Fuel System Codes
5,039 OBD-II diagnostic trouble codes in this category.
Showing page 30 of 51 (5,039 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P1789 | Pressure Control Solenoid B Short Circuit (Ford) | Engine | High |
| P1790 | TCM A/T TP Sensor Circuit Fault (Acura) | Engine | Medium |
| P1796 | CAN Controller Circuit Bus Off (Jaguar) | Engine | Medium |
| P1798 | CAN TCM INST Circuit Malfunction (Jaguar) | Engine | Medium |
| P1799 | Hold Switch Circuit (Mazda) | Engine | Medium |
| P1801 | Performance Selector Switch Failure (Buick) | Engine | Medium |
| P1804 | Ground Control Relay (Buick) | Engine | Medium |
| P1810 | TFP Valve Position Switch Circuit (Buick) | Engine | Medium |
| P1813 | Torque Control (Buick) | Engine | Medium |
| P1816 | TFP Valve Position Switch Park/Neutral With Drive Ratio (Buick) | Engine | Medium |
| P1817 | TFP Valve Position Switch Reverse With Drive Ratio (Buick) | Engine | Medium |
| P1818 | TFP Valve Position Switch Drive Without Drive Ratio (Buick) | Engine | Medium |
| P1819 | Internal Mode Swtich No Start, Wrong Range (Buick) | Engine | Medium |
| P1820 | Internal Mode Switch Circuit A Low (Buick) | Engine | Medium |
| P1822 | Internal Mode Switch Circuit B High (Buick) | Engine | Medium |
| P1823 | Internal Mode Switch Circuit P Low (Buick) | Engine | Medium |
| P1825 | Internal Mode Switch Illegal Range (Buick) | Engine | Medium |
| P1826 | Internal Mode Switch Circuit C High (Buick) | Engine | Medium |
| P1835 | Kick-Down Switch (Buick) | Engine | Medium |
| P1836 | Kick-Down Switch Failed Open (Buick) | Engine | Medium |
| P1837 | Kick-Down Switch Failed Short (Buick) | Engine | High |
| P1844 | Torque Reduction Signal Circuit Desired By TCM (Buick) | Engine | Medium |
| P1850 | Brake Band Apply Solenoid Circuit (Buick) | Engine | Medium |
| P1851 | Brake Band Apply Solenoid Performance (Buick) | Engine | Medium |
| P1860 | TCC PWM Solenoid Circuit Electrical (Buick) | Engine | Medium |
| P1873 | TCC Stator Temp. Switch Circuit Low (Buick) | Engine | Medium |
| P1874 | TCC Stator Temp. Switch Circuit High (Buick) | Engine | Medium |
| P1875 | 4WD Low Switch Circuit (Buick) | Engine | Medium |
| P1881 | Engine Coolant Level Switch Circuit Failure GEM (Ford) | Cooling System | High |
| P1882 | Engine Coolant Level Switch Circuit Short to Ground (Ford) | Cooling System | High |
| P1883 | Engine Coolant Level Switch Circuit Failure GEM (Ford) | Cooling System | High |
| P1887 | TCC Release Switch Circuit (Buick) | Engine | Medium |
| P1902 | Kickdown Solenoid Relay Control Circuit (Ford) | Engine | Medium |
| P1905 | Pressure Control Solenoid "C" Intermittent Short | Engine | High |
| P1906 | Kickdown Pull Relay Open or Short Circuit to Ground | Engine | High |
| P1907 | Kickdown Hold Relay Open or Short Circuit to Ground | Engine | High |
| P1909 | Trans Temp Sensor Circuit Open or Shorted to Pwr or Gnd | Engine | High |
| P1910 | VFS A Pressure Output Failed Low | Engine | Medium |
| P1912 | VFS C Pressure Output Failed Low | Engine | Medium |
| P1913 | Pressure Switch A Circuit Malfunction | Engine | Medium |
| P1915 | Reverse Switch Circuit Malfunction | Engine | Medium |
| P200A | Intake Manifold Runner Performance Bank 1 | Fuel Injection | Medium |
| P200B | Intake Manifold Runner Performance Bank 2 | Fuel Injection | Medium |
| P2018 | Fuel Pressure Too High Bank 1 | Fuel Pressure | High |
| P2019 | Fuel Pressure Too High Bank 2 | Fuel Pressure | High |
| P201A | Reductant Injection Valve Circuit Range/Performance Bank 2 Unit 1 | Fuel Injection | Medium |
| P201B | Intake Manifold Runner Control Actuator Supply Voltage Low Bank 1 | Fuel Injection | Medium |
| P201C | Intake Manifold Runner Control Actuator Supply Voltage Low Bank 2 | Fuel Injection | Medium |
| P201D | Intake Manifold Runner Control Actuator Internal Performance Bank 1 | Fuel Injection | Medium |
| P201E | Intake Manifold Runner Control Actuator Internal Performance Bank 2 | Fuel Injection | Medium |
| P201F | Reductant Pump A Stuck On | Fuel Injection | Medium |
| P202A | Reductant Tank Heater Control Circuit/Open | Fuel Injection | Medium |
| P202B | Reductant Tank Heater Control Circuit Low | Fuel Injection | Medium |
| P202C | Reductant Tank Heater Control Circuit High | Fuel Injection | Medium |
| P202D | Reductant Leakage | Fuel Injection | Medium |
| P202E | Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1 | Fuel Injection | Medium |
| P202F | Reductant/Regeneration Supply Control Circuit Range/Performance | Fuel Injection | Medium |
| P203A | Reductant Level Sensor A Circuit | Fuel Injection | Medium |
| P203B | Reductant Level Sensor A Circuit Range/Performance | Fuel Injection | Medium |
| P203C | Reductant Level Sensor A Circuit Low | Fuel Injection | Medium |
| P203D | Reductant Level Sensor A Circuit High | Fuel Injection | Medium |
| P203E | Reductant Level Sensor A Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P203F | Reductant Level Too Low | Fuel Injection | Medium |
| P204A | Reductant Pressure Sensor Circuit | Fuel Injection | Medium |
| P204B | Reductant Pressure Sensor Circuit Range/Performance | Fuel Injection | Medium |
| P204C | Reductant Pressure Sensor Circuit Low | Fuel Injection | Medium |
| P204D | Reductant Pressure Sensor Circuit High | Fuel Injection | Medium |
| P204E | Reductant Pressure Sensor Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P204F | Reductant System Performance Bank 1 | Fuel Injection | Medium |
| P205A | Reductant Tank Temperature Sensor A Circuit | Fuel Injection | Medium |
| P205B | Reductant Tank Temperature Sensor A Circuit Range/Performance | Fuel Injection | Medium |
| P205C | Reductant Tank Temperature Sensor A Circuit Low | Fuel Injection | Medium |
| P205D | Reductant Tank Temperature Sensor A Circuit High | Fuel Injection | Medium |
| P205E | Reductant Tank Temperature Sensor A Circuit Intermittent/Erratic | Fuel Injection | Medium |
| P205F | Reductant System Performance Bank 2 | Fuel Injection | Medium |
| P2065 | Fuel Level Sensor B Circuit | Fuel Level | Medium |
| P2066 | Fuel Level Sensor B Circuit Range/Performance | Fuel Level | Medium |
| P2067 | Fuel Level Sensor B Circuit Low Input | Fuel Level | Medium |
| P2068 | Fuel Level Sensor B Circuit High Input | Fuel Level | Medium |
| P2069 | Fuel Level Sensor B Circuit Intermittent | Fuel Level | Low |
| P206A | Reductant Quality Sensor Circuit | Fuel Injection | Medium |
| P206B | Reductant Quality Sensor Circuit Range/Performance | Fuel Injection | Medium |
| P206C | Reductant Quality Sensor Circuit Low | Fuel Injection | Medium |
| P206D | Reductant Quality Sensor Circuit High | Fuel Injection | Medium |
| P206E | Intake Manifold Tuning (IMT) Valve Stuck Open Bank 2 | Fuel Injection | Medium |
| P206F | Intake Manifold Tuning (IMT) Valve Stuck Closed Bank 2 | Fuel Injection | Medium |
| P207A | Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Bank 2 | Fuel Injection | Medium |
| P207B | Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Range/Performance Bank 2 | Fuel Injection | Medium |
| P207C | Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low Bank 2 | Fuel Injection | Medium |
| P207D | Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High Bank 2 | Fuel Injection | Medium |
| P207E | Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Intermittent Bank 2 | Fuel Injection | Medium |
| P207F | Reductant Quality Performance | Fuel Injection | Medium |
| P208A | Reductant Pump A Control Circuit/Open | Fuel Injection | Medium |
| P208B | Reductant Pump A Control Performance/Stuck Off | Fuel Injection | Medium |
| P208C | Reductant Pump A Control Circuit Low | Fuel Injection | Medium |
| P208D | Reductant Pump A Control Circuit High | Fuel Injection | Medium |
| P208E | Reductant Injection Valve Stuck Closed Bank 1 Unit 1 | Fuel Injection | Medium |
| P208F | Reductant Injection Valve Stuck Closed Bank 2 Unit 1 | Fuel Injection | Medium |
| P209A | Reductant Injection Air Pressure Sensor B Circuit | Fuel Injection | Medium |
| P209B | Reductant Injection Air Pressure Sensor B Circuit Range/Performance | 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.