OBD-II Code Categories

All OBD-II diagnostic trouble codes are organized into four main categories. Select a category to browse all codes within it.

Powertrain Codes

1,500+ codes

Powertrain codes cover engine, transmission, and drivetrain systems. These are the most common OBD-II codes. Includes fuel system, ignition, emissions, and transmission codes.

P0xxx - Generic PowertrainP1xxx - Manufacturer SpecificP2xxx - Generic PowertrainP3xxx - Generic/Manufacturer

Body Codes

300+ codes

Body codes relate to the passenger compartment systems including airbag/SRS, HVAC, instrument panel, lighting, seats, and power accessories.

B0xxx - Generic BodyB1xxx - Manufacturer SpecificB2xxx - Manufacturer SpecificB3xxx - Manufacturer Specific

Chassis Codes

200+ codes

Chassis codes cover anti-lock braking system (ABS), traction control, electronic stability, steering, and suspension systems.

C0xxx - Generic ChassisC1xxx - Manufacturer SpecificC2xxx - Manufacturer SpecificC3xxx - Manufacturer Specific

Network Codes

400+ codes

Network codes relate to the vehicle communication bus (CAN, LIN, etc.), module communication errors, lost signals, and network faults between electronic control units.

U0xxx - Generic NetworkU1xxx - Manufacturer SpecificU2xxx - Manufacturer SpecificU3xxx - Manufacturer Specific