Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 34 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P22EA | Cylinder 5 Alternative Fuel Injector Control Circuit Low | Fuel Metering | Medium |
| P22EB | Cylinder 5 Alternative Fuel Injector Control Circuit High | Fuel Metering | Medium |
| P22EC | Cylinder 5 Alternative Fuel Injector Control Circuit Range/Performance | Fuel Metering | Medium |
| P22ED | Cylinder 6 Alternative Fuel Injector Control Circuit/Open | Fuel Metering | Medium |
| P22EE | Cylinder 6 Alternative Fuel Injector Control Circuit Low | Fuel Metering | Medium |
| P22EF | Cylinder 6 Alternative Fuel Injector Control Circuit High | Fuel Metering | Medium |
| P22F0 | Cylinder 6 Alternative Fuel Injector Control Circuit Range/Performance | Fuel Metering | Medium |
| P22F1 | Cylinder 7 Alternative Fuel Injector Control Circuit/Open | Fuel Metering | Medium |
| P22F2 | Cylinder 7 Alternative Fuel Injector Control Circuit Low | Fuel Metering | Medium |
| P22F3 | Cylinder 7 Alternative Fuel Injector Control Circuit High | Fuel Metering | Medium |
| P22F4 | Cylinder 7 Alternative Fuel Injector Control Circuit Range/Performance | Fuel Metering | Medium |
| P22F5 | Cylinder 8 Alternative Fuel Injector Control Circuit/Open | Fuel Metering | Medium |
| P22F6 | Cylinder 8 Alternative Fuel Injector Control Circuit Low | Fuel Metering | Medium |
| P22F7 | Cylinder 8 Alternative Fuel Injector Control Circuit High | Fuel Metering | Medium |
| P22F8 | Cylinder 8 Alternative Fuel Injector Control Circuit Range/Performance | Fuel Metering | Medium |
| P22F9 | NOx Sensor Performance - Slow Response Low to High Bank 1 Sensor 1 | Fuel Metering | Medium |
| P22FA | NOx Sensor Performance - Slow Response High to Low Bank 1 Sensor 1 | Fuel Metering | Medium |
| P22FB | NOx Sensor Performance - Sensing Element Bank 1 Sensor 1 | Fuel Metering | Medium |
| P22FC | NOx Sensor Performance - Slow Response Low to High Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22FD | NOx Sensor Performance - Slow Response High to Low Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22FE | NOx Sensor Performance - Sensing Element Bank 1 Sensor 2 | Fuel Metering | Medium |
| P22FF | SCR NOx Catalyst Inlet Temperature Too Low | Fuel Metering | Medium |
| P230A | Cylinder 1 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P230B | Cylinder 2 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P230C | Cylinder 3 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P230D | Cylinder 4 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P230E | Cylinder 5 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P230F | Cylinder 6 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P231A | Cylinder 7 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P231B | Cylinder 8 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P231C | Cylinder 9 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P231D | Cylinder 10 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P231E | Cylinder 11 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P231F | Cylinder 12 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance | Fuel Injection | Medium |
| P232A | TCM Request - Forced Engine Shutdown | Fuel Injection | Medium |
| P232B | Cylinder 11 Fuel Injector A Offset Learning At Min Limit | Fuel Injection | Medium |
| P232C | Cylinder 11 Fuel Injector A Offset Learning At Max Limit | Fuel Injection | Medium |
| P232D | Cylinder 12 Fuel Injector A Offset Learning At Min Limit | Fuel Injection | Medium |
| P232E | Cylinder 12 Fuel Injector A Offset Learning At Max Limit | Fuel Injection | Medium |
| P232F | O2 Sensor Out of Range During Deceleration Bank 1 Sensor 2 | Fuel Injection | Medium |
| P233A | Fuel Pressure Regulator C Control Circuit/Open | Fuel Injection | Medium |
| P233B | Fuel Pressure Regulator C Control Circuit Low | Fuel Injection | Medium |
| P233C | Fuel Pressure Regulator C Control Circuit High | Fuel Injection | Medium |
| P233D | Fuel Pressure Regulator B Solenoid Supply Voltage Control Circuit/Open | Fuel Injection | Medium |
| P233E | Fuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Low | Fuel Injection | Medium |
| P233F | Fuel Pressure Regulator B Solenoid Supply Voltage Control Circuit High | Fuel Injection | Medium |
| P234A | Cylinder 9 Pressure Sensor Circuit Low | Fuel Injection | Medium |
| P234B | Cylinder 9 Pressure Sensor Circuit High | Fuel Injection | Medium |
| P234C | Cylinder 9 Pressure Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P234D | Cylinder 9 Pressure Too Low | Fuel Injection | Medium |
| P234E | Cylinder 9 Pressure Too High | Fuel Injection | Medium |
| P234F | Cylinder 9 Pressure Variation Low | Fuel Injection | Medium |
| P235A | Cylinder 10 Pressure Variation High | Fuel Injection | Medium |
| P235B | Cylinder 10 Combustion Performance | Fuel Injection | Medium |
| P235C | Cylinder 11 Pressure Sensor Circuit | Fuel Injection | Medium |
| P235D | Cylinder 11 Pressure Sensor Circuit Range/Performance | Fuel Injection | Medium |
| P235E | Cylinder 11 Pressure Sensor Circuit Low | Fuel Injection | Medium |
| P235F | Cylinder 11 Pressure Sensor Circuit High | Fuel Injection | Medium |
| P236A | Cylinder 12 Pressure Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P236B | Cylinder 12 Pressure Too Low | Fuel Injection | Medium |
| P236C | Cylinder 12 Pressure Too High | Fuel Injection | Medium |
| P236D | Cylinder 12 Pressure Variation Low | Fuel Injection | Medium |
| P236E | Cylinder 12 Pressure Variation High | Fuel Injection | Medium |
| P236F | Cylinder 12 Combustion Performance | Fuel Injection | Medium |
| P237A | O2 Sensor Exhaust Sample Error Bank 1 Sensor 2 | Fuel Injection | Medium |
| P237B | O2 Sensor Exhaust Sample Error Bank 2 Sensor 2 | Fuel Injection | Medium |
| P237C | Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit/Open | Fuel Injection | Medium |
| P237D | Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit Low | Fuel Injection | Medium |
| P237E | Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit High | Fuel Injection | Medium |
| P237F | Exhaust Heat Exchanger Exhaust Bypass Valve A Control Performance | Fuel Injection | Medium |
| P238A | Water in Fuel Sensor B Circuit | Fuel Injection | Medium |
| P238B | Water in Fuel Sensor B Circuit Range/Performance | Fuel Injection | Medium |
| P238C | Water in Fuel Sensor B Circuit Low | Fuel Injection | Medium |
| P238D | Water in Fuel Sensor B Circuit High | Fuel Injection | Medium |
| P238E | Water in Fuel Sensor B Circuit Intermittent | Fuel Injection | Medium |
| P238F | Water in Fuel Condition - Sensor B | Fuel Injection | Medium |
| P239A | Diesel Intake Air Flow B Position Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P239B | Diesel Intake Air Flow B Control Motor Current Range/Performance | Fuel Injection | Medium |
| P239C | Diesel Intake Air Flow B Control System - High Air Flow Detected | Fuel Injection | Medium |
| P239D | Diesel Intake Air Flow B Control System - Low Air Flow Detected | Fuel Injection | Medium |
| P239E | O2 Sensor Out of Range During Deceleration Bank 1 Sensor 2 | Fuel Injection | Medium |
| P239F | O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2 | Fuel Injection | Medium |
| P23A2 | Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit/Open | Fuel Metering | Medium |
| P23A3 | Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit Low | Fuel Metering | Medium |
| P23A4 | Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit High | Fuel Metering | Medium |
| P23A5 | Exhaust Heat Exchanger Exhaust Bypass Valve B Control Performance | Fuel Metering | Medium |
| P23A6 | Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Open | Fuel Metering | Medium |
| P23A7 | Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Closed | Fuel Metering | Medium |
| P23A8 | Exhaust Heat Exchanger Exhaust Bypass Valve B Position Sensor Stop Performance | Fuel Metering | Medium |
| P23A9 | Communication Fault – Forced Engine Shutdown | Fuel Metering | Medium |
| P23AB | NOx Sensor Processor Performance Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23AC | NOx Sensor Circuit Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23AD | NOx Sensor Circuit Range/Performance Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23AE | NOx Sensor Circuit Low Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23AF | NOx Sensor Circuit High Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23B0 | NOx Sensor Circuit Intermittent Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23B1 | NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23B2 | NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23B3 | NOx Sensor Heater Control Circuit High Bank 1 Sensor 3 | Fuel Metering | Medium |
| P23B4 | NOx Sensor Heater Sense Circuit Bank 1 Sensor 3 | Fuel Metering | 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.