third row may contain a number of characters. Manufacturers may add their own codes to supplement the existing generic codes. The third digit may correspond to any number between 0 and 9, or letters A, B C, D, E, F.
0: Air/fuel metering, auxiliary emission control
1: Air/fuel measurement
2: Air/fuel metering (injector circuit)
3: Misfires and the ignition system
4: Control of auxiliary emissions
5: Vehicle speed control and idle
6: Controls of input/output signals from the computer onboard
7, 8 and 9: Transmission system checks
A, B, C, D, E, F: Hybrid fault codes
Fourth and Fifth Digits
The last two characters in the fault code represent a number that accurately describes the problem. It can range from 0 to 99.
Take P0301 for example.
General, powertrain, ignition system (if 01 is at the end the code), means Cylinder 1 misfire detected.
OBD-II Fault codes List
To search for fault codes, you can use the Ctrl+F combination.
