Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 26 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P0EC3 | A/C Refrigerant Temperature Sensor B Circuit Low | Fuel Metering | Medium |
| P0EC4 | A/C Refrigerant Temperature Sensor B Range/Performance | Fuel Metering | Medium |
| P0EC5 | A/C Compressor Motor Speed Sensor Range/Performance | Fuel Metering | Medium |
| P0EC6 | A/C Power Supply Relay Control Circuit/Open | Fuel Metering | Medium |
| P0EC7 | A/C Power Supply Relay Control Circuit Low | Fuel Metering | Medium |
| P0EC8 | A/C Power Supply Relay Control Circuit High | Fuel Metering | Medium |
| P0EC9 | A/C Refrigerant Distribution Valve A Stuck/Open | Fuel Metering | Medium |
| P0ECA | Hybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation | Fuel Metering | Medium |
| P0ECB | Hybrid/EV Battery Voltage Sensor System - Multiple Sensor Correlation | Fuel Metering | Medium |
| P0ECC | Hybrid/EV Battery E Voltage | Fuel Metering | Medium |
| P0ECD | Hybrid/EV Battery E Voltage Unstable | Fuel Metering | Medium |
| P0ECE | Hybrid/EV Battery E Voltage Low | Fuel Metering | Medium |
| P0ECF | Hybrid/EV Battery E Voltage High | Fuel Metering | Medium |
| P0ED0 | Hybrid/EV Battery F Voltage | Fuel Metering | Medium |
| P0ED1 | Hybrid/EV Battery F Voltage Unstable | Fuel Metering | Medium |
| P0ED2 | Hybrid/EV Battery F Voltage Low | Fuel Metering | Medium |
| P0ED3 | Hybrid/EV Battery F Voltage High | Fuel Metering | Medium |
| P0ED4 | Generator Phase X Current | Fuel Metering | Medium |
| P0ED5 | Generator Phase X Current Low | Fuel Metering | Medium |
| P0ED6 | Generator Phase X Current High | Fuel Metering | Medium |
| P0ED7 | Generator Phase Y Current | Fuel Metering | Medium |
| P0ED8 | Generator Phase Y Current Low | Fuel Metering | Medium |
| P0ED9 | Generator Phase Y Current High | Fuel Metering | Medium |
| P0EDA | Generator Phase Z Current | Fuel Metering | Medium |
| P0EDB | Generator Phase Z Current Low | Fuel Metering | Medium |
| P0EDC | Generator Phase Z Current High | Fuel Metering | Medium |
| P0EDD | Hybrid/EV Battery Pack B Deterioration | Fuel Metering | Medium |
| P0EDE | Hybrid/EV Battery Pack C Deterioration | Fuel Metering | Medium |
| P0EDF | Hybrid/EV Battery Pack D Deterioration | Fuel Metering | Medium |
| P0EE0 | Hybrid/EV Battery Pack E Deterioration | Fuel Metering | Medium |
| P0EE1 | Hybrid/EV Battery Pack F Deterioration | Fuel Metering | Medium |
| P0EE2 | A/C Refrigerant Distribution Valve B Stuck/Open | Fuel Metering | Medium |
| P0EE3 | A/C Refrigerant Distribution Valve B Control Circuit/Open | Fuel Metering | Medium |
| P0EE4 | A/C Refrigerant Distribution Valve B Control Circuit Low | Fuel Metering | Medium |
| P0EE5 | A/C Refrigerant Distribution Valve B Control Circuit High | Fuel Metering | Medium |
| P0EE6 | A/C Refrigerant Distribution Valve B Control Circuit Driver Current/Temperature Too High | Fuel Metering | Medium |
| P0EE7 | Battery Charger Coupler Temperature Sensor B Circuit | Fuel Metering | Medium |
| P0EE8 | Battery Charger Coupler Temperature Sensor B Circuit Range/Performance | Fuel Metering | Medium |
| P0EE9 | Battery Charger Coupler Temperature Sensor B Circuit Low | Fuel Metering | Medium |
| P0EEA | Battery Charger Coupler Temperature Sensor B Circuit High | Fuel Metering | Medium |
| P0EEB | Battery Charger Coupler Temperature Sensor B Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P0EEC | Battery Energy Control Module B Performance | Fuel Metering | Medium |
| P0EED | Hybrid/EV Battery System Discharge Circuit Performance | Fuel Metering | Medium |
| P0EEE | Battery Charger Coupler Temperature B Too High | Fuel Metering | Medium |
| P0EEF | Drive Motor A Control Module Overtemperature | Fuel Metering | Medium |
| P0EF0 | Battery Charger Coupler Unlock Disabled - High Voltage Present | Fuel Metering | Medium |
| P0EF1 | Drive Motor C Temperature Sensor Circuit | Fuel Metering | Medium |
| P0EF2 | Drive Motor C Temperature Sensor Range/Performance | Fuel Metering | Medium |
| P0EF3 | Drive Motor C Temperature Sensor Circuit Low | Fuel Metering | Medium |
| P0EF4 | Drive Motor C Temperature Sensor Circuit High | Fuel Metering | Medium |
| P0EF5 | Drive Motor C Temperature Sensor Circuit Intermittent/Erratic | Fuel Metering | Medium |
| P0EF6 | Drive Motor C Temperature Sensor Over Temperature | Fuel Metering | Medium |
| P0EF7 | Battery Charger A Input Voltage Sensor B Circuit | Fuel Metering | Medium |
| P0EF8 | Battery Charger A Input Voltage Sensor B Circuit Range/Performance | Fuel Metering | Medium |
| P0EF9 | Battery Charger A Input Voltage Sensor B Circuit Low | Fuel Metering | Medium |
| P0EFA | Battery Charger A Input Voltage Sensor B Circuit High | Fuel Metering | Medium |
| P0EFB | Battery Charger A Input Voltage Sensor C Circuit | Fuel Metering | Medium |
| P0EFC | Battery Charger A Input Voltage Sensor C Circuit Range/Performance | Fuel Metering | Medium |
| P0EFD | Battery Charger A Input Voltage Sensor C Circuit Low | Fuel Metering | Medium |
| P0EFE | Battery Charger A Input Voltage Sensor C Circuit High | Fuel Metering | Medium |
| P1001 | KOER Test Cannot Be Completed (Ford) | Engine | Medium |
| P1031 | HO2S Heater Current Monitor Control Circuit Sensors 1 (Buick) | Oxygen Sensor | Medium |
| P1032 | HO2S Heater Warm Up Control Circuit Sensors 1 (Buick) | Oxygen Sensor | Medium |
| P1051 | Brake Switch Signal Missing or Improper (Ford) | Engine | Medium |
| P1083 | Fuel Control Mixture Lean Bank 1 Sensor 1 (Bmw) | Fuel Delivery | Medium |
| P1084 | Fuel Control Mixture Rich Bank 1 Sensor 1 (Bmw) | Fuel Delivery | Medium |
| P1085 | Fuel Control Mixture Lean Bank 2 Sensor 1 (Bmw) | Fuel Delivery | Medium |
| P1086 | Fuel Control Mixture Rich Bank 2 Sensor 1 (Bmw) | Fuel Delivery | Medium |
| P1087 | O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1088 | O2 Sensor Circuit Slow Response in Rich Control Range Bank 1 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1089 | O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 2 (Bmw) | Oxygen Sensor | Medium |
| P1094 | O2 Sensor Circuit Slow Response in Rich Control Range Bank 2 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1095 | O2 Sensor Circuit Slow Switching From Lean to Rich Bank 1 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1096 | O2 Sensor Circuit Slow Switching From Lean to Rich Bank 2 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1097 | O2 Sensor Circuit Slow Response After Coast Down Fuel Cut-off Bank 1 Sensor 2 (Bmw) | Oxygen Sensor | Medium |
| P1098 | O2 Sensor Circuit Slow Response After Coast Down Fuel Cutoff Bank 2 Sensor 2 (Bmw) | Oxygen Sensor | Medium |
| P1102 | HO2S11 Heater Circuit High Voltage (Kia) | Oxygen Sensor | Medium |
| P1105 | Secondary Vacuum Sensor Circuit (Buick) | Engine | Medium |
| P1106 | BARO Circuit Range Performance Malfunction (Acura) | Engine | Medium |
| P1107 | BARO Circuit Low Input (Acura) | Engine | Medium |
| P1108 | BARO Circuit High Input (Acura) | Engine | Medium |
| P1111 | Engine Coolant Temperature Radiator Outlet Sensor Low Input (Bmw) | Cooling System | High |
| P1112 | Engine Coolant Temperature Radiator Outlet Sensor High Input (Bmw) | Cooling System | High |
| P1114 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage (Buick) | Cooling System | High |
| P1115 | Coolant Temperature Sensor Plausibility (Bmw) | Cooling System | High |
| P1116 | Mass Or Volume Air Flow Circuit Range Performance Problem Bank 2 (Bmw) | Engine | Medium |
| P1117 | Mass Or Volume Air Flow Circuit Low Input Bank 2 (Bmw) | Engine | Medium |
| P1118 | Mass Or Volume Air Flow Circuit High Input Bank 2 (Bmw) | Engine | Medium |
| P1119 | ECT Signal Out Of Rage With TFT Sensor (Buick) | Engine | Medium |
| P1127 | Exhaust Not Warm Enough Downstream O2 Sensor Not Tested (Ford) | Oxygen Sensor | Medium |
| P1130 | Lack Of HO2S Switch - Adaptive Fuel At Limit | Fuel System | Medium |
| P1132 | O2 Sensor Heater Control Circuit Bank 1 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1134 | O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1136 | O2 Sensor Heater Circuit High Voltage Bank 1 Sensor 1 (Bmw) | Oxygen Sensor | Medium |
| P1137 | O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2 (Bmw) | Oxygen Sensor | Medium |
| P1138 | O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2 (Bmw) | Oxygen Sensor | Medium |
| P1139 | O2 Sensor Heater Circuit High Voltage Bank 1 Sensor 2 (Bmw) | Oxygen Sensor | Medium |
| P1140 | Mass Or Volume Air Flow Circuit Range Performance Problem (Bmw) | Engine | Medium |
| P1141 | HO2S Bank 1 Sensor 2 Average Voltage Level (Buick) | Oxygen Sensor | Medium |
| P1142 | Fuel Restriction Condition (Ford) | Fuel Delivery | 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.