OBD-II fault codes

1971 generic codes, each with what it means, what usually causes it and what to check first. Find a code, or read it straight from your car with Pin16 and an ELM327 adapter.

Find a code

Browse by system

BBodyCabin and body electronics: climate control, seats, lighting, locking, airbags and restraint systems.by structure
CChassisMechanical systems outside the powertrain: braking, ABS, traction and stability control, steering, suspension and wheel speed sensing.by structure
PPowertrainEngine, transmission and emissions-related systems. The largest group by far, and the one tied to the check-engine lamp.1673 codes
UNetwork and communicationThe vehicle's data buses and the modules on them. These codes usually indicate a module that has stopped responding or a wiring fault on the bus, rather than a mechanical failure.298 codes

See the whole tree →

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

Get Pin16 on Google Play