Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 10 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P06B5 | Sensor Power Supply B Circuit High | Fuel Metering | Medium |
| P06B6 | Internal Control Module Knock/Combustion Vibration Sensor Processor 1 Performance | Fuel Metering | Medium |
| P06B7 | Internal Control Module Knock/Combustion Vibration Sensor Processor 2 Performance | Fuel Metering | Medium |
| P06B8 | Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error | Fuel Metering | Medium |
| P06B9 | Cylinder 1 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06BA | Cylinder 2 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06BB | Cylinder 3 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06BC | Cylinder 4 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06BD | Cylinder 5 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06BE | Cylinder 6 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06BF | Cylinder 7 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06C0 | Cylinder 8 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06C1 | Cylinder 9 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06C2 | Cylinder 10 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06C3 | Cylinder 11 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06C4 | Cylinder 12 Glow Plug Circuit Range/Performance | Fuel Metering | Medium |
| P06C5 | Cylinder 1 Glow Plug Incorrect | Fuel Metering | Medium |
| P06C6 | Cylinder 2 Glow Plug Incorrect | Fuel Metering | Medium |
| P06C7 | Cylinder 3 Glow Plug Incorrect | Fuel Metering | Medium |
| P06C8 | Cylinder 4 Glow Plug Incorrect | Fuel Metering | Medium |
| P06C9 | Cylinder 5 Glow Plug Incorrect | Fuel Metering | Medium |
| P06CA | Cylinder 6 Glow Plug Incorrect | Fuel Metering | Medium |
| P06CB | Cylinder 7 Glow Plug Incorrect | Fuel Metering | Medium |
| P06CC | Cylinder 8 Glow Plug Incorrect | Fuel Metering | Medium |
| P06CD | Cylinder 9 Glow Plug Incorrect | Fuel Metering | Medium |
| P06CE | Cylinder 10 Glow Plug Incorrect | Fuel Metering | Medium |
| P06CF | Cylinder 11 Glow Plug Incorrect | Fuel Metering | Medium |
| P06D0 | Cylinder 12 Glow Plug Incorrect | Fuel Metering | Medium |
| P06D2 | Sensor Reference Voltage E Circuit/Open | Fuel Metering | Medium |
| P06D3 | Sensor Reference Voltage E Circuit Low | Fuel Metering | Medium |
| P06D4 | Sensor Reference Voltage E Circuit High | Fuel Metering | Medium |
| P06D5 | Sensor Reference Voltage E Circuit Range/Performance | Fuel Metering | Medium |
| P06D6 | Sensor Reference Voltage F Circuit/Open | Fuel Metering | Medium |
| P06D7 | Sensor Reference Voltage F Circuit Low | Fuel Metering | Medium |
| P06D8 | Sensor Reference Voltage F Circuit High | Fuel Metering | Medium |
| P06D9 | Sensor Reference Voltage F Circuit Range/Performance | Fuel Metering | Medium |
| P06DA | Engine Oil Pressure Control Circuit/Open | Fuel Metering | Medium |
| P06DB | Engine Oil Pressure Control Circuit Low | Fuel Metering | Medium |
| P06DC | Engine Oil Pressure Control Circuit High | Fuel Metering | Medium |
| P06DD | Engine Oil Pressure Control Circuit Performance/Stuck Off | Fuel Metering | Medium |
| P06DE | Engine Oil Pressure Control Circuit Stuck On | Fuel Metering | Medium |
| P06DF | Glow Plug Control Module 1 Memory Checksum Error | Fuel Metering | Medium |
| P06E0 | Cylinder 11 Glow Plug Control Circuit Low | Fuel Metering | Medium |
| P06E1 | Cylinder 11 Glow Plug Control Circuit High | Fuel Metering | Medium |
| P06EA | NOx Sensor Processor Performance Bank 1 Sensor 1 | Fuel Metering | Medium |
| P06EB | NOx Sensor Processor Performance Bank 1 Sensor 2 | Fuel Metering | Medium |
| P06EC | Fuel Injector Control Module Requested MIL Illumination | Fuel Metering | Medium |
| P06ED | Engine RPM Output Circuit Low | Fuel Metering | Medium |
| P06EE | Engine RPM Output Circuit High | Fuel Metering | Medium |
| P06EF | Engine Restart Performance | Fuel Metering | Medium |
| P06F0 | Reductant Control Module Internal Temperature Sensor Circuit | Fuel Metering | Medium |
| P06F1 | Reductant Control Module Internal Temperature Sensor Range/Performance | Fuel Metering | Medium |
| P06F2 | Reductant Control Module Internal Temperature Sensor Circuit Low | Fuel Metering | Medium |
| P06F3 | Reductant Control Module Internal Temperature Sensor Circuit High | Fuel Metering | Medium |
| P06F4 | Stop-Start Mode Lamp Control Circuit | Fuel Metering | Medium |
| P06F5 | Glow Plug Control Module 2 | Fuel Metering | Medium |
| P06F6 | Glow Plug Control Module 2 Control Circuit/Open | Fuel Metering | Medium |
| P06F7 | Glow Plug Control Module 2 Control Circuit Low | Fuel Metering | Medium |
| P06F8 | Glow Plug Control Module 2 Control Circuit High | Fuel Metering | Medium |
| P06F9 | Glow Plug Control Module 2 System Voltage | Fuel Metering | Medium |
| P06FA | Glow Plug Control Module 2 Performance | Fuel Metering | Medium |
| P06FB | Glow Plug Control Module 2 Memory Checksum Error | Fuel Metering | Medium |
| P06FC | Glow Plug Control Module 2 to PCM Communication Circuit | Fuel Metering | Medium |
| P06FD | Glow Plug Control Module 2 to PCM Communication Circuit Range/Performance | Fuel Metering | Medium |
| P06FE | Cold Start Diesel Intake Air Flow Control Performance | Fuel Metering | Medium |
| P06FF | Economy Mode Lamp Control Circuit | Fuel Metering | Medium |
| P070A | Transmission Fluid Level Sensor Circuit | Fuel Metering | Medium |
| P070B | Transmission Fluid Level Sensor Circuit Range/Performance | Fuel Metering | Medium |
| P070C | Transmission Fluid Level Sensor Circuit Low | Fuel Metering | Medium |
| P070D | Transmission Fluid Level Sensor Circuit High | Fuel Metering | Medium |
| P070E | Transmission Fluid Level Sensor Circuit intermittent/Erratic | Fuel Metering | Medium |
| P070F | Transmission Fluid Level Too Low | Fuel Metering | Medium |
| P071A | Transmission Mode Switch A Circuit | Fuel Metering | Medium |
| P071B | Transmission Mode Switch A Circuit Low | Fuel Metering | Medium |
| P071C | Transmission Mode Switch A Circuit High | Fuel Metering | Medium |
| P071D | Transmission Mode Switch B Circuit | Fuel Metering | Medium |
| P071E | Transmission Mode Switch B Circuit Low | Fuel Metering | Medium |
| P071F | Transmission Mode Switch B Circuit High | Fuel Metering | Medium |
| P072A | Stuck in Neutral | Fuel Metering | Medium |
| P072B | Stuck In Reverse | Fuel Metering | Medium |
| P072C | Stuck in Gear 1 | Fuel Metering | Medium |
| P072D | Stuck in Gear 2 | Fuel Metering | Medium |
| P072E | Stuck in Gear 3 | Fuel Metering | Medium |
| P072F | Stuck in Gear 4 | Fuel Metering | Medium |
| P073A | Stuck in Gear 5 | Fuel Metering | Medium |
| P073B | Stuck in Gear 6 | Fuel Metering | Medium |
| P073C | Stuck in Gear 7 | Fuel Metering | Medium |
| P073D | Unable to Engage Neutral | Fuel Metering | Medium |
| P073E | Unable to Engage Reverse | Fuel Metering | Medium |
| P073F | Unable to Engage Gear 1 | Fuel Metering | Medium |
| P074A | Unable To Engage Gear 2 | Fuel Metering | Medium |
| P074B | Unable To Engage Gear 3 | Fuel Metering | Medium |
| P074C | Unable To Engage Gear 4 | Fuel Metering | Medium |
| P074D | Unable To Engage Gear 5 | Fuel Metering | Medium |
| P074E | Unable To Engage Gear 6 | Fuel Metering | Medium |
| P074F | Unable To Engage Gear 7 | Fuel Metering | Medium |
| P075A | Shift Solenoid G | Fuel Metering | Medium |
| P075B | Shift Solenoid G Performance/Stuck Off | Fuel Metering | Medium |
| P075C | Shift Solenoid G Stuck On | Fuel Metering | Medium |
| P075D | Shift Solenoid G Electrical | 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.