Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 39 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P26AD | Engine Coolant Bypass Valve B Control Circuit Low | Fuel Metering | Medium |
| P26AE | Engine Coolant Bypass Valve B Control Circuit High | Fuel Metering | Medium |
| P26AF | Engine Coolant Bypass Valve B Stuck/Open | Fuel Metering | Medium |
| P26B0 | Engine Coolant Bypass Valve B Range/Performance | Fuel Metering | Medium |
| P26B1 | Engine Coolant Bypass Valve A Stuck Closed | Fuel Metering | Medium |
| P26B2 | Engine Coolant Bypass Valve B Stuck Closed | Fuel Metering | Medium |
| P26B3 | Fuel Shutoff Valve A Control Circuit Performance/Stuck Off | Fuel Metering | Medium |
| P26B4 | Fuel Shutoff Valve A Control Circuit Stuck On | Fuel Metering | Medium |
| P26B5 | Fuel Shutoff Valve B Control Circuit Performance/Stuck Off | Fuel Metering | Medium |
| P26B6 | Fuel Shutoff Valve B Control Circuit Stuck On | Fuel Metering | Medium |
| P26B7 | Engine Coolant Bypass Valve C Control Circuit/Open | Fuel Metering | Medium |
| P26B8 | Engine Coolant Bypass Valve C Control Circuit Low | Fuel Metering | Medium |
| P26B9 | Engine Coolant Bypass Valve C Control Circuit High | Fuel Metering | Medium |
| P26BA | Engine Coolant Bypass Valve C Stuck/Open | Fuel Metering | Medium |
| P26BB | Engine Coolant Bypass Valve C Range/Performance | Fuel Metering | Medium |
| P26BC | Engine Coolant Bypass Valve C Stuck Closed | Fuel Metering | Medium |
| P26BD | Engine Coolant Bypass Valve D Control Circuit/Open | Fuel Metering | Medium |
| P26BE | Engine Coolant Bypass Valve D Control Circuit Low | Fuel Metering | Medium |
| P26BF | Engine Coolant Bypass Valve D Control Circuit High | Fuel Metering | Medium |
| P26C0 | Engine Coolant Bypass Valve D Stuck/Open | Fuel Metering | Medium |
| P26C1 | Engine Coolant Bypass Valve D Range/Performance | Fuel Metering | Medium |
| P26C2 | Engine Coolant Bypass Valve D Stuck Closed | Fuel Metering | Medium |
| P26C3 | Internal Control Module Transmission Range Sensor Performance | Fuel Metering | Medium |
| P26C4 | Internal Control Module Clutch Pedal Performance | Fuel Metering | Medium |
| P26C5 | Exhaust Flow Control Valve A Control Circuit/Open | Fuel Metering | Medium |
| P26C6 | Exhaust Flow Control Valve A Control Circuit Low | Fuel Metering | Medium |
| P26C7 | Exhaust Flow Control Valve A Control Circuit High | Fuel Metering | Medium |
| P26C8 | Chassis Control Module 1 Requested MIL Illumination | Fuel Metering | Medium |
| P26C9 | Chassis Control Module 2 Requested MIL Illumination | Fuel Metering | Medium |
| P26CA | Engine Coolant Pump Control Circuit/Open | Fuel Metering | Medium |
| P26CB | Engine Coolant Pump Performance/Stuck Off | Fuel Metering | Medium |
| P26CC | Engine Coolant Pump Control Circuit Low | Fuel Metering | Medium |
| P26CD | Engine Coolant Pump Control Circuit High | Fuel Metering | Medium |
| P26CE | Engine Coolant Pump Overspeed/Air In System | Fuel Metering | Medium |
| P26CF | Engine Coolant Pump Control Module System Voltage | Fuel Metering | Medium |
| P26D0 | Engine Coolant Pump Control Module System Voltage Low | Fuel Metering | Medium |
| P26D1 | Engine Coolant Pump Control Module System Voltage High | Fuel Metering | Medium |
| P26D2 | Engine Coolant Pump Control Module Over Temperature | Fuel Metering | Medium |
| P26D3 | Engine Coolant Pump Supply Voltage Circuit | Fuel Metering | Medium |
| P26D4 | Engine Coolant Pump Supply Voltage Circuit Low | Fuel Metering | Medium |
| P26D5 | Engine Coolant Pump Supply Voltage Circuit High | Fuel Metering | Medium |
| P26D6 | Engine Coolant Pump Clutch Control Circuit/Open | Fuel Metering | Medium |
| P26D7 | Engine Coolant Pump Clutch Performance/Stuck Off | Fuel Metering | Medium |
| P26D8 | Engine Coolant Pump Clutch Stuck On | Fuel Metering | Medium |
| P26D9 | Engine Coolant Pump Clutch Control Circuit Low | Fuel Metering | Medium |
| P26DA | Engine Coolant Pump Clutch Control Circuit High | Fuel Metering | Medium |
| P26DB | Engine Sound Control A Circuit/Open | Fuel Metering | Medium |
| P26DC | Engine Sound Control A Circuit Low | Fuel Metering | Medium |
| P26DD | Engine Sound Control A Circuit High | Fuel Metering | Medium |
| P26DE | Engine Sound Control A Circuit Performance | Fuel Metering | Medium |
| P26DF | Sensor Power Supply D Circuit/Open | Fuel Metering | Medium |
| P26E0 | Sensor Power Supply D Circuit Low | Fuel Metering | Medium |
| P26E1 | Sensor Power Supply D Circuit High | Fuel Injection | Medium |
| P26E3 | Fuel Mode Indicator Lamp Control Circuit High | Fuel System | Medium |
| P26EA | Fuel Pump Control Module B | Fuel Metering | Medium |
| P26EB | Alternative Fuel Control Module System Voltage | Fuel Metering | Medium |
| P26EC | Engine Sound Control B Circuit/Open | Fuel Metering | Medium |
| P26ED | Engine Sound Control B Circuit Low | Fuel Metering | Medium |
| P26EE | Engine Sound Control B Circuit High | Fuel Metering | Medium |
| P26EF | Engine Sound Control B Circuit Performance | Fuel Metering | Medium |
| P26F0 | Starter Relay A Stuck On | Fuel Metering | Medium |
| P26F1 | Starter Relay A Stuck Off | Fuel Metering | Medium |
| P26F2 | Starter Relay B Stuck On | Fuel Metering | Medium |
| P26F3 | Starter Relay B Stuck Off | Fuel Metering | Medium |
| P26F4 | Coolant Pump C Control Circuit/Open | Fuel Metering | Medium |
| P26F5 | Coolant Pump C Control Circuit Low | Fuel Metering | Medium |
| P26F6 | Coolant Pump C Control Circuit High | Fuel Metering | Medium |
| P26F7 | Coolant Pump C Supply Voltage Circuit | Fuel Metering | Medium |
| P26F8 | Coolant Pump C Stuck/Stalled | Fuel Metering | Medium |
| P26F9 | Coolant Pump C Control Module Overtemperature | Fuel Metering | Medium |
| P26FA | Coolant Pump C Overspeed/Air in System | Fuel Metering | Medium |
| P26FB | EGR Cooler Bypass Control Stuck Closed Bank 1 | Fuel Metering | Medium |
| P26FC | EGR Cooler Bypass Control Stuck Closed Bank 2 | Fuel Metering | Medium |
| P26FD | A/C Compressor Internal Control Module Performance | Fuel Metering | Medium |
| P26FE | Exhaust Flow Control Valve A Control Performance | Fuel Metering | Medium |
| P26FF | Auto Configuration Throttle Input Not Present Bank 2 | Fuel Metering | Medium |
| P270A | Transmission Friction Element A Temperature Too High | Fuel Injection | Medium |
| P270B | Transmission Friction Element B Temperature Too High | Fuel Injection | Medium |
| P270C | Transmission Friction Element C Temperature Too High | Fuel Injection | Medium |
| P270D | Transmission Friction Element D Temperature Too High | Fuel Injection | Medium |
| P270E | Transmission Friction Element E Temperature Too High | Fuel Injection | Medium |
| P270F | Transmission Friction Element F Temperature Too High | Fuel Injection | Medium |
| P271A | Park Pawl Position Sensor A Circuit Low | Fuel Injection | Medium |
| P271B | Park Pawl Position Sensor A Circuit High | Fuel Injection | Medium |
| P271C | Park Pawl Position Sensor B Circuit Low | Fuel Injection | Medium |
| P271D | Park Pawl Position Sensor B Circuit High | Fuel Injection | Medium |
| P271E | Transmission Performance | Fuel Injection | Medium |
| P271F | Electronic Gear Shift - Position Not Learned | Fuel Injection | Medium |
| P272A | Transmission Range Select Motor Control Circuit | Fuel Injection | Medium |
| P272B | Transmission Range Select Motor Control Circuit Current Too High | Fuel Injection | Medium |
| P272C | Park Pawl Motor Control Circuit | Fuel Injection | Medium |
| P272D | Park Pawl Motor Control Circuit Current Too High | Fuel Injection | Medium |
| P273A | Transmission Friction Element G Apply Time Range/Performance | Fuel Injection | Medium |
| P273B | Transmission Friction Element H Apply Time Range/Performance | Fuel Injection | Medium |
| P273C | Gear Shift Control Module A Supply Voltage Low | Fuel Injection | Medium |
| P273D | Gear Shift Control Module A Supply Voltage High | Fuel Injection | Medium |
| P274A | Transmission Fluid Temperature Sensor C Circuit | Fuel Injection | Medium |
| P274B | Transmission Fluid Temperature Sensor C Circuit Range/Performance | Fuel Injection | Medium |
| P274C | Transmission Fluid Temperature Sensor C Circuit Low | Fuel Injection | Medium |
| P274D | Transmission Fluid Temperature Sensor C Circuit High | Fuel Injection | 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.