Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 37 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P24FA | Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Low | Fuel Metering | Medium |
| P24FB | Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit High | Fuel Metering | Medium |
| P24FC | Particulate Matter Sensor Heater Control Circuit Driver Current/Temperature Too High | Fuel Metering | Medium |
| P24FD | Particulate Filter A Incorrect | Fuel Metering | Medium |
| P24FE | SCR Catalyst Incorrect | Fuel Metering | Medium |
| P24FF | Reductant Temperature Too High | Fuel Metering | Medium |
| P250A | Engine Oil Level Sensor Circuit | Fuel Injection | Medium |
| P250B | Engine Oil Level Sensor Circuit Range/Performance | Fuel Injection | Medium |
| P250C | Engine Oil Level Sensor Circuit Low | Fuel Injection | Medium |
| P250D | Engine Oil Level Sensor Circuit High | Fuel Injection | Medium |
| P250E | Engine Oil Level Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P250F | Engine Oil Level Too Low | Fuel Injection | Medium |
| P251A | PTO Enable Switch Circuit/Open | Fuel Injection | Medium |
| P251B | PTO Enable Switch Circuit Low | Fuel Injection | Medium |
| P251C | PTO Enable Switch Circuit High | Fuel Injection | Medium |
| P251D | PTO Engine Shutdown Circuit/Open | Fuel Injection | Medium |
| P251E | PTO Engine Shutdown Circuit Low | Fuel Injection | Medium |
| P251F | PTO Engine Shutdown Circuit High | Fuel Injection | Medium |
| P252A | Engine Oil Quality Sensor Circuit | Fuel Injection | Medium |
| P252B | Engine Oil Quality Sensor Circuit Range/Performance | Fuel Injection | Medium |
| P252C | Engine Oil Quality Sensor Circuit Low | Fuel Injection | Medium |
| P252D | Engine Oil Quality Sensor Circuit High | Fuel Injection | Medium |
| P252E | Engine Oil Quality Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P252F | Engine Oil Level Too High | Fuel Injection | Medium |
| P253A | PTO Sense Circuit/Open | Fuel Injection | Medium |
| P253B | PTO Sense Circuit Range/Performance | Fuel Injection | Medium |
| P253C | PTO Sense Circuit Low | Fuel Injection | Medium |
| P253D | PTO Sense Circuit High | Fuel Injection | Medium |
| P253E | PTO Sense Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P253F | Engine Oil Deteriorated | Fuel Injection | Medium |
| P254A | PTO Speed Selector Sensor/Switch 1 Circuit/Open | Fuel Injection | Medium |
| P254B | PTO Speed Selector Sensor/Switch 1 Range/Performance | Fuel Injection | Medium |
| P254C | PTO Speed Selector Sensor/Switch 1 Circuit Low | Fuel Injection | Medium |
| P254D | PTO Speed Selector Sensor/Switch 1 Circuit High | Fuel Injection | Medium |
| P254E | PTO Speed Selector Sensor/Switch 1 Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P254F | Engine Hood Switch Circuit | Fuel Injection | Medium |
| P255A | PTO Speed Selector Sensor/Switch 2 Circuit/Open | Fuel Injection | Medium |
| P255B | PTO Speed Selector Sensor/Switch 2 Range/Performance | Fuel Injection | Medium |
| P255C | PTO Speed Selector Sensor/Switch 2 Circuit Low | Fuel Injection | Medium |
| P255D | PTO Speed Selector Sensor/Switch 2 Circuit High | Fuel Injection | Medium |
| P255E | PTO Speed Selector Sensor/Switch 2 Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P255F | A/C Request A Circuit Range/Performance | Fuel Injection | Medium |
| P256A | Engine Idle Speed Selector Sensor/Switch Circuit/Open | Fuel Injection | Medium |
| P256B | Engine Idle Speed Selector Sensor/Switch Range/Performance | Fuel Injection | Medium |
| P256C | Engine Idle Speed Selector Sensor/Switch Circuit Low | Fuel Injection | Medium |
| P256D | Engine Idle Speed Selector Sensor/Switch Circuit High | Fuel Injection | Medium |
| P256E | Engine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P256F | A/C Request B Circuit Range/Performance | Fuel Injection | Medium |
| P257A | Vacuum Reservoir Control Circuit/Open | Fuel Injection | Medium |
| P257B | Vacuum Reservoir Control Circuit Low | Fuel Injection | Medium |
| P257C | Vacuum Reservoir Control Circuit High | Fuel Injection | Medium |
| P257D | Engine Hood Switch Circuit Range/Performance | Fuel Injection | Medium |
| P257E | Engine Hood Switch Circuit Low | Fuel Injection | Medium |
| P257F | Engine Hood Switch Circuit High | Fuel Injection | Medium |
| P258A | Vacuum Pump Control Circuit A/Open | Fuel Injection | Medium |
| P258B | Vacuum Pump Control Circuit A Range/Performance | Fuel Injection | Medium |
| P258C | Vacuum Pump Control Circuit A Low | Fuel Injection | Medium |
| P258D | Vacuum Pump Control Circuit A High | Fuel Injection | Medium |
| P258E | PTO Enable Switch Performance | Fuel Injection | Medium |
| P258F | Torque Management Request Output Signal | Fuel Injection | Medium |
| P25A2 | Brake System Control Module A Requested MIL Illumination | Fuel Metering | Medium |
| P25A3 | Engine Hood Open | Fuel Metering | Medium |
| P25A4 | Fuel Mode Select Switch Circuit | Fuel Metering | Medium |
| P25A5 | Fuel Mode Select Switch Performance | Fuel Metering | Medium |
| P25A6 | Fuel Mode Select Switch Circuit Low | Fuel Metering | Medium |
| P25A7 | Fuel Mode Select Switch Circuit High | Fuel Metering | Medium |
| P25A8 | Fuel Mode Select Switch Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P25A9 | Piston Cooling Oil Control Circuit/Open | Fuel Metering | Medium |
| P25AA | Piston Cooling Oil Control Circuit Low | Fuel Metering | Medium |
| P25AB | Piston Cooling Oil Control Circuit High | Fuel Metering | Medium |
| P25AC | Piston Cooling Oil Control Circuit Performance/Stuck Off | Fuel Metering | Medium |
| P25AD | Piston Cooling Oil Control Circuit Stuck On | Fuel Metering | Medium |
| P25AE | Piston Cooling Oil Pressure Too Low | Fuel Metering | Medium |
| P25AF | Coolant Temperature Control Module Requested MIL Illumination | Fuel Metering | Medium |
| P25B0 | Fuel Level Sensor A Stuck | Fuel Metering | Medium |
| P25B1 | Fuel Level Sensor B Stuck | Fuel Metering | Medium |
| P25B2 | Fuel Level Sensor A or B Stuck | Fuel Metering | Medium |
| P25BA | Regeneration Control Switch Circuit/Open | Fuel Metering | Medium |
| P25BB | Regeneration Control Switch Circuit Low | Fuel Metering | Medium |
| P25BC | Regeneration Control Switch Circuit High | Fuel Metering | Medium |
| P25BD | Unmetered Fuel - Forced Engine Shutdown | Fuel Metering | Medium |
| P25BE | Alternative Fuel Disable Control Circuit/Open | Fuel Metering | Medium |
| P25BF | Alternative Fuel Disable Control Circuit High | Fuel Metering | Medium |
| P25C0 | Alternative Fuel Disable Control Circuit Low | Fuel Metering | Medium |
| P25C1 | Alternative Fuel Disable Signal Circuit | Fuel Metering | Medium |
| P25C2 | Alternative Fuel Disable Signal Circuit High | Fuel Metering | Medium |
| P25C3 | Alternative Fuel Disable Signal Circuit Low | Fuel Metering | Medium |
| P25C9 | Brake System Control Module B Requested MIL Illumination | Fuel Metering | Medium |
| P25D6 | Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Stop Performance | Fuel Metering | Medium |
| P25D7 | Fuel Level Sensor C Circuit | Fuel Metering | Medium |
| P25D8 | Fuel Level Sensor C Performance | Fuel Metering | Medium |
| P25D9 | Fuel Level Sensor C Circuit Low | Fuel Metering | Medium |
| P25DA | Fuel Level Sensor C Circuit High | Fuel Metering | Medium |
| P25DB | Fuel Level Sensor C Circuit Intermittent | Fuel Metering | Medium |
| P25DC | Fuel Level Sensor C Stuck | Fuel Metering | Medium |
| P25E1 | A Camshaft Position - Unable to Achieve Locked Position Bank 2 | Fuel Injection | Medium |
| P25EE | Vacuum Pump Control Circuit B/Open | Fuel Metering | Medium |
| P25EF | Vacuum Pump Control Circuit B Range/Performance | Fuel Metering | Medium |
| P25F0 | Vacuum Pump Control Circuit B Low | Fuel Metering | Medium |
| P25F1 | Vacuum Pump Control Circuit B High | 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.