P04xx fault codes
256 generic codes from P0400 to P04FF, with what each means.
- P0400 Exhaust Gas Recirculation Flow Malfunction
- P0401 Exhaust Gas Recirculation Flow Insufficient Detected
- P0402 Exhaust Gas Recirculation Flow Excessive Detected
- P0403 Exhaust Gas Recirculation A Control Circuit/Open
- P0404 Exhaust Gas Recirculation A Control Circuit Range/Performance
- P0405 Exhaust Gas Recirculation Sensor A Circuit Low
- P0406 Exhaust Gas Recirculation Sensor A Circuit High
- P0407 Exhaust Gas Recirculation Sensor B Circuit Low
- P0408 Exhaust Gas Recirculation Sensor B Circuit High
- P0409 Exhaust Gas Recirculation Sensor A Circuit
- P040A EGR Temperature Sensor A Circuit
- P040B EGR Temperature Sensor A Circuit Range/Performance
- P040C EGR Temperature Sensor A Circuit Low
- P040D EGR Temperature Sensor A Circuit High
- P040E EGR Temperature Sensor A Circuit Intermittent/Erratic
- P040F EGR Temperature Sensor A/B Correlation
- P0410 AIR System A
- P0411 AIR System A Incorrect Flow Detected
- P0412 AIR System Switching Valve A Circuit
- P0413 AIR System Switching Valve A Circuit Open
- P0414 AIR System Switching Valve A Circuit Shorted
- P0415 AIR System Switching Valve B Circuit
- P0416 AIR System Switching Valve B Circuit Open
- P0417 AIR System Switching Valve B Circuit Shorted
- P0418 Secondary Air Injection System Control A Circuit
- P0419 Secondary Air Injection System Control B Circuit
- P041A EGR Temperature Sensor B Circuit
- P041B EGR Temperature Sensor B Circuit Range/Performance
- P041C EGR Temperature Sensor B Circuit Low
- P041D EGR Temperature Sensor B Circuit High
- P041E EGR Temperature Sensor B Circuit Intermittent/Erratic
- P041F Secondary Air Injection System Switching Valve A Circuit Low
- P0420 Catalyst System Efficiency Below Threshold (Bank 1)
- P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
- P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
- P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
- P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
- P0425 Catalyst Temperature Sensor (Bank 1, Sensor 1)
- P0426 Catalyst Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 1)
- P0427 Catalyst Temperature Sensor Circuit Low (Bank 1 Sensor 1)
- P0428 Catalyst Temperature Sensor Circuit High (Bank 1 Sensor 1)
- P0429 Catalyst Heater Control Circuit (Bank 1)
- P042A Catalyst Temperature Sensor Circuit (Bank 1 Sensor 2)
- P042B Catalyst Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 2)
- P042C Catalyst Temperature Sensor Circuit Low (Bank 1 Sensor 2)
- P042D Catalyst Temperature Sensor Circuit High (Bank 1 Sensor 2)
- P042E EGR A Control Stuck Open
- P042F EGR A Control Stuck Closed
- P0430 Catalyst System Efficiency Below Threshold (Bank 2)
- P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
- P0432 Main Catalyst Efficiency Below Threshold (Bank 2)
- P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
- P0434 Heated Catalyst Temperature Below Threshold (Bank 2)
- P0435 Catalyst Temperature Sensor Circuit (Bank 2 Sensor 1)
- P0436 Catalyst Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 1)
- P0437 Catalyst Temperature Sensor Circuit Low (Bank 2 Sensor 1)
- P0438 Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 1)
- P0439 Catalyst Heater Control Circuit (Bank 2)
- P043A Catalyst Temperature Sensor Circuit (Bank 2 Sensor 2)
- P043B Catalyst Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 2)
- P043C Catalyst Temperature Sensor Circuit Low (Bank 2 Sensor 2)
- P043D Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)
- P043E EVAP System Leak Detection Reference Orifice Low Flow
- P043F EVAP System Leak Detection Reference Orifice High Flow
- P0440 Evaporative Emission Control System Malfunction
- P0441 Evaporative Emission System Incorrect Purge Flow
- P0442 Evaporative Emission System Leak Detected (Small Leak)
- P0443 Evaporative Emission System Purge Control Valve Circuit
- P0444 Evaporative Emission Purge Control Valve Circuit Open
- P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
- P0446 Evaporative Emission Vent Control Circuit Malfunction
- P0447 Evaporative Emission System Vent Control Circuit Open
- P0448 EVAP System Vent Control Circuit Shorted
- P0449 Evaporative Emission System Vent Valve/Solenoid Circuit Malfunction
- P044A EGR Sensor C Circuit
- P044B EGR Sensor C Circuit Range/Performance
- P044C EGR Sensor C Circuit Low
- P044D EGR Sensor C Circuit High
- P044E EGR Sensor C Circuit Intermittent/Erratic
- P044F Secondary Air Injection System Switching Valve A Circuit High
- P0450 EVAP System Pressure Sensor/Switch A Circuit
- P0451 Evaporative Emission System Pressure Sensor Range/Performance
- P0452 Evaporative Emission System Pressure Sensor Low Input
- P0453 Evaporative Emission System Pressure Sensor High Input
- P0454 EVAP System Pressure Sensor/Switch A Circuit Intermittent
- P0455 Evaporative Emission System Leak Detected (Large Leak)
- P0456 Evaporative Emission System Leak Detected (Very Small Leak)
- P0457 Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
- P0458 Evaporative Emission System Purge Control Valve Circuit Low
- P0459 Evaporative Emission System Purge Control Valve Circuit High
- P045A EGR B Control Circuit
- P045B EGR B Control Circuit Range/Performance
- P045C EGR B Control Circuit Low
- P045D EGR B Control Circuit High
- P045E EGR B Control Stuck Open
- P045F EGR B Control Stuck Closed
- P0460 Fuel Level Sensor A Circuit
- P0461 Fuel Level Sensor A Circuit Range/Performance
- P0462 Fuel Level Sensor A Circuit Low
- P0463 Fuel Level Sensor A Circuit High
- P0464 Fuel Level Sensor A Circuit Intermittent
- P0465 EVAP Purge Flow Sensor Circuit
- P0466 EVAP Purge Flow Sensor Circuit Range/Performance
- P0467 EVAP Purge Flow Sensor Circuit Low
- P0468 EVAP Purge Flow Sensor Circuit High
- P0469 EVAP Purge Flow Sensor Circuit Intermittent
- P046A Catalyst Temperature Sensor 1/2 Correlation (Bank 1)
- P046B Catalyst Temperature Sensor 1/2 Correlation (Bank 2)
- P046C EGR Sensor A Circuit Range/Performance
- P046D EGR Sensor A Circuit Intermittent/Erratic
- P046E EGR Sensor B Circuit Range/Performance
- P046F EGR Sensor B Circuit Intermittent/Erratic
- P0470 Exhaust Pressure Sensor A Circuit
- P0471 Exhaust Pressure Sensor A Circuit Range/Performance
- P0472 Exhaust Pressure Sensor A Circuit Low
- P0473 Exhaust Pressure Sensor A Circuit High
- P0474 Exhaust Pressure Sensor A Circuit Intermittent/Erratic
- P0475 Exhaust Pressure Control Valve A
- P0476 Exhaust Pressure Control Valve A Range/Performance
- P0477 Exhaust Pressure Control Valve A Low
- P0478 Exhaust Pressure Control Valve A High
- P0479 Exhaust Pressure Control Valve A Intermittent
- P047A Exhaust Pressure Sensor B Circuit
- P047B Exhaust Pressure Sensor B Circuit Range/Performance
- P047C Exhaust Pressure Sensor B Circuit Low
- P047D Exhaust Pressure Sensor B Circuit High
- P047E Exhaust Pressure Sensor B Circuit Intermittent/Erratic
- P047F Exhaust Pressure Control Valve A Stuck Open
- P0480 Fan 1 Control Circuit
- P0481 Fan 2 Control Circuit
- P0482 Fan 3 Control Circuit
- P0483 Cooling Fan Rationality Check
- P0484 Cooling Fan Circuit Over Current
- P0485 Fan Power/Ground Circuit
- P0486 EGR Sensor B Circuit
- P0487 Exhaust Gas Recirculation Throttle Control Circuit/Open
- P0488 Exhaust Gas Recirculation Throttle Control Range/Performance
- P0489 Exhaust Gas Recirculation A Control Circuit Low
- P048A Exhaust Pressure Control Valve A Stuck Closed
- P048B Exhaust Pressure Control Valve A Position Sensor/Switch Circuit
- P048C Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Range/Performance
- P048D Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Low
- P048E Exhaust Pressure Control Valve A Position Sensor/Switch Circuit High
- P048F Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Intermittent/Erratic
- P0490 Exhaust Gas Recirculation A Control Circuit High
- P0491 Secondary Air Injection System Insufficient Flow (Bank 1)
- P0492 Secondary Air Injection System Insufficient Flow (Bank 2)
- P0493 Fan Overspeed
- P0494 Fan 1 Underspeed
- P0495 Fan 1 Overspeed
- P0496 Evaporative Emission System High Purge Flow
- P0497 EVAP System Low Purge Flow
- P0498 EVAP System Vent Valve Control Circuit Low
- P0499 EVAP System Vent Valve Control Circuit High
- P049A EGR B Flow
- P049B EGR B Flow Insufficient Detected
- P049C EGR B Flow Excessive Detected
- P049D EGR A Control Position Exceeded Learning Limit
- P049E EGR B Control Position Exceeded Learning Limit
- P049F Exhaust Pressure Control Valve B
- P04A0 Exhaust Pressure Control Valve B Range/Performance
- P04A1 Exhaust Pressure Control Valve B Low
- P04A2 Exhaust Pressure Control Valve B High
- P04A3 Exhaust Pressure Control Valve B Intermittent
- P04A4 Exhaust Pressure Control Valve B Stuck Open
- P04A5 Exhaust Pressure Control Valve B Stuck Closed
- P04A6 Exhaust Pressure Control Valve B Position Sensor/Switch Circuit
- P04A7 Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Range/Performance
- P04A8 Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Low
- P04A9 Exhaust Pressure Control Valve B Position Sensor/Switch Circuit High
- P04AA Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Intermittent/Erratic
- P04AB EVAP System Purge Control Valve B Circuit/Open
- P04AC EVAP System Purge Control Valve B Circuit Low
- P04AD EVAP System Purge Control Valve B Circuit High
- P04AE EVAP System Purge Control Valve B Performance/Stuck Open
- P04AF EVAP System Purge Control Valve B Stuck Closed
- P04B0 Refueling Vapor Control Valve Circuit/Open
- P04B1 Refueling Vapor Control Valve Circuit Low
- P04B2 Refueling Vapor Control Valve Circuit High
- P04B3 Refueling Vapor Control Valve Stuck Performance/Stuck Open
- P04B4 Refueling Vapor Control Valve Stuck Closed
- P04B5 Fuel Fill Door Stuck Open
- P04B6 Fuel Fill Door Stuck Closed
- P04B7 Fuel Fill Door Position Sensor Circuit Intermittent or Erratic
- P04B8 Fuel Fill Door Position Sensor Circuit
- P04B9 Fuel Fill Door Position Sensor Circuit Low
- P04BA Fuel Fill Door Position Sensor Circuit High
- P04BB Fuel Fill Door Lock Control Circuit Open
- P04BC Fuel Fill Door Lock Control Range or Performance
- P04BD Fuel Fill Door Lock Control Circuit Low
- P04BE Fuel Fill Door Lock Control Circuit High
- P04BF Fuel Fill Door Unlock Control Circuit Open
- P04C0 Fuel Fill Door Unlock Control Range or Performance
- P04C1 Fuel Fill Door Unlock Control Circuit Low
- P04C2 Fuel Fill Door Unlock Control Circuit High
- P04C3 Fuel Fill Door Lock Position Sensor Circuit
- P04C4 Fuel Fill Door Lock Position Sensor Circuit Range or Performance
- P04C5 Fuel Fill Door Lock Position Sensor Circuit Low
- P04C6 Fuel Fill Door Lock Position Sensor Circuit High
- P04C7 Fuel Fill Door Lock Position Sensor Circuit Intermittent or Erratic
- P04C8 Fuel Fill Door Open Request Sensor or Switch Circuit
- P04C9 Fuel Fill Door Open Request Performance Stuck Off
- P04CA Fuel Fill Door Open Request Sensor or Switch Circuit Low
- P04CB Fuel Fill Door Open Request Sensor or Switch Circuit High
- P04CC Fuel Fill Door Open Request Sensor or Switch Circuit Intermittent or Erratic
- P04CD Fuel Fill Door Open Request Sensor or Switch Stuck On
- P04CE EGR Temperature Sensor C Circuit
- P04CF EGR Temperature Sensor C Circuit Range or Performance
- P04D0 EGR Temperature Sensor C Circuit Low
- P04D1 EGR Temperature Sensor C Circuit High
- P04D2 EGR Temperature Sensor C Circuit Intermittent or Erratic
- P04D3 Exhaust Brake Input Circuit
- P04D4 Exhaust Brake Input Circuit Range or Performance
- P04D5 Exhaust Brake Input Circuit Low
- P04D6 Exhaust Brake Input Circuit High
- P04D7 Exhaust Brake Input Circuit Intermittent or Erratic
- P04D8 Excessive Time To Enter Closed Loop EGR Control
- P04D9 Closed Loop EGR Control At Limit Flow Too Low
- P04DA Closed Loop EGR Control At Limit Flow Too High
- P04DB Crankcase Ventilation System Disconnected
- P04DC Fuel Fill Door Position Sensor Circuit Range or Performance
- P04DD Cold Start EGR A Flow Insufficient Detected
- P04DE Cold Start EGR A Flow Excessive Detected
- P04DF EVAP System Purge Control Valve A Performance
- P04E0 EVAP System Purge Control Valve A Stuck Closed
- P04E1 Crankcase Ventilation Hose Connection Sensor Circuit
- P04E2 Crankcase Ventilation Hose Connection Sensor Circuit Low
- P04E3 Crankcase Ventilation Hose Connection Sensor Circuit High
- P04E4 Crankcase Ventilation Hose Connection Sensor Circuit Intermittent or Erratic
- P04E5 EGR Temperature Sensor D Circuit
- P04E6 EGR Temperature Sensor D Circuit Range or Performance
- P04E7 EGR Temperature Sensor D Circuit Low
- P04E8 EGR Temperature Sensor D Circuit High
- P04E9 EGR Temperature Sensor D Circuit Intermittent or Erratic
- P04EA EVAP System Small Leak Detected Fuel Tank Side
- P04EB EVAP System Small Leak Detected Fresh Air Side
- P04EC EVAP System Large Leak Detected Fuel Tank Side
- P04ED EVAP System Large Leak Detected Fresh Air Side
- P04EE EVAP System Very Small Leak Detected Fuel Tank Side
- P04EF EVAP System Very Small Leak Detected Fresh Air Side
- P04F0 EVAP System High Load Purge Line A Performance
- P04F1 EVAP System Purge Line Performance
- P04F2 Catalyst Heater Supply Voltage Bank 1
- P04F3 Catalyst Heater Supply Voltage Bank 2
- P04F4 Catalyst Heater Circuit Low Bank 1
- P04F5 Catalyst Heater Circuit Low Bank 2
- P04F6 Catalyst Heater Circuit High Bank 1
- P04F7 Catalyst Heater Circuit High Bank 2
- P04F8 Catalyst Heater Circuit Intermittent Bank 1
- P04F9 Catalyst Heater Circuit Intermittent Bank 2
- P04FA EGR A Control Temperature Too High
- P04FB Crankcase Ventilation Hose Connection Sensor Range or Performance
- P04FC Crankcase Ventilation System Performance
- P04FD EGR Actuator A Control Processor Performance
- P04FE Catalyst Heater Circuit Performance Bank 1
- P04FF Catalyst Heater Circuit Performance Bank 2