Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 38 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P25F6 | AIR System B | Fuel Metering | Medium |
| P25F7 | AIR System B Incorrect Flow Detected | Fuel Metering | Medium |
| P25FF | Electrical System Voltage Stabilizer Control Module Performance | Fuel Metering | Medium |
| P260A | PTO Control Circuit/Open | Fuel Injection | Medium |
| P260B | PTO Control Circuit Low | Fuel Injection | Medium |
| P260C | PTO Control Circuit High | Fuel Injection | Medium |
| P260D | PTO Engaged Lamp Control Circuit | Fuel Injection | Medium |
| P260E | Particulate Filter Regeneration Lamp Control Circuit | Fuel Injection | Medium |
| P260F | EVAP System Monitoring Processor Performance | Fuel Injection | Medium |
| P2611 | A/C Refrigerant Distribution Valve A Control Circuit/Open | Variable Valve Timing | Medium |
| P2612 | A/C Refrigerant Distribution Valve A Control Circuit Low | Variable Valve Timing | Medium |
| P2613 | A/C Refrigerant Distribution Valve A Control Circuit High | Variable Valve Timing | Medium |
| P261A | Coolant Pump B Control Circuit/Open | Fuel Injection | Medium |
| P261B | Coolant Pump B Control Circuit Performance/Stuck Off | Fuel Injection | Medium |
| P261C | Coolant Pump B Control Circuit Low | Fuel Injection | Medium |
| P261D | Coolant Pump B Control Circuit High | Fuel Injection | Medium |
| P261E | Coolant Pump B Control Circuit Stuck On | Fuel Injection | Medium |
| P261F | Coolant Pump A Control Circuit Stuck On | Fuel Injection | Medium |
| P262A | Fuel Injector - Pilot Injection Not Learned | Fuel Injection | Medium |
| P262B | Control Module Power Off Timer Performance | Fuel Injection | Medium |
| P262C | Sensor Reference Voltage G Circuit/Open | Fuel Injection | Medium |
| P262D | Sensor Reference Voltage G Circuit Low | Fuel Injection | Medium |
| P262E | Sensor Reference Voltage G Circuit High | Fuel Injection | Medium |
| P262F | Sensor Reference Voltage G Circuit Range/Perfomance | Fuel Injection | Medium |
| P263A | MIL Control Circuit Low | Fuel Injection | Medium |
| P263B | MIL Control Circuit High | Fuel Injection | Medium |
| P263C | Glow Plug Control Driver Performance | Fuel Injection | Medium |
| P263D | Reductant Heater Driver Performance | Fuel Injection | Medium |
| P2645 | A Rocker Arm Actuator Control Circuit/Open Bank 1 | Variable Valve Timing | Medium |
| P2646 | A Rocker Arm Actuator Control Circuit/Open Bank 1 | Variable Valve Timing | Medium |
| P2647 | A Rocker Arm Actuator System Stuck On Bank 1 | Variable Valve Timing | Medium |
| P2648 | A Rocker Arm Actuator System Stuck Off Bank 1 | Variable Valve Timing | Medium |
| P2649 | A Rocker Arm Actuator Supply Voltage Circuit Bank 1 | Variable Valve Timing | Medium |
| P264A | A Rocker Arm Actuator Position Sensor Circuit Bank 1 | Fuel Injection | Medium |
| P264B | A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1 | Fuel Injection | Medium |
| P264C | A Rocker Arm Actuator Position Sensor Circuit Low Bank 1 | Fuel Injection | Medium |
| P264D | A Rocker Arm Actuator Position Sensor Circuit High Bank 1 | Fuel Injection | Medium |
| P264E | A Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 1 | Fuel Injection | Medium |
| P264F | Engine Serial Number Not Programmed or Incompatible | Fuel Injection | Medium |
| P2650 | B Rocker Arm Actuator Control Circuit/Open Bank 1 | Variable Valve Timing | Medium |
| P2651 | B Rocker Arm Actuator System Performance/Stuck Off Bank 1 | Variable Valve Timing | Medium |
| P2652 | B Rocker Arm Actuator System Stuck On Bank 1 | Variable Valve Timing | Medium |
| P2653 | B Rocker Arm Actuator Control Circuit Low Bank 1 | Variable Valve Timing | Medium |
| P2654 | B Rocker Arm Actuator Control Circuit High Bank 1 | Variable Valve Timing | Medium |
| P2655 | A Rocker Arm Actuator Control Circuit/Open Bank 2 | Variable Valve Timing | Medium |
| P2656 | A Rocker Arm Actuator System Performance/Stuck Off Bank 2 | Variable Valve Timing | Medium |
| P2657 | A Rocker Arm Actuator System Stuck On Bank 2 | Variable Valve Timing | Medium |
| P2658 | A Rocker Arm Actuator Control Circuit Low Bank 2 | Variable Valve Timing | Medium |
| P2659 | A Rocker Arm Actuator Control Circuit High Bank 2 | Variable Valve Timing | Medium |
| P265A | B Rocker Arm Actuator Position Sensor Circuit Bank 1 | Fuel Injection | Medium |
| P265B | B Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1 | Fuel Injection | Medium |
| P265C | B Rocker Arm Actuator Position Sensor Circuit Low Bank 1 | Fuel Injection | Medium |
| P265D | B Rocker Arm Actuator Position Sensor Circuit High Bank 1 | Fuel Injection | Medium |
| P265E | B Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 1 | Fuel Injection | Medium |
| P265F | Variable A/C Compressor Control Circuit Range/Performance | Fuel Injection | Medium |
| P2660 | B Rocker Arm Actuator Control Circuit/Open Bank 2 | Variable Valve Timing | Medium |
| P2661 | B Rocker Arm Actuator System Performance/Stuck Off Bank 2 | Variable Valve Timing | Medium |
| P2662 | B Rocker Arm Actuator System Stuck On Bank 2 | Variable Valve Timing | Medium |
| P2663 | B Rocker Arm Actuator Control Circuit Low Bank 2 | Variable Valve Timing | Medium |
| P2664 | B Rocker Arm Actuator Control Circuit High Bank 2 | Variable Valve Timing | Medium |
| P2665 | Fuel Shutoff Valve B Control Circuit/Open | Variable Valve Timing | Medium |
| P2666 | Fuel Shutoff Valve B Control Circuit Low | Variable Valve Timing | Medium |
| P2667 | Fuel Shutoff Valve B Control Circuit High | Variable Valve Timing | Medium |
| P266A | A Rocker Arm Actuator Position Sensor Circuit Bank 2 | Fuel Injection | Medium |
| P266B | A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2 | Fuel Injection | Medium |
| P266C | A Rocker Arm Actuator Position Sensor Circuit Low Bank 2 | Fuel Injection | Medium |
| P266D | A Rocker Arm Actuator Position Sensor Circuit High Bank 2 | Fuel Injection | Medium |
| P266E | A Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 2 | Fuel Injection | Medium |
| P266F | A/C Refrigerant Distribution Valve A Control Circuit Driver Current/Temperature Too High | Fuel Injection | Medium |
| P267A | B Rocker Arm Actuator Position Sensor Circuit Bank 2 | Fuel Injection | Medium |
| P267B | B Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2 | Fuel Injection | Medium |
| P267C | B Rocker Arm Actuator Position Sensor Circuit Low Bank 2 | Fuel Injection | Medium |
| P267D | B Rocker Arm Actuator Position Sensor Circuit High Bank 2 | Fuel Injection | Medium |
| P267E | B Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 2 | Fuel Injection | Medium |
| P267F | Control Module Internal Temperature Sensor A Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P268A | Fuel Injector Calibration Not Learned/Programmed | Fuel Injection | Medium |
| P268B | High Pressure Fuel Pump Calibration Not Learned/Programmed | Fuel Pump | High |
| P268C | Cylinder 1 Injector Data Incompatible | Fuel Injection | Medium |
| P268D | Cylinder 2 Injector Data Incompatible | Fuel Injection | Medium |
| P268E | Cylinder 3 Injector Data Incompatible | Fuel Injection | Medium |
| P268F | Cylinder 4 Injector Data Incompatible | Fuel Injection | Medium |
| P269A | Exhaust Aftertreatment Fuel Injector A Circuit High | Fuel Injection | Medium |
| P269B | Exhaust Aftertreatment Glow Plug Control Circuit/Open | Fuel Injection | Medium |
| P269C | Exhaust Aftertreatment Glow Plug Control Performance | Fuel Injection | Medium |
| P269D | Exhaust Aftertreatment Glow Plug Control Circuit Low | Fuel Injection | Medium |
| P269E | Exhaust Aftertreatment Glow Plug Control Circuit High | Fuel Injection | Medium |
| P269F | Exhaust Aftertreatment Glow Plug Circuit/Open | Fuel Injection | Medium |
| P26A0 | Exhaust Aftertreatment Glow Plug Performance | Fuel Metering | Medium |
| P26A1 | Exhaust Aftertreatment Glow Plug Circuit Low | Fuel Metering | Medium |
| P26A2 | Exhaust Aftertreatment Glow Plug Circuit High | Fuel Metering | Medium |
| P26A3 | Engine Coolant Bypass Valve A Range/Performance | Fuel Metering | Medium |
| P26A4 | Engine Coolant Bypass Valve A Position Sensor Circuit | Fuel Metering | Medium |
| P26A5 | Engine Coolant Bypass Valve A Position Sensor Circuit Range/Performance | Fuel Metering | Medium |
| P26A6 | Engine Coolant Bypass Valve A Position Sensor Circuit Low | Fuel Metering | Medium |
| P26A7 | Engine Coolant Bypass Valve A Position Sensor Circuit High | Fuel Metering | Medium |
| P26A8 | Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P26A9 | Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop Performance | Fuel Metering | Medium |
| P26AA | Engine Coolant Bypass Valve A Position Sensor Maximum Stop Performance | Fuel Metering | Medium |
| P26AB | Engine Coolant Bypass Valve A Stuck/Open | Fuel Metering | Medium |
| P26AC | Engine Coolant Bypass Valve B Control Circuit/Open | 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.