P04xx

200 generic powertrain codes in the P04xx range.Engine, transmission, fuel, ignition and emissions control.

16 of these have been through editorial review and carry full diagnostic guidance.

Codes in this range

P0400Exhaust Gas Recirculation Flow MalfunctionSeverity level 3 of 5: Diagnose soon.
P0401Exhaust Gas Recirculation Flow Insufficient DetectedSeverity level 3 of 5: Diagnose soon.
P0402Exhaust Gas Recirculation Flow Excessive DetectedSeverity level 3 of 5: Diagnose soon.
P0403EGR Control CircuitSeverity level 3 of 5: Diagnose soon.
P0404EGR Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P0405Exhaust Gas Recirculation Sensor "A" Circuit LowSeverity level 3 of 5: Diagnose soon.
P0406Exhaust Gas Recirculation Sensor "A" Circuit HighSeverity level 3 of 5: Diagnose soon.
P0407EGR Sensor B Circuit LowSeverity level 3 of 5: Diagnose soon.
P0408Exhaust Gas Recirculation Sensor "B" Circuit LowSeverity level 3 of 5: Diagnose soon.
P0409Exhaust Gas Recirculation Sensor "B" Circuit HighSeverity level 3 of 5: Diagnose soon.
P040AEGR Temperature Sensor A CircuitSeverity level 3 of 5: Diagnose soon.
P040BEGR Temperature Sensor A Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P040CEGR Temperature Sensor A Circuit LowSeverity level 3 of 5: Diagnose soon.
P040DEGR Temperature Sensor A Circuit HighSeverity level 3 of 5: Diagnose soon.
P040EEGR Temperature Sensor A Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P040FEGR Temperature Sensor A/B CorrelationSeverity level 3 of 5: Diagnose soon.
P0410Secondary Air Injection System MalfunctionSeverity level 3 of 5: Diagnose soon.
P0411Secondary Air Injection System Incorrect FlowSeverity level 3 of 5: Diagnose soon.
P0412Secondary Air Injection System Switching Valve A CircuitSeverity level 3 of 5: Diagnose soon.
P0413Secondary Air Injection System Switching Valve A Circuit OpenSeverity level 3 of 5: Diagnose soon.
P0414Secondary Air Injection System Switching Valve "A" Circuit ShortedSeverity level 3 of 5: Diagnose soon.
P0415Secondary Air Injection System Switching Valve B CircuitSeverity level 3 of 5: Diagnose soon.
P0416Secondary Air Injection System Switching Valve B Circuit OpenSeverity level 3 of 5: Diagnose soon.
P0417Secondary Air Injection System Switching Valve B Circuit ShortedSeverity level 3 of 5: Diagnose soon.
P0418Secondary Air Injection System Relay "A" Circuit MalfunctionSeverity level 3 of 5: Diagnose soon.
P0419Secondary Air Injection System Control B CircuitSeverity level 3 of 5: Diagnose soon.
P041AEGR Temperature Sensor B CircuitSeverity level 3 of 5: Diagnose soon.
P041BEGR Temperature Sensor B Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P041CEGR Temperature Sensor B Circuit LowSeverity level 3 of 5: Diagnose soon.
P041DEGR Temperature Sensor B Circuit HighSeverity level 3 of 5: Diagnose soon.
P041EEGR Temperature Sensor B Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P041FSecondary Air Injection System Switching Valve A Circuit LowSeverity level 3 of 5: Diagnose soon.
P0420Catalyst System Efficiency Below Threshold (Bank 1)Severity level 3 of 5: Diagnose soon.
P0421Warm Up Catalyst Efficiency Below Threshold (Bank 1)Severity level 3 of 5: Diagnose soon.
P0422Main Catalyst Efficiency Below Threshold (Bank 1)Severity level 3 of 5: Diagnose soon.
P0423Heated Catalyst Efficiency Below Threshold (Bank 1)Severity level 3 of 5: Diagnose soon.
P0424Heated Catalyst Temperature Below Threshold (Bank 1)Severity level 3 of 5: Diagnose soon.
P0425Catalyst Temperature Sensor (Bank 1, Sensor 1)Severity level 3 of 5: Diagnose soon.
P0426Catalyst Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0427Catalyst Temperature Sensor Circuit Low (Bank 1 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0428Catalyst Temperature Sensor Circuit High (Bank 1 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0429Catalyst Heater Control Circuit/Open (Bank 1)Severity level 3 of 5: Diagnose soon.
P042ACatalyst Temperature Sensor Circuit (Bank 1 Sensor 2)Severity level 3 of 5: Diagnose soon.
P042BCatalyst Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 2)Severity level 3 of 5: Diagnose soon.
P042CCatalyst Temperature Sensor Circuit Low (Bank 1 Sensor 2)Severity level 3 of 5: Diagnose soon.
P042DCatalyst Temperature Sensor Circuit High (Bank 1 Sensor 2)Severity level 3 of 5: Diagnose soon.
P042EEGR A Control Stuck OpenSeverity level 3 of 5: Diagnose soon.
P042FEGR A Control Stuck ClosedSeverity level 3 of 5: Diagnose soon.
P0430Catalyst System Efficiency Below Threshold (Bank 2)Severity level 3 of 5: Diagnose soon.
P0431Warm Up Catalyst Efficiency Below Threshold (Bank 2)Severity level 3 of 5: Diagnose soon.
P0432Main Catalyst Efficiency Below Threshold (Bank 2)Severity level 3 of 5: Diagnose soon.
P0433Heated Catalyst Efficiency Below Threshold (Bank 2)Severity level 3 of 5: Diagnose soon.
P0434Heated Catalyst Temperature Below Threshold (Bank 2)Severity level 3 of 5: Diagnose soon.
P0435Catalyst Temperature Sensor Circuit (Bank 2 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0436Catalyst Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0437Catalyst Temperature Sensor Circuit Low (Bank 2 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0438Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 1)Severity level 3 of 5: Diagnose soon.
P0439Catalyst Heater Control Circuit/Open (Bank 2)Severity level 3 of 5: Diagnose soon.
P043ACatalyst Temperature Sensor Circuit (Bank 2 Sensor 2)Severity level 3 of 5: Diagnose soon.
P043BCatalyst Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 2)Severity level 3 of 5: Diagnose soon.
P043CCatalyst Temperature Sensor Circuit Low (Bank 2 Sensor 2)Severity level 3 of 5: Diagnose soon.
P043DCatalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)Severity level 3 of 5: Diagnose soon.
P043EEVAP System Leak Detection Reference Orifice Low FlowSeverity level 3 of 5: Diagnose soon.
P043FEVAP System Leak Detection Reference Orifice High FlowSeverity level 3 of 5: Diagnose soon.
P0440Evaporative Emission Control System MalfunctionSeverity level 3 of 5: Diagnose soon.
P0441Evaporative Emission System Incorrect Purge FlowSeverity level 3 of 5: Diagnose soon.
P0442Evaporative Emission System Leak Detected (Small Leak)Severity level 2 of 5: Not urgent.
P0443Evaporative Emission System Purge Control Valve CircuitSeverity level 3 of 5: Diagnose soon.
P0444Evaporative Emission Purge Control Valve Circuit OpenSeverity level 3 of 5: Diagnose soon.
P0445Evaporative Emission System Purge Control Valve Circuit ShortedSeverity level 3 of 5: Diagnose soon.
P0446Evaporative Emission Vent Control Circuit MalfunctionSeverity level 3 of 5: Diagnose soon.
P0447Evaporative Emission System Vent Control Circuit OpenSeverity level 3 of 5: Diagnose soon.
P0448EVAP System Vent Control Circuit ShortedSeverity level 3 of 5: Diagnose soon.
P0449Evaporative Emission System Vent Valve/Solenoid Circuit MalfunctionSeverity level 3 of 5: Diagnose soon.
P044AEGR Sensor C CircuitSeverity level 3 of 5: Diagnose soon.
P044BEGR Sensor C Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P044CEGR Sensor C Circuit LowSeverity level 3 of 5: Diagnose soon.
P044DEGR Sensor C Circuit HighSeverity level 3 of 5: Diagnose soon.
P044EEGR Sensor C Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P044FSecondary Air Injection System Switching Valve A Circuit HighSeverity level 3 of 5: Diagnose soon.
P0450EVAP System Pressure Sensor/Switch A CircuitSeverity level 3 of 5: Diagnose soon.
P0451Evaporative Emission System Pressure Sensor Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P0452Evaporative Emission System Pressure Sensor Low InputSeverity level 3 of 5: Diagnose soon.
P0453Evaporative Emission System Pressure Sensor High InputSeverity level 3 of 5: Diagnose soon.
P0454EVAP System Pressure Sensor/Switch A Circuit IntermittentSeverity level 3 of 5: Diagnose soon.
P0455Evaporative Emission System Leak Detected (Large Leak)Severity level 2 of 5: Not urgent.
P0456Evaporative Emission System Leak Detected (Very Small Leak)Severity level 2 of 5: Not urgent.
P0457Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)Severity level 3 of 5: Diagnose soon.
P0458EVAP System Purge Control Valve A Circuit LowSeverity level 3 of 5: Diagnose soon.
P0459EVAP System Purge Control Valve A Circuit HighSeverity level 3 of 5: Diagnose soon.
P045AEGR B Control CircuitSeverity level 3 of 5: Diagnose soon.
P045BEGR B Control Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P045CEGR B Control Circuit LowSeverity level 3 of 5: Diagnose soon.
P045DEGR B Control Circuit HighSeverity level 3 of 5: Diagnose soon.
P045EEGR B Control Stuck OpenSeverity level 3 of 5: Diagnose soon.
P045FEGR B Control Stuck ClosedSeverity level 3 of 5: Diagnose soon.
P0460Fuel Level Sensor A CircuitSeverity level 2 of 5: Not urgent.
P0461Fuel Level Sensor A Circuit Range/PerformanceSeverity level 2 of 5: Not urgent.
P0462Fuel Level Sensor A Circuit LowSeverity level 2 of 5: Not urgent.
P0463Fuel Level Sensor A Circuit HighSeverity level 2 of 5: Not urgent.
P0464Fuel Level Sensor A Circuit IntermittentSeverity level 2 of 5: Not urgent.
P0465EVAP Purge Flow Sensor CircuitSeverity level 3 of 5: Diagnose soon.
P0466EVAP Purge Flow Sensor Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P0467EVAP Purge Flow Sensor Circuit LowSeverity level 3 of 5: Diagnose soon.
P0468EVAP Purge Flow Sensor Circuit HighSeverity level 3 of 5: Diagnose soon.
P0469EVAP Purge Flow Sensor Circuit IntermittentSeverity level 3 of 5: Diagnose soon.
P046ACatalyst Temperature Sensor 1/2 Correlation (Bank 1)Severity level 3 of 5: Diagnose soon.
P046BCatalyst Temperature Sensor 1/2 Correlation (Bank 2)Severity level 3 of 5: Diagnose soon.
P046CEGR Sensor A Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P046DEGR Sensor A Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P046EEGR Sensor B Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P046FEGR Sensor B Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P0470Exhaust Pressure Sensor A CircuitSeverity level 3 of 5: Diagnose soon.
P0471Exhaust Pressure Sensor A Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P0472Exhaust Pressure Sensor A Circuit LowSeverity level 3 of 5: Diagnose soon.
P0473Exhaust Pressure Sensor A Circuit HighSeverity level 3 of 5: Diagnose soon.
P0474Exhaust Pressure Sensor A Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P0475Exhaust Pressure Control Valve ASeverity level 3 of 5: Diagnose soon.
P0476Exhaust Pressure Control Valve A Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P0477Exhaust Pressure Control Valve A LowSeverity level 3 of 5: Diagnose soon.
P0478Exhaust Pressure Control Valve A HighSeverity level 3 of 5: Diagnose soon.
P0479Exhaust Pressure Control Valve A IntermittentSeverity level 3 of 5: Diagnose soon.
P047AExhaust Pressure Sensor B CircuitSeverity level 3 of 5: Diagnose soon.
P047BExhaust Pressure Sensor B Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P047CExhaust Pressure Sensor B Circuit LowSeverity level 3 of 5: Diagnose soon.
P047DExhaust Pressure Sensor B Circuit HighSeverity level 3 of 5: Diagnose soon.
P047EExhaust Pressure Sensor B Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P047FExhaust Pressure Control Valve A Stuck OpenSeverity level 3 of 5: Diagnose soon.
P0480Cooling Fan 1 Control CircuitSeverity level 3 of 5: Diagnose soon.
P0481Cooling Fan 2 Control CircuitSeverity level 3 of 5: Diagnose soon.
P0482Cooling Fan 3 Control Circuit MalfunctionSeverity level 3 of 5: Diagnose soon.
P0483Cooling Fan Rationality CheckSeverity level 3 of 5: Diagnose soon.
P0484Cooling Fan Current Too HighSeverity level 3 of 5: Diagnose soon.
P0485Cooling Fan Power/Ground CircuitSeverity level 3 of 5: Diagnose soon.
P0486EGR Sensor B CircuitSeverity level 3 of 5: Diagnose soon.
P0487EGR Throttle Control Circuit A/OpenSeverity level 3 of 5: Diagnose soon.
P0488EGR Throttle Control Circuit A Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P0489EGR A Control Circuit LowSeverity level 3 of 5: Diagnose soon.
P048AExhaust Pressure Control Valve A Stuck ClosedSeverity level 4 of 5: Get it looked at now.
P048BExhaust Pressure Control Valve A Position Sensor/Switch CircuitSeverity level 3 of 5: Diagnose soon.
P048CExhaust Pressure Control Valve A Position Sensor/Switch Circuit Range/PerformanceSeverity level 3 of 5: Diagnose soon.
P048DExhaust Pressure Control Valve A Position Sensor/Switch Circuit LowSeverity level 3 of 5: Diagnose soon.
P048EExhaust Pressure Control Valve A Position Sensor/Switch Circuit HighSeverity level 3 of 5: Diagnose soon.
P048FExhaust Pressure Control Valve A Position Sensor/Switch Circuit Intermittent/ErraticSeverity level 3 of 5: Diagnose soon.
P0490EGR A Control Circuit HighSeverity level 3 of 5: Diagnose soon.
P0491Secondary Air Injection System Insufficient Flow (Bank 1)Severity level 3 of 5: Diagnose soon.
P0492Secondary Air Injection System Insufficient Flow (Bank 2)Severity level 3 of 5: Diagnose soon.
P0493Fan OverspeedSeverity level 3 of 5: Diagnose soon.
P0494Fan 1 UnderspeedSeverity level 3 of 5: Diagnose soon.
P0495Fan 1 OverspeedSeverity level 3 of 5: Diagnose soon.
P0496Evaporative Emission System High Purge FlowSeverity level 3 of 5: Diagnose soon.
P0497EVAP System Low Purge FlowSeverity level 3 of 5: Diagnose soon.
P0498EVAP System Vent Valve Control Circuit LowSeverity level 3 of 5: Diagnose soon.
P0499EVAP System Vent Valve Control Circuit HighSeverity level 3 of 5: Diagnose soon.
P049AEGR B FlowSeverity level 3 of 5: Diagnose soon.
P049BEGR B Flow Insufficient DetectedSeverity level 3 of 5: Diagnose soon.
P049CEGR B Flow Excessive DetectedSeverity level 3 of 5: Diagnose soon.
P049DEGR A Control Position Exceeded Learning LimitSeverity level 3 of 5: Diagnose soon.
P049EEGR B Control Position Exceeded Learning LimitSeverity level 3 of 5: Diagnose soon.
P049FExhaust Pressure Control Valve BSeverity level 3 of 5: Diagnose soon.
P04A0Exhaust Pressure Control Valve B Range or PerformanceSeverity level 3 of 5: Diagnose soon.
P04A1Exhaust Pressure Control Valve B LowSeverity level 3 of 5: Diagnose soon.
P04A2Exhaust Pressure Control Valve B HighSeverity level 3 of 5: Diagnose soon.
P04A3Exhaust Pressure Control Valve B IntermittentSeverity level 3 of 5: Diagnose soon.
P04A4Exhaust Pressure Control Valve B Stuck OpenSeverity level 3 of 5: Diagnose soon.
P04A5Exhaust Pressure Control Valve B Stuck ClosedSeverity level 3 of 5: Diagnose soon.
P04A6Exhaust Pressure Control Valve B Position Sensor CircuitSeverity level 3 of 5: Diagnose soon.
P04A7Exhaust Pressure Control Valve B Position Sensor Circuit Range or PerformanceSeverity level 3 of 5: Diagnose soon.
P04A8Exhaust Pressure Control Valve B Position Sensor Circuit LowSeverity level 3 of 5: Diagnose soon.
P04A9Exhaust Pressure Control Valve B Position Sensor Circuit HighSeverity level 3 of 5: Diagnose soon.
P04AAExhaust Pressure Control Valve B Position Sensor Circuit Intermittent or ErraticSeverity level 3 of 5: Diagnose soon.
P04ABEVAP System Purge Control Valve B Circuit OpenSeverity level 3 of 5: Diagnose soon.
P04ACEVAP System Purge Control Valve B Circuit LowSeverity level 3 of 5: Diagnose soon.
P04ADEVAP System Purge Control Valve B Circuit HighSeverity level 3 of 5: Diagnose soon.
P04AEEVAP System Purge Control Valve B Performance Stuck OpenSeverity level 3 of 5: Diagnose soon.
P04AFEVAP System Purge Control Valve B Stuck ClosedSeverity level 3 of 5: Diagnose soon.
P04B0Refueling Vapor Control Valve Circuit OpenSeverity level 3 of 5: Diagnose soon.
P04B1Refueling Vapor Control Valve Circuit LowSeverity level 3 of 5: Diagnose soon.
P04B2Refueling Vapor Control Valve Circuit HighSeverity level 3 of 5: Diagnose soon.
P04B3Refueling Vapor Control Valve Performance Stuck OpenSeverity level 3 of 5: Diagnose soon.
P04B4Refueling Vapor Control Valve Stuck ClosedSeverity level 3 of 5: Diagnose soon.
P04B5Fuel Fill Door Stuck OpenSeverity level 2 of 5: Not urgent.
P04B6Fuel Fill Door Stuck ClosedSeverity level 2 of 5: Not urgent.
P04B7Fuel Fill Door Position Sensor Circuit Intermittent or ErraticSeverity level 2 of 5: Not urgent.
P04B8Fuel Fill Door Position Sensor CircuitSeverity level 2 of 5: Not urgent.
P04B9Fuel Fill Door Position Sensor Circuit LowSeverity level 2 of 5: Not urgent.
P04BAFuel Fill Door Position Sensor Circuit HighSeverity level 2 of 5: Not urgent.
P04BBFuel Fill Door Lock Control Circuit OpenSeverity level 2 of 5: Not urgent.
P04BCFuel Fill Door Lock Control Range or PerformanceSeverity level 2 of 5: Not urgent.
P04BDFuel Fill Door Lock Control Circuit LowSeverity level 2 of 5: Not urgent.
P04BEFuel Fill Door Lock Control Circuit HighSeverity level 2 of 5: Not urgent.
P04BFFuel Fill Door Unlock Control Circuit OpenSeverity level 2 of 5: Not urgent.
P04C0Fuel Fill Door Unlock Control Range or PerformanceSeverity level 2 of 5: Not urgent.
P04C1Fuel Fill Door Unlock Control Circuit LowSeverity level 2 of 5: Not urgent.
P04C2Fuel Fill Door Unlock Control Circuit HighSeverity level 2 of 5: Not urgent.
P04C3Fuel Fill Door Lock Position Sensor CircuitSeverity level 2 of 5: Not urgent.
P04C4Fuel Fill Door Lock Position Sensor Circuit Range or PerformanceSeverity level 2 of 5: Not urgent.
P04C5Fuel Fill Door Lock Position Sensor Circuit LowSeverity level 2 of 5: Not urgent.
P04C6Fuel Fill Door Lock Position Sensor Circuit HighSeverity level 2 of 5: Not urgent.
P04C7Fuel Fill Door Lock Position Sensor Circuit Intermittent or ErraticSeverity level 2 of 5: Not urgent.