Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 7 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P048B | Exhaust Pressure Control Valve A Position Sensor/Switch Circuit | Fuel Metering | Medium |
| P048C | Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Range/Performance | Fuel Metering | Medium |
| P048D | Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Low | Fuel Metering | Medium |
| P048E | Exhaust Pressure Control Valve A Position Sensor/Switch Circuit High | Fuel Metering | Medium |
| P048F | Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P049A | EGR B Flow | Fuel Metering | Medium |
| P049B | EGR B Flow Insufficient Detected | Fuel Metering | Medium |
| P049C | EGR B Flow Excessive Detected | Fuel Metering | Medium |
| P049D | EGR A Control Position Exceeded Learning Limit | Fuel Metering | Medium |
| P049E | EGR B Control Position Exceeded Learning Limit | Fuel Metering | Medium |
| P049F | Exhaust Pressure Control Valve B | Fuel Metering | Medium |
| P04A0 | Exhaust Pressure Control Valve B Range/Performance | Fuel Metering | Medium |
| P04A1 | Exhaust Pressure Control Valve B Low | Fuel Metering | Medium |
| P04A2 | Exhaust Pressure Control Valve B High | Fuel Metering | Medium |
| P04A3 | Exhaust Pressure Control Valve B Intermittent | Fuel Metering | Medium |
| P04A4 | Exhaust Pressure Control Valve B Stuck Open | Fuel Metering | Medium |
| P04A5 | Exhaust Pressure Control Valve B Stuck Closed | Fuel Metering | Medium |
| P04A6 | Exhaust Pressure Control Valve B Position Sensor/Switch Circuit | Fuel Metering | Medium |
| P04A7 | Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Range/Performance | Fuel Metering | Medium |
| P04A8 | Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Low | Fuel Metering | Medium |
| P04A9 | Exhaust Pressure Control Valve B Position Sensor/Switch Circuit High | Fuel Metering | Medium |
| P04AA | Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P04AB | EVAP System Purge Control Valve B Circuit/Open | Fuel Metering | Medium |
| P04AC | EVAP System Purge Control Valve B Circuit Low | Fuel Metering | Medium |
| P04AD | EVAP System Purge Control Valve B Circuit High | Fuel Metering | Medium |
| P04AE | EVAP System Purge Control Valve B Performance/Stuck Open | Fuel Metering | Medium |
| P04AF | EVAP System Purge Control Valve B Stuck Closed | Fuel Metering | Medium |
| P04B0 | Refueling Vapor Control Valve Circuit/Open | Fuel Metering | Medium |
| P04B1 | Refueling Vapor Control Valve Circuit Low | Fuel Metering | Medium |
| P04B2 | Refueling Vapor Control Valve Circuit High | Fuel Metering | Medium |
| P04B3 | Refueling Vapor Control Valve Stuck Performance/Stuck Open | Fuel Metering | Medium |
| P04B4 | Refueling Vapor Control Valve Stuck Closed | Fuel Metering | Medium |
| P04B5 | Fuel Fill Door Stuck Open | Fuel Metering | Medium |
| P04B6 | Fuel Fill Door Stuck Closed | Fuel Metering | Medium |
| P04B7 | Fuel Fill Door Position Sensor/Switch Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P04B8 | Fuel Fill Door Position Sensor/Switch Circuit | Fuel Metering | Medium |
| P04B9 | Fuel Fill Door Position Sensor/Switch Circuit Low | Fuel Metering | Medium |
| P04BA | Fuel Fill Door Position Sensor/Switch Circuit High | Fuel Metering | Medium |
| P04BB | Fuel Fill Door Lock Control Circuit/Open | Fuel Metering | Medium |
| P04BC | Fuel Fill Door Lock Control Range/Performance | Fuel Metering | Medium |
| P04BD | Fuel Fill Door Lock Control Circuit Low | Fuel Metering | Medium |
| P04BE | Fuel Fill Door Lock Control Circuit High | Fuel Metering | Medium |
| P04BF | Fuel Fill Door Unlock Control Circuit/Open | Fuel Metering | Medium |
| P04C0 | Fuel Fill Door Unlock Control Range/Performance | Fuel Metering | Medium |
| P04C1 | Fuel Fill Door Unlock Control Circuit Low | Fuel Metering | Medium |
| P04C2 | Fuel Fill Door Unlock Control Circuit High | Fuel Metering | Medium |
| P04C3 | Fuel Fill Door Lock Position Sensor/Switch Circuit | Fuel Metering | Medium |
| P04C4 | Fuel Fill Door Lock Position Sensor/Switch Circuit Range/Performance | Fuel Metering | Medium |
| P04C5 | Fuel Fill Door Lock Position Sensor/Switch Circuit Low | Fuel Metering | Medium |
| P04C6 | Fuel Fill Door Lock Position Sensor/Switch Circuit High | Fuel Metering | Medium |
| P04C7 | Fuel Fill Door Lock Position Sensor/Switch Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P04C8 | Fuel Fill Door Open Request Sensor/Switch Circuit | Fuel Metering | Medium |
| P04C9 | Fuel Fill Door Open Request Sensor/Switch Performance/Stuck Off | Fuel Metering | Medium |
| P04CA | Fuel Fill Door Open Request Sensor/Switch Circuit Low | Fuel Metering | Medium |
| P04CB | Fuel Fill Door Open Request Sensor/Switch Circuit High | Fuel Metering | Medium |
| P04CC | Fuel Fill Door Open Request Sensor/Switch Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P04CD | Fuel Fill Door Open Request Sensor/Switch Stuck On | Fuel Metering | Medium |
| P04CE | EGR Temperature Sensor C Circuit | Fuel Metering | Medium |
| P04CF | EGR Temperature Sensor C Circuit Range/Performance | Fuel Metering | Medium |
| P04D0 | EGR Temperature Sensor C Circuit Low | Fuel Metering | Medium |
| P04D1 | EGR Temperature Sensor C Circuit High | Fuel Metering | Medium |
| P04D2 | EGR Temperature Sensor C Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P04D3 | Exhaust Brake Input Circuit | Fuel Metering | Medium |
| P04D4 | Exhaust Brake Input Circuit Range/Performance | Fuel Metering | Medium |
| P04D5 | Exhaust Brake Input Circuit Low | Fuel Metering | Medium |
| P04D6 | Exhaust Brake Input Circuit High | Fuel Metering | Medium |
| P04D7 | Exhaust Brake Input Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P04D8 | Excessive Time To Enter Closed Loop EGR Control | Fuel Metering | Medium |
| P04D9 | Closed Loop EGR Control At Limit - Flow Too Low | Fuel Metering | Medium |
| P04DA | Closed Loop EGR Control At Limit - Flow Too High | Fuel Metering | Medium |
| P04DC | Fuel Fill Door Position Sensor/Switch Circuit Range/Performance | Fuel Metering | Medium |
| P04DD | Cold Start EGR A Flow Insufficient Detected | Fuel Metering | Medium |
| P04DE | Cold Start EGR A Flow Excessive Detected | Fuel Metering | Medium |
| P04DF | EVAP System Purge Control Valve A Performance/Stuck Open | Fuel Metering | Medium |
| P04E0 | EVAP System Purge Control Valve A Stuck Closed | Fuel Metering | Medium |
| P04EA | EVAP System Small Leak Detected - Fuel Tank Side | Fuel Metering | Medium |
| P04EB | EVAP System Small Leak Detected - Fresh Air Side | Fuel Metering | Medium |
| P04EC | EVAP System Large Leak Detected - Fuel Tank Side | Fuel Metering | Medium |
| P04ED | EVAP System Large Leak Detected - Fresh Air Side | Fuel Metering | Medium |
| P04EE | EVAP System Very Small Leak Detected - Fuel Tank Side | Fuel Metering | Medium |
| P04EF | EVAP System Very Small Leak Detected - Fresh Air Side | Fuel Metering | Medium |
| P04F0 | EVAP System High Load Purge Line A Performance | Fuel Metering | Medium |
| P04F1 | EVAP System Purge Line Performance | Fuel Metering | Medium |
| P04F2 | Catalyst Heater Supply Voltage Bank 1 | Fuel Metering | Medium |
| P04F3 | Catalyst Heater Supply Voltage Bank 2 | Fuel Metering | Medium |
| P04F4 | Catalyst Heater Circuit Low Bank 1 | Fuel Metering | Medium |
| P04F5 | Catalyst Heater Circuit Low Bank 2 | Fuel Metering | Medium |
| P04F6 | Catalyst Heater Circuit High Bank 1 | Fuel Metering | Medium |
| P04F7 | Catalyst Heater Circuit High Bank 2 | Fuel Metering | Medium |
| P04F8 | Catalyst Heater Circuit Intermittent Bank 1 | Fuel Metering | Medium |
| P04F9 | Catalyst Heater Circuit Intermittent Bank 2 | Fuel Metering | Medium |
| P04FA | EGR A Control Temperature Too High | Fuel Metering | Medium |
| P04FD | EGR Actuator A Control Processor Performance | Fuel Metering | Medium |
| P04FE | Catalyst Heater Circuit Performance Bank 1 | Fuel Metering | Medium |
| P04FF | Catalyst Heater Circuit Performance Bank 2 | Fuel Metering | Medium |
| P050A | Cold Start Idle Control System Performance | Fuel Metering | Medium |
| P050C | Cold Start Engine Coolant Temperature Performance | Fuel Metering | Medium |
| P050D | Cold Start Rough Idle | Fuel Metering | Medium |
| P050E | Cold Start Engine Exhaust Temperature Too Low | Fuel Metering | Medium |
| P050F | Brake Assist Vacuum Too Low | 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.