Here are the explanations of the make up of a diagnostic fault code Prefix:
First (Character) | Identifies the Related System |
P | Powertrain |
B | Body |
C | Chassis |
U | Network |
Second (Digit) | Type of Code |
0 | Complies with EOBD Standard |
1 | Manufacturer Specific Enhanced |
Third (Digit) | Sub-System Affected |
0 | Fuel and air metering and auxiliary emission controls |
1 | Fuel & Air Metering |
2 | Fuel & Air Metering Injector Circuit |
3 | Ignition System or Misfire |
4 | Auxilliary Emission Controls |
5 | Vehicle Speed & Idle Control Systems |
6 | Computer Output Circuit |
7 | Transmission |
8 | Transmission |
Fourth & Fifth (Digits) | These refer to the specific fault within the sub-system |