Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 33 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P21F3 | Cylinder 12 Injector B Circuit High | Fuel Metering | Medium |
| P21F4 | Fuel Control System B Too Lean Off Idle Bank 1 | Fuel Metering | Medium |
| P21F5 | Fuel Control System B Too Rich Off Idle Bank 1 | Fuel Metering | Medium |
| P21F6 | Fuel Control System B Too Lean Off Idle Bank 2 | Fuel Metering | Medium |
| P21F7 | Fuel Control System B Too Rich Off Idle Bank 2 | Fuel Metering | Medium |
| P21F8 | Fuel Control System B Too Lean at Idle Bank 1 | Fuel Metering | Medium |
| P21F9 | Fuel Control System B Too Rich at Idle Bank 1 | Fuel Metering | Medium |
| P21FA | Fuel Control System B Too Lean at Idle Bank 2 | Fuel Metering | Medium |
| P21FB | Fuel Control System B Too Rich at Idle Bank 2 | Fuel Metering | Medium |
| P21FC | Fuel Control System B Too Lean at Higher Load Bank 1 | Fuel Metering | Medium |
| P21FD | Fuel Control System B Too Rich at Higher Load Bank 1 | Fuel Metering | Medium |
| P21FE | Fuel Control System B Too Lean at Higher Load Bank 2 | Fuel Metering | Medium |
| P21FF | Fuel Control System B Too Rich at Higher Load Bank 2 | Fuel Metering | Medium |
| P220A | NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1 | Fuel Injection | Medium |
| P220B | NOx Sensor Supply Voltage Circuit Bank 1 Sensor 2 | Fuel Injection | Medium |
| P220C | NOx Sensor Supply Voltage Circuit Bank 2 Sensor 1 | Fuel Injection | Medium |
| P220D | NOx Sensor Supply Voltage Circuit Bank 2 Sensor 2 | Fuel Injection | Medium |
| P220E | NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 1 | Fuel Injection | Medium |
| P220F | NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 2 | Fuel Injection | Medium |
| P221A | NOx Sensor 1/2 Correlation Bank 1 | Fuel Injection | Medium |
| P221B | NOx Sensor 1/2 Correlation Bank 2 | Fuel Injection | Medium |
| P221C | Reductant Heater B Current Too Low | Fuel Injection | Medium |
| P221D | Reductant Heater B Current Too High | Fuel Injection | Medium |
| P221E | Reductant Heater C Current Too Low | Fuel Injection | Medium |
| P221F | Reductant Heater C Current Too High | Fuel Injection | Medium |
| P222A | Barometric Pressure Sensor B Circuit | Fuel Injection | Medium |
| P222B | Barometric Pressure Sensor B Circuit Range/Performance | Fuel Injection | Medium |
| P222C | Barometric Pressure Sensor B Circuit Low | Fuel Injection | Medium |
| P222D | Barometric Pressure Sensor B Circuit High | Fuel Injection | Medium |
| P222E | Barometric Pressure Sensor B Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P222F | Barometric Pressure Sensor A/B Correlation | Fuel Injection | Medium |
| P223A | Reductant Heater E Control Circuit | Fuel Injection | Medium |
| P223B | Reductant Heater F Control Circuit | Fuel Injection | Medium |
| P223C | O2 Sensor Pumping Current Range/Performance Bank 1 | Fuel Injection | Medium |
| P223D | O2 Sensor Pumping Current Range/Performance Bank 2 | Fuel Injection | Medium |
| P223E | O2 Sensor Reference Resistance Out Of Range Bank 1 | Fuel Injection | Medium |
| P223F | O2 Sensor Reference Resistance Out Of Range Bank 2 | Fuel Injection | Medium |
| P224A | NOx Sensor Heater Resistance Bank 1 Sensor 1 | Fuel Injection | Medium |
| P224B | NOx Sensor Heater Resistance Bank 1 Sensor 2 | Fuel Injection | Medium |
| P224C | Alternative Fuel Tank Shutoff Valve A Control Circuit/Open | Fuel Injection | Medium |
| P224D | Alternative Fuel Tank Shutoff Valve A Control Circuit Performance/Stuck Off | Fuel Injection | Medium |
| P224E | Alternative Fuel Tank Shutoff Valve A Control Circuit Low | Fuel Injection | Medium |
| P224F | Alternative Fuel Tank Shutoff Valve A Control Circuit High | Fuel Injection | Medium |
| P225A | NOx Sensor Calibration Memory Bank 1 Sensor 1 | Fuel Injection | Medium |
| P225B | NOx Sensor Calibration Memory Bank 1 Sensor 2 | Fuel Injection | Medium |
| P225C | NOx Sensor Performance - Signal Biased/Stuck High Bank 1 Sensor 1 | Fuel Injection | Medium |
| P225D | NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 1 | Fuel Injection | Medium |
| P225E | NOx Sensor Performance - Signal Biased/Stuck High Bank 1 Sensor 2 | Fuel Injection | Medium |
| P225F | NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 2 | Fuel Injection | Medium |
| P2269 | Water in Fuel Condition | Fuel Quality | High |
| P226A | Water in Fuel Lamp Control Circuit | Fuel Injection | Medium |
| P226D | Particulate Filter Deteriorated/Missing Substrate Bank 1 | Fuel Injection | Medium |
| P226E | Particulate Filter Deteriorated/Missing Substrate Bank 2 | Fuel Injection | Medium |
| P227A | Barometric Pressure Sensor C Circuit | Fuel Injection | Medium |
| P227B | Barometric Pressure Sensor C Circuit Range/Performance | Fuel Injection | Medium |
| P227C | Barometric Pressure Sensor C Circuit Low | Fuel Injection | Medium |
| P227D | Barometric Pressure Sensor C Circuit High | Fuel Injection | Medium |
| P227E | Barometric Pressure Sensor C Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P227F | Air Flow Restriction/Air Leak Between Air Filter and MAF Bank 2 | Fuel Injection | Medium |
| P228A | Fuel Pressure Regulator A - Forced Engine Shutdown | Fuel Injection | Medium |
| P228B | Fuel Pressure Regulator B - Forced Engine Shutdown | Fuel Injection | Medium |
| P228C | Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too Low | Fuel Injection | Medium |
| P228D | Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too High | Fuel Injection | Medium |
| P228E | Fuel Pressure Regulator A Exceeded Learning Limits - Too Low | Fuel Injection | Medium |
| P228F | Fuel Pressure Regulator A Exceeded Learning Limits - Too High | Fuel Injection | Medium |
| P2290 | Injector Control Pressure Too Low | Diesel Injection | High |
| P2291 | Injector Control Pressure Too Low Engine Cranking | Diesel Injection | Critical |
| P229A | Fuel Pressure Regulator B Exceeded Control Limits - Pressure Too Low | Fuel Injection | Medium |
| P229B | Fuel Pressure Regulator B Exceeded Control Limits - Pressure Too High | Fuel Injection | Medium |
| P229C | Fuel Pressure Regulator B Exceeded Learning Limits - Too Low | Fuel Injection | Medium |
| P229D | Fuel Pressure Regulator B Exceeded Learning Limits - Too High | Fuel Injection | Medium |
| P229E | NOx Sensor Circuit Bank 1 Sensor 2 | Fuel Injection | Medium |
| P229F | NOx Sensor Circuit Range/Performance Bank 1 Sensor 2 | Fuel Injection | Medium |
| P22A0 | NOx Sensor Circuit Low Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A1 | NOx Sensor Circuit High Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A2 | NOx Sensor Circuit Intermittent Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A3 | NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A4 | NOx Sensor Heater Control Circuit Low Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A5 | NOx Sensor Heater Control Circuit High Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A6 | NOx Sensor Heater Sense Circuit Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A7 | NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A8 | NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22A9 | NOx Sensor Heater Sense Circuit High Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22AA | NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22D9 | Cylinder 1 Alternative Fuel Injector Control Circuit/Open | Fuel Metering | Medium |
| P22DA | Cylinder 1 Alternative Fuel Injector Control Circuit Low | Fuel Metering | Medium |
| P22DB | Cylinder 1 Alternative Fuel Injector Control Circuit High | Fuel Metering | Medium |
| P22DC | Cylinder 1 Alternative Fuel Injector Control Circuit Range/Performance | Fuel Metering | Medium |
| P22DD | Cylinder 2 Alternative Fuel Injector Control Circuit/Open | Fuel Metering | Medium |
| P22DE | Cylinder 2 Alternative Fuel Injector Control Circuit Low | Fuel Metering | Medium |
| P22DF | Cylinder 2 Alternative Fuel Injector Control Circuit High | Fuel Metering | Medium |
| P22E0 | Cylinder 2 Alternative Fuel Injector Control Circuit Range/Performance | Fuel Metering | Medium |
| P22E1 | Cylinder 3 Alternative Fuel Injector Control Circuit/Open | Fuel Injection | Medium |
| P22E3 | Cylinder 3 Alternative Fuel Injector Control Circuit High | Fuel System | Medium |
| P22E4 | Cylinder 3 Alternative Fuel Injector Control Circuit Range/Performance | Fuel System | Medium |
| P22E5 | Cylinder 4 Alternative Fuel Injector Control Circuit/Open | Fuel System | Medium |
| P22E6 | Cylinder 4 Alternative Fuel Injector Control Circuit Low | Fuel System | Medium |
| P22E7 | Cylinder 4 Alternative Fuel Injector Control Circuit High | Fuel System | Medium |
| P22E8 | Cylinder 4 Alternative Fuel Injector Control Circuit Range/Performance | Fuel System | Medium |
| P22E9 | Cylinder 5 Alternative Fuel Injector Control Circuit/Open | Fuel System | 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.