Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 43 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P2A5A | Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit | Fuel Metering | Medium |
| P2A5B | Alternative Fuel Vaporizer C Outlet Temperature Sensor Range/Performance | Fuel Metering | Medium |
| P2A5C | Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit Low | Fuel Metering | Medium |
| P2A5D | Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit High | Fuel Metering | Medium |
| P2A5E | Alternative Fuel Vaporizer C Outlet Temperature Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2A5F | Alternative Fuel Tank B Level Sensor Circuit | Fuel Metering | Medium |
| P2A60 | Alternative Fuel Tank B Level Sensor Range/Performance | Fuel Metering | Medium |
| P2A61 | Alternative Fuel Tank B Level Sensor Circuit Low | Fuel Metering | Medium |
| P2A62 | Alternative Fuel Tank B Level Sensor Circuit High | Fuel Metering | Medium |
| P2A63 | Alternative Fuel Tank B Level Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2A64 | Alternative Fuel Tank C Level Sensor Circuit | Fuel Metering | Medium |
| P2A65 | Alternative Fuel Tank C Level Sensor Range/Performance | Fuel Metering | Medium |
| P2A66 | Alternative Fuel Tank C Level Sensor Circuit Low | Fuel Metering | Medium |
| P2A67 | Alternative Fuel Tank C Level Sensor Circuit High | Fuel Metering | Medium |
| P2A68 | Alternative Fuel Tank C Level Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2A69 | Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit | Fuel Metering | Medium |
| P2A6A | Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Range/Performance | Fuel Metering | Medium |
| P2A6B | Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit Low | Fuel Metering | Medium |
| P2A6C | Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit High | Fuel Metering | Medium |
| P2A6D | Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2A6E | Alternative Fuel Rail Pressure Regulator Inlet Pressure Too Low | Fuel Metering | Medium |
| P2A6F | Alternative Fuel Rail Pressure Regulator Inlet Pressure Too High | Fuel Metering | Medium |
| P2A70 | Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit | Fuel Metering | Medium |
| P2A71 | Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/Performance | Fuel Metering | Medium |
| P2A72 | Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit Low | Fuel Metering | Medium |
| P2A73 | Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit High | Fuel Metering | Medium |
| P2A74 | Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2A75 | Alternative Fuel Hydraulic Pump Pressure Sensor Circuit | Fuel Metering | Medium |
| P2A76 | Alternative Fuel Hydraulic Pump Pressure Sensor Range/Performance | Fuel Metering | Medium |
| P2A77 | Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Low | Fuel Metering | Medium |
| P2A78 | Alternative Fuel Hydraulic Pump Pressure Sensor Circuit High | Fuel Metering | Medium |
| P2A79 | Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2A7A | Alternative Fuel Hydraulic Pressure Sensor Circuit | Fuel Metering | Medium |
| P2A7B | Alternative Fuel Hydraulic Pressure Sensor Range/Performance | Fuel Metering | Medium |
| P2A7C | Alternative Fuel Hydraulic Pressure Sensor Circuit Low | Fuel Metering | Medium |
| P2A7D | Alternative Fuel Hydraulic Pressure Sensor Circuit High | Fuel Metering | Medium |
| P2A7E | Alternative Fuel Hydraulic Pressure Sensor Circuit Intermitttent/Erratic | Fuel Metering | Medium |
| P2A7F | Alternative Fuel Pump A Compression Stroke Valve Control Circuit/Open | Fuel Metering | Medium |
| P2A80 | Alternative Fuel Pump A Compression Stroke Valve Control Circuit Range/Performance | Fuel Metering | Medium |
| P2A81 | Alternative Fuel Pump A Compression Stroke Valve Control Circuit Low | Fuel Metering | Medium |
| P2A82 | Alternative Fuel Pump A Compression Stroke Valve Control Circuit High | Fuel Metering | Medium |
| P2A83 | Alternative Fuel Pump B Compression Stroke Valve Control Circuit/Open | Fuel Metering | Medium |
| P2A84 | Alternative Fuel Pump B Compression Stroke Valve Control Circuit Range/Performance | Fuel Metering | Medium |
| P2A85 | Alternative Fuel Pump B Compression Stroke Valve Control Circuit Low | Fuel Metering | Medium |
| P2A86 | Alternative Fuel Pump B Compression Stroke Valve Control Circuit High | Fuel Metering | Medium |
| P2A87 | Alternative Fuel Pump C Compression Stroke Valve Control Circuit/Open | Fuel Metering | Medium |
| P2A88 | Alternative Fuel Pump C Compression Stroke Valve Control Circuit Range/Performance | Fuel Metering | Medium |
| P2A89 | Alternative Fuel Pump C Compression Stroke Valve Control Circuit Low | Fuel Metering | Medium |
| P2A8A | Alternative Fuel Pump C Compression Stroke Valve Control Circuit High | Fuel Metering | Medium |
| P2A8B | Alternative Fuel Vaporizer A Performance | Fuel Metering | Medium |
| P2A8C | Alternative Fuel Vaporizer B Performance | Fuel Metering | Medium |
| P2A8D | Alternative Fuel Vaporizer C Performance | Fuel Metering | Medium |
| P2A8E | Alternative Fuel Pump A Performance | Fuel Metering | Medium |
| P2A8F | Alternative Fuel Pump B Performance | Fuel Metering | Medium |
| P2A90 | Alternative Fuel Pump C Performance | Fuel Metering | Medium |
| P2A91 | Alternative Fuel Tank Select Valve A Control Circuit/Open | Fuel Metering | Medium |
| P2A92 | Alternative Fuel Tank Select Valve A Control Performance | Fuel Metering | Medium |
| P2A93 | Alternative Fuel Tank Select Valve A Control Circuit Low | Fuel Metering | Medium |
| P2A94 | Alternative Fuel Tank Select Valve A Control Circuit High | Fuel Metering | Medium |
| P2A95 | Alternative Fuel Tank Select Valve B Control Circuit/Open | Fuel Metering | Medium |
| P2A96 | Alternative Fuel Tank Select Valve B Control Circuit Performance | Fuel Metering | Medium |
| P2A97 | Alternative Fuel Tank Select Valve B Control Circuit Low | Fuel Metering | Medium |
| P2A98 | Alternative Fuel Tank Select Valve B Control Circuit High | Fuel Metering | Medium |
| P2A99 | Alternative Fuel Tank Select Valve C Control Circuit/Open | Fuel Metering | Medium |
| P2A9A | Alternative Fuel Tank Select Valve C Control Circuit Performance | Fuel Metering | Medium |
| P2A9B | Alternative Fuel Tank Select Valve C Control Circuit Low | Fuel Metering | Medium |
| P2A9C | Alternative Fuel Tank Select Valve C Control Circuit High | Fuel Metering | Medium |
| P2A9D | Alternative Fuel High Pressure System Small Leak | Fuel Metering | Medium |
| P2A9E | Alternative Fuel Return Line Valve Control Circuit/Open | Fuel Metering | Medium |
| P2A9F | Alternative Fuel Return Line Valve Control Circuit Range/Performance | Fuel Metering | Medium |
| P2AA0 | Alternative Fuel Return Line Valve Control Circuit Low | Fuel Metering | Medium |
| P2AA1 | Alternative Fuel Return Line Valve Control Circuit High | Fuel Metering | Medium |
| P2AA2 | Alternative Fuel Return Line Insufficient Flow | Fuel Metering | Medium |
| P2AA3 | Cold Start EGR B Flow Insufficient Detected | Fuel Metering | Medium |
| P2AA4 | Cold Start EGR B Flow Excessive Detected | Fuel Metering | Medium |
| P2AA5 | EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1 | Fuel Metering | Medium |
| P2AA6 | EGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 2 | Fuel Metering | Medium |
| P2AA7 | Engine Coolant Bypass Valve B Position Sensor Circuit | Fuel Metering | Medium |
| P2AA8 | Engine Coolant Bypass Valve B Position Sensor Circuit Range/Performance | Fuel Metering | Medium |
| P2AA9 | Engine Coolant Bypass Valve B Position Sensor Circuit Low | Fuel Metering | Medium |
| P2AAA | Engine Coolant Bypass Valve B Position Sensor Circuit High | Fuel Metering | Medium |
| P2AAB | Engine Coolant Bypass Valve B Position Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P2AAC | Diesel Fuel Presence Sensor Circuit | Fuel Metering | Medium |
| P2AAD | Diesel Fuel Presence Sensor Circuit Range/Performance | Fuel Metering | Medium |
| P2AAE | Diesel Fuel Presence Sensor Circuit Low | Fuel Metering | Medium |
| P2AAF | Diesel Fuel Presence Sensor Circuit High | Fuel Metering | Medium |
| P2AB0 | Particulate Matter Sensor Processor Performance | Fuel Metering | Medium |
| P2AB1 | Catalyst Heater Control Module Performance | Fuel Metering | Medium |
| P2AB2 | Catalyst Heater Control Module Supply Voltage | Fuel Metering | Medium |
| P2AB3 | Cold Start Intake Manifold Runner Control Stuck Open Bank 1 | Fuel Metering | Medium |
| P2AB4 | Cold Start Intake Manifold Runner Control Stuck Open Bank 2 | Fuel Metering | Medium |
| P2AB5 | Cold Start Intake Manifold Runner Control Stuck Closed Bank 1 | Fuel Metering | Medium |
| P2AB6 | Cold Start Intake Manifold Runner Control Stuck Closed Bank 2 | Fuel Metering | Medium |
| P2AB7 | Wastegate Position Sensor A Circuit | Fuel Metering | Medium |
| P2AB8 | Wastegate Position Sensor A Circuit Low | Fuel Metering | Medium |
| P2AB9 | Wastegate Position Sensor A Circuit High | Fuel Metering | Medium |
| P2ABA | Wastegate Position Sensor B Circuit | Fuel Metering | Medium |
| P2ABB | Wastegate Position Sensor B Circuit Low | Fuel Metering | Medium |
| P2ABC | Wastegate Position Sensor B Circuit High | Fuel Metering | Medium |
| P2AC7 | Charge Air Cooler Coolant Temperature Sensor B Circuit | 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.