Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 31 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P209C | Reductant Injection Air Pressure Sensor B Circuit Low | Fuel Injection | Medium |
| P209D | Reductant Injection Air Pressure Sensor B Circuit High | Fuel Injection | Medium |
| P209E | Reductant Injection Air Pressure Sensor A/B Correlation | Fuel Injection | Medium |
| P209F | Reductant Tank Heater Control Circuit Performance | Fuel Injection | Medium |
| P20A0 | Reductant Purge Control Valve A Circuit /Open | Fuel Metering | Medium |
| P20A1 | Reductant Purge Control Valve A Performance | Fuel Metering | Medium |
| P20A2 | Reductant Purge Control Valve A Circuit Low | Fuel Metering | Medium |
| P20A3 | Reductant Purge Control Valve A Circuit High | Fuel Metering | Medium |
| P20A4 | Reductant Purge Control Valve A Stuck Open | Fuel Metering | Medium |
| P20A5 | Reductant Purge Control Valve A Stuck Closed | Fuel Metering | Medium |
| P20A6 | Reductant Injection Air Pressure Control Valve Circuit/Open | Fuel Metering | Medium |
| P20A7 | Reductant Injection Air Pressure Control Valve Performance | Fuel Metering | Medium |
| P20A8 | Reductant Injection Air Pressure Control Valve Circuit Low | Fuel Metering | Medium |
| P20A9 | Reductant Injection Air Pressure Control Valve Circuit High | Fuel Metering | Medium |
| P20AA | Reductant Injection Air Pressure Control Valve Stuck Open | Fuel Metering | Medium |
| P20AB | Reductant Injection Air Pressure Control Valve Stuck Closed | Fuel Metering | Medium |
| P20AC | Reductant Metering Unit Temperature Sensor Circuit | Fuel Metering | Medium |
| P20AD | Reductant Metering Unit Temperature Sensor Circuit Range/Performance | Fuel Metering | Medium |
| P20AE | Reductant Metering Unit Temperature Sensor Circuit Low | Fuel Metering | Medium |
| P20AF | Reductant Metering Unit Temperature Sensor Circuit High | Fuel Metering | Medium |
| P20B0 | Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P20B1 | Reductant Heater Coolant Control Valve Circuit/Open | Fuel Metering | Medium |
| P20B2 | Reductant Heater Coolant Control Valve Performance/Stuck Open | Fuel Metering | Medium |
| P20B3 | Reductant Heater Coolant Control Valve Circuit Low | Fuel Metering | Medium |
| P20B4 | Reductant Heater Coolant Control Valve Circuit High | Fuel Metering | Medium |
| P20B5 | Reductant Metering Unit Heater Control Circuit/Open | Fuel Metering | Medium |
| P20B6 | Reductant Metering Unit Heater Control Circuit Performance | Fuel Metering | Medium |
| P20B7 | Reductant Metering Unit Heater Control Circuit Low | Fuel Metering | Medium |
| P20B8 | Reductant Metering Unit Heater Control Circuit High | Fuel Metering | Medium |
| P20B9 | Reductant Heater A Control Circuit/Open | Fuel Metering | Medium |
| P20BA | Reductant Heater A Control Circuit Performance | Fuel Metering | Medium |
| P20BB | Reductant Heater A Control Circuit Low | Fuel Metering | Medium |
| P20BC | Reductant Heater A Control Circuit High | Fuel Metering | Medium |
| P20BD | Reductant Heater B Control Circuit/Open | Fuel Metering | Medium |
| P20BE | Reductant Heater B Control Circuit Performance | Fuel Metering | Medium |
| P20BF | Reductant Heater B Control Circuit Low | Fuel Metering | Medium |
| P20C0 | Reductant Heater B Control Circuit High | Fuel Metering | Medium |
| P20C1 | Reductant Heater C Control Circuit/Open | Fuel Metering | Medium |
| P20C2 | Reductant Heater C Control Circuit Performance | Fuel Metering | Medium |
| P20C3 | Reductant Heater C Control Circuit Low | Fuel Metering | Medium |
| P20C4 | Reductant Heater C Control Circuit High | Fuel Metering | Medium |
| P20C5 | Reductant Heater D Control Circuit/Open | Fuel Metering | Medium |
| P20C6 | Reductant Heater D Control Circuit Performance | Fuel Metering | Medium |
| P20C7 | Reductant Heater D Control Circuit Low | Fuel Metering | Medium |
| P20C8 | Reductant Heater D Control Circuit High | Fuel Metering | Medium |
| P20C9 | Reductant Control Module Requested MIL Illumination | Fuel Metering | Medium |
| P20CA | Reductant Injection Air Pressure Leakage | Fuel Metering | Medium |
| P20CB | Exhaust Aftertreatment Fuel Injector A Control Circuit/Open | Fuel Metering | Medium |
| P20CC | Exhaust Aftertreatment Fuel Injector A Control Performance | Fuel Metering | Medium |
| P20CD | Exhaust Aftertreatment Fuel Injector A Control Circuit Low | Fuel Metering | Medium |
| P20CE | Exhaust Aftertreatment Fuel Injector A Control Circuit High | Fuel Metering | Medium |
| P20CF | Exhaust Aftertreatment Fuel Injector A Stuck Open | Fuel Metering | Medium |
| P20D0 | Exhaust Aftertreatment Fuel Injector A Stuck Closed | Fuel Metering | Medium |
| P20D1 | Exhaust Aftertreatment Fuel Injector B Control Circuit/Open | Fuel Metering | Medium |
| P20D2 | Exhaust Aftertreatment Fuel Injector B Control Performance | Fuel Metering | Medium |
| P20D3 | Exhaust Aftertreatment Fuel Injector B Control Circuit Low | Fuel Metering | Medium |
| P20D4 | Exhaust Aftertreatment Fuel Injector B Control Circuit High | Fuel Metering | Medium |
| P20D5 | Exhaust Aftertreatment Fuel Injector B Stuck Open | Fuel Metering | Medium |
| P20D6 | Exhaust Aftertreatment Fuel Injector B Stuck Closed | Fuel Metering | Medium |
| P20D7 | Exhaust Aftertreatment Fuel Supply Control Circuit/Open | Fuel Metering | Medium |
| P20D8 | Exhaust Aftertreatment Fuel Supply Control Performance | Fuel Metering | Medium |
| P20D9 | Exhaust Aftertreatment Fuel Supply Control Circuit Low | Fuel Metering | Medium |
| P20DA | Exhaust Aftertreatment Fuel Supply Control Circuit High | Fuel Metering | Medium |
| P20DB | Exhaust Aftertreatment Fuel Supply Control Stuck Open | Fuel Metering | Medium |
| P20DC | Exhaust Aftertreatment Fuel Supply Control Stuck Closed | Fuel Metering | Medium |
| P20DD | Exhaust Aftertreatment Fuel Pressure Sensor Circuit | Fuel Metering | Medium |
| P20DE | Exhaust Aftertreatment Fuel Pressure Sensor Circuit Range/Performance | Fuel Metering | Medium |
| P20DF | Exhaust Aftertreatment Fuel Pressure Sensor Circuit Low | Fuel Metering | Medium |
| P20E0 | Exhaust Aftertreatment Fuel Pressure Sensor Circuit High | Fuel Metering | Medium |
| P20E1 | Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P20EA | Reductant Control Module Power Relay De-Energized Performance - Too Early | Fuel Metering | Medium |
| P20EB | Reductant Control Module Power Relay De-Energized Performance - Too Late | Fuel Metering | Medium |
| P20EC | SCR NOx Catalyst - Over Temperature Bank 1 | Fuel Metering | Medium |
| P20ED | SCR NOx Pre-Catalyst - Over Temperature Bank 1 | Fuel Metering | Medium |
| P20EE | SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 1 | Fuel Metering | Medium |
| P20EF | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1 | Fuel Metering | Medium |
| P20F0 | SCR NOx Catalyst - Over Temperature Bank 2 | Fuel Metering | Medium |
| P20F1 | SCR NOx Pre-Catalyst - Over Temperature Bank 2 | Fuel Metering | Medium |
| P20F2 | SCR NOx Catalyst Efficiency Below Threshold Bank 2 | Fuel Metering | Medium |
| P20F3 | SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 2 | Fuel Metering | Medium |
| P20F4 | Reductant Consumption Too Low | Fuel Metering | Medium |
| P20F5 | Reductant Consumption Too High | Fuel Metering | Medium |
| P20F6 | Reductant Injection Valve Stuck Open Bank 1 Unit 1 | Fuel Metering | Medium |
| P20F7 | Reductant Injection Valve Stuck Open Bank 2 Unit 1 | Fuel Metering | Medium |
| P20F8 | Intake Manifold Runner Control Circuit Performance Bank 1 | Fuel Metering | Medium |
| P20F9 | Intake Manifold Runner Control Circuit Performance Bank 2 | Fuel Metering | Medium |
| P20FA | Reductant Pump B Control Circuit/Open | Fuel Metering | Medium |
| P20FB | Reductant Pump B Control Performance/Stuck Off | Fuel Metering | Medium |
| P20FC | Reductant Pump B Control Circuit Low | Fuel Metering | Medium |
| P20FD | Reductant Pump B Control Circuit High | Fuel Metering | Medium |
| P20FE | Reductant Metering Unit 1 Performance | Fuel Metering | Medium |
| P20FF | Reductant Control Module Performance | Fuel Metering | Medium |
| P213E | Fuel Injection System Fault - Forced Engine Shutdown | Fuel Injection | Medium |
| P213F | Fuel Pump System Fault - Forced Engine Shutdown | Fuel Pump | High |
| P214A | SCR NOx Catalyst Inlet Temperature Too High | Fuel Injection | Medium |
| P214B | SCR NOx Catalyst Inlet Temperature Too High During Particulate Filter Regeneration | Fuel Injection | Medium |
| P214C | SCR NOx Catalyst Outlet Temperature Too High | Fuel Injection | Medium |
| P214D | SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration | Fuel Injection | Medium |
| P214E | Reductant Pump A Current Too High | Fuel Injection | Medium |
| P214F | Reductant Heater A Current Too High | Fuel Injection | Medium |
About Fuel System Codes
This page lists all 5,039 OBD-II diagnostic trouble codes classified under the Fuel System category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the fuel system system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.
When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.
Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.