Full list of the OBD2 DTC from P0400 to P0499

Description of the standard trouble OBD codes by family

Standard or generic fault codes are a list of codes common to all manufacturers.
This list of faults, also called DTC (for Data Trouble Code) has been defined so that any diagnostic device can read and decode them. They have a standard format as shown below:

data trouble code P0301
The first letter indicates the family of DTC.

P: Powertrain, (i.e. engine and gearbox)
C: Chassis
B: Body
U: User network

The first digit indicates if the code is generic or not (green digit):

0: Generic fault
1: Manufacturer fault

As the list of generic OBD codes is not always sufficient, manufacturers can add as many of their own codes as they need.

The last 3 digits correspond to an incremented number (purple digits).
This may be a hexadecimal number (i.e. from 0 to 9 + from A to F). For P family codes, sub-families have been defined using the 1st digit (in this example the "3"):


0 , 1 and 2: for the air/fuel mixture
3 : for the ignition system
4 : for checking auxiliary emissions
5 : for engine idling
6 : for the onboard computer and ancillary outputs
7, 8 and 9: for the transmission (gearbox)
A, B and C : for hybrid propulsion

These OBD codes were standardized using SAE J2012 and ISO 15031-6 standards which, to our knowledge, contain about 50000 definitions in the most recent version.

Below you will find a list of the most commonly used codes. Our software contains all of the 5000 codes. Don't hesitate to download it. It is free and, using an ELM327 or ELM323 interface, can be used to read the fault codes. For more details, go to our EOBD-Facile car diagnostic software page.


Select the family of the DTC (OBD codes)


DTC from P0400 to P0499 (auxiliary emissions control)

OBD Code Description
P0400Exhaust Gas Recirculation Flow Malfunction
P0401Exhaust Gas Recirculation Flow Insufficient Detected
P0402Exhaust Gas Recirculation Flow Excessive Detected
P0403Exhaust Gas Recirculation Circuit Malfunction
P0404Exhaust Gas Recirculation Circuit Range/Performance
P0405Exhaust Gas Recirculation Sensor A Circuit Low
P0406Exhaust Gas Recirculation Sensor A Circuit High
P0407Exhaust Gas Recirculation Sensor B Circuit Low
P0408Exhaust Gas Recirculation Sensor B Circuit High
P0409Exhaust Gas Recirculation Sensor A Circuit
P0410Secondary Air Injection System Malfunction
P0411Secondary Air Injection System Incorrect Flow Detected
P0412Secondary Air Injection System Switching Valve A Circuit Malfunction
P0413Secondary Air Injection System Switching Valve A Circuit Open
P0414Secondary Air Injection System Switching Valve A Circuit Shorted
P0415Secondary Air Injection System Switching Valve B Circuit Malfunction
P0416Secondary Air Injection System Switching Valve B Circuit Open
P0417Secondary Air Injection System Switching Valve B Circuit Shorted
P0418Secondary Air Injection System Relay A circuit Malfunction
P0419Secondary Air Injection System Relay B Circuit Malfunction
P0420Catalyst System Efficiency Below Threshold (Bank 1)
P0421Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0422Main Catalyst Efficiency Below Threshold (Bank 1)
P0423Heated Catalyst Efficiency Below Threshold (Bank 1)
P0424Heated Catalyst Temperature Below Threshold (Bank 1)
P0425Catalyst Temperature Sensor (Bank 1 Sensor 1)
P0426Catalyst Temperature Sensor Range/Performance (Bank 1 Sensor 1)
P0427Catalyst Temperature Sensor Low Input (Bank 1 Sensor 1)
P0428Catalyst Temperature Sensor High Input (Bank 1 Sensor 1)
P0429Catalyst Heater Control Circuit (Bank 1)
P0430Catalyst System Efficiency Below Threshold (Bank 2)
P0431Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P0432Main Catalyst Efficiency Below Threshold (Bank 2)
P0433Heated Catalyst Efficiency Below Threshold (Bank 2)
P0434Heated Catalyst Temperature Below Threshold (Bank 2)
P0435Catalyst Temperature Sensor (Bank 2 Sensor 1)
P0436Catalyst Temperature Sensor Range/Performance (Bank 2 Sensor 1)
P0437Catalyst Temperature Sensor Low Input (Bank 2 Sensor 1)
P0438Catalyst Temperature Sensor High Input (Bank 2 Sensor 1)
P0439Catalyst Heater Control Circuit (Bank 2)
P0440Evaporative Emission Control System Malfunction
P0441Evaporative Emission Control System Incorrect Purge flow
P0442Evaporative Emission Control System leak Detected (small leak)
P0443Evaporative Emission Control System Purge Control Valve circuit Malfunction
P0444Evaporative Emission Control System Purge Control Valve Circuit Open
P0445Evaporative Emission Control System Purge Control Valve Circuit Shorted
P0446Evaporative Emission Control System Vent Control Circuit Malfunction
P0447Evaporative Emission Control System Vent Control Circuit Open
P0448Evaporative Emission Control System Vent Control Circuit Shorted
P0449Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
P0460Evaporative Emission Control System Pressure Sensor Malfunction
P0461Evaporative Emission Control System Pressure Sensor Range/Performance
P0462Evaporative Emission Control System Pressure Sensor Low Input
P0463Evaporative Emission Control System Pressure Sensor High Input
P0464Evaporative Emission Control System Pressure Sensor Intermittent
P0465Evaporative Emission Control System Tank Detected (gross leak)
P0466Evaporative Emission System Leak Detected (very small leak)
P0467Evaporative Emission System Leak Detected (fuel cap loose/off)
P0468Evaporative Emission System Purge Control Valve Circuit Low
P0469Evaporative Emission System Purge Control Valve Circuit High
P0460Fuel Level Sensor Circuit Malfunction
P0461Fuel Level Sensor Circuit Range/Performance
P0462Fuel Level Sensor Circuit Low Input
P0463Fuel Level Sensor Circuit High Input
P0464Fuel Level Sensor Circuit Intermittent
P0465Purge Flow Sensor Circuit Malfunction
P0466Purge Flow Sensor Circuit Range/Performance
P0467Purge Flow Sensor Circuit Low Input
P0468Purge Flow Sensor Circuit High Input
P0469Purge Flow Sensor Circuit Intermittent
P0470Exhaust Pressure Sensor Malfunction
P0471Exhaust Pressure Sensor Range/Performance
P0472Exhaust Pressure Sensor Low
P0473Exhaust Pressure Sensor High
P0474Exhaust Pressure Sensor Intermittent
P0475Exhaust Pressure Control Valve Malfunction
P0476Exhaust Pressure Control Valve Range/Performance
P0477Exhaust Pressure Control Valve Low
P0478Exhaust Pressure Control Valve High
P0479Exhaust Pressure Control Valve Intermittent
P0480Cooling Fan 1 Control Circuit Malfunction
P0481Cooling Fan 2 Control Circuit Malfunction
P0482Cooling Fan 3 Control Circuit Malfunction
P0483Cooling Fan Rationality Check Malfunction
P0484Cooling Fan Circuit Over Current
P0485Cooling Fan Power/Ground Circuit Malfunction
P0486Exhaust Gas Recirculation Sensor B Circuit
P0487Exhaust Gas Recirculation Throttle Position Control Circuit
P0488Exhaust Gas Recirculation Throttle Position Control Range/Performance
P0489Exhaust Gas Recirculation Control Circuit Low
P0490Exhaust Gas Recirculation Control Circuit Low
P0491Secondary Air Injection System (Bank 2)
P0492Secondary Air Injection System (Bank 2)
P0493Fan Overspeed (clutch locked)
P0494Fan Speed Low
P0495Fan Speed High
P0496Evaporative Emission System High Purge Flow
P0497Evaporative Emission System Low Purge Flow
P0498Evaporative Emission System Vent Control Circuit Low
P0499Evaporative Emission System Vent Control Circuit High