DTC Codes by Vehicle System

This group covers the codes that monitor how much air enters the engine and how much fuel is injected to match it: mass air flow (MAF) and …

Codes for the circuits that deliver the fuel: injectors, the fuel pump and its relay, fuel rail pressure sensors and, on turbocharged engin…

Codes for misfires, ignition coils, spark plugs and the crankshaft and camshaft position sensors, which the computer needs to know when to …

Codes for the catalytic converter, the EVAP system that captures fuel tank vapors, the EGR valve and secondary air injection. These are the…

Codes for idle control, the vehicle speed sensor, cruise control and some auxiliary systems such as coolant temperature and the thermostat.…

Codes for the engine computer itself: internal memory, self-test, sensor reference voltages, relays controlled by the computer and output c…

Codes for automatic, CVT and dual-clutch transmissions: shift and pressure control solenoids, input and output speed sensors, torque conver…

B codes for airbags, seat belt pretensioners, climate control, central locking, power windows, alarm and lighting. Many of them do not turn…

C codes for the anti-lock braking system (ABS), stability control, wheel speed sensors, electric power steering and electronically controll…

U codes for lost communication between modules on the CAN or LIN network. When one module stops responding, the others report it, which is …