第一个字符:故障所属的系统
P = Powertrain 动力传输系统
B = Body 车身
C = Chassis 底盘
U = Network 网络
第二个字符:故障类型
第二个字符表明这个故障码是一个由ISO/SAE标准定义的故障码(Core DTCs),还是由车辆制造厂定义、尚未统一的故障码(Non-uniform Code)。
车身系统组(Body system groupings)
B0xxx ISO/SAE controlled
B1xxx manufacturer controlled
B2xxx manufacturer controlled
B3xxx reserved by document
底盘系统组(Chassis system groupings)
C0xxx ISO/SAE controlled
C1xxx manufacturer controlled
C2xxx manufacturer controlled
C3xxx reserved by document
动力传动系统组(Powertrain system groupings)
P0xxx ISO/SAE controlled
P1xxx manufacturer control
P2xxx ISO/SAE controlled
P3xxx manufacturer controlled and ISO/SAE reserved
网络组(Network groupings)
U0xxx ISO/SAE controlled
U1xxx manufacturer controlled
U2xxx manufacturer controlled
U3xxx manufacturer controlled and ISO/SAE reserved
第三个字符:子系统
第三个字符定义了故障所属的子系统。