OBD2 Fault Code Library

Free lookup for thousands of OBD2 trouble codes: filter by family, read short meanings, and open deeper articles. Desktop ELM327 scanner with live data and AI guidance.

OBD2 symptoms

Look up diagnostic trouble codes by what the car is doing: misfire, overheating, rough idle, a check engine light, and other common symptoms.

P2016 — P2016 — Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, blown fuse feeding the circuit, open or shorted wiring in the circuit.
P2018 — P2018 — Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, poor ground connection, control module driver fault.
P2019 — OBD2 code P2019 flags a problem with the sensor and actuator circuits (intake manifold runner position sensor/switch circuit bank 2). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, corroded, loose or damaged connector, poor ground connection.
P201A — P201A — Reductant Injection Valve Circuit Range/Performance Bank 2 Unit 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, poor ground connection, blown fuse feeding the circuit.
P2020 — P2020 — Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, control module driver fault, corroded, loose or damaged connector.
P2021 — Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2 (P2021): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, blown fuse feeding the circuit, open or shorted wiring in the circuit.
P2024 — OBD2 code P2024 flags a problem with the evaporative emission (EVAP) system (evaporative emissions (EVAP) fuel vapor temperature sensor circuit). The car is usually drivable while you plan the repair. Common culprits: faulty vent valve or leak detection pump, loose, damaged or wrong fuel cap, cracked EVAP hoses or lines.
P2025 — Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Performance (P2025): a powertrain (engine/transmission) fault affecting the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Most often caused by small leak in the fuel tank or filler neck, saturated or damaged charcoal canister, cracked EVAP hoses or lines.
P2026 — Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit Low Voltage (P2026): a powertrain (engine/transmission) fault affecting the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Most often caused by cracked EVAP hoses or lines, faulty vent valve or leak detection pump, saturated or damaged charcoal canister.
P2027 — P2027 — Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit High Voltage. A fault in the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Typical causes: faulty vent valve or leak detection pump, faulty purge valve (canister purge solenoid), small leak in the fuel tank or filler neck.
P2028 — Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit Intermittent (P2028): a powertrain (engine/transmission) fault affecting the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Most often caused by loose, damaged or wrong fuel cap, faulty vent valve or leak detection pump, small leak in the fuel tank or filler neck.
P2029 — Fuel Fired Heater Disabled (P2029): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
P202A — Reductant Tank Heater Control Circuit/Open (P202A): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, control module driver fault, corroded, loose or damaged connector.
P202B — P202B — Reductant Tank Heater Control Circuit Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, poor ground connection, open or shorted wiring in the circuit.
P202C — P202C — Reductant Tank Heater Control Circuit High. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, control module driver fault, open or shorted wiring in the circuit.
P202D — P202D — Reductant Leakage. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, open or shorted wiring in the circuit, blown fuse feeding the circuit.
P202E — Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1 (P202E): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by open or shorted wiring in the circuit, corroded, loose or damaged connector, poor ground connection.
P202F — OBD2 code P202F flags a problem with the sensor and actuator circuits (reductant/regeneration supply control circuit range/performance). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, control module driver fault.
P2030 — Fuel Fired Heater Performance (P2030): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by control module driver fault, blown fuse feeding the circuit, open or shorted wiring in the circuit.
P2031 — P2031 — Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, control module driver fault.
P2032 — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 2 (P2032): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
P2033 — OBD2 code P2033 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit high bank 1 sensor 2). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, control module driver fault.
P2034 — OBD2 code P2034 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit bank 2 sensor 2). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, corroded, loose or damaged connector, open or shorted wiring in the circuit.
P2035 — P2035 — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.