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.

P216E — OBD2 code P216E flags a problem with the fuel delivery and mixture control (fuel injector group "F" supply voltage circuit low). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel, faulty fuel pressure regulator.
P216F — P216F — Fuel Injector Group "F" Supply Voltage Circuit High. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel rail pressure sensor or wiring, clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture.
P2170 — P2170 — Exhaust Pressure Regulator Vent Solenoid Control Circuit Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
P2172 — OBD2 code P2172 flags a problem with the throttle and intake air metering (throttle actuator control system - sudden high air flow detected). Short, gentle driving to a shop is usually possible. Common culprits: wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor, contaminated or failed MAF/MAP sensor.
P2173 — Throttle Actuator Control System - High Air Flow Detected (P2173): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor, failed electronic throttle motor.
P2174 — Throttle Actuator Control System - Sudden Low Air Flow Detected (P2174): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by intake air leaks after the MAF sensor, contaminated or failed MAF/MAP sensor, dirty throttle body or stuck throttle plate.
P2175 — P2175 — Throttle Actuator Control System - Low Air Flow Detected. A fault in the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Typical causes: faulty throttle position sensor or pedal sensor, failed electronic throttle motor, intake air leaks after the MAF sensor.
P2179 — OBD2 code P2179 flags a problem with the sensor and actuator circuits (system too lean off idle bank 2). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, open or shorted wiring in the circuit, poor ground connection.
P217A — P217A — Fuel Injector Group "G" Supply Voltage Circuit/Open. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
P217B — OBD2 code P217B flags a problem with the fuel delivery and mixture control (fuel injector group "G" supply voltage circuit low). Short, gentle driving to a shop is usually possible. Common culprits: clogged or leaking fuel injectors, faulty fuel pressure regulator, vacuum or intake leaks skewing the mixture.
P217C — P217C — Fuel Injector Group "G" Supply Voltage Circuit High. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring, clogged or leaking fuel injectors.
P217D — P217D — Fuel Injector Group "H" Supply Voltage Circuit/Open. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, vacuum or intake leaks skewing the mixture.
P217E — OBD2 code P217E flags a problem with the fuel delivery and mixture control (fuel injector group "H" supply voltage circuit low). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring.
P217F — Fuel Injector Group "H" Supply Voltage Circuit High (P217F): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by contaminated or incorrect fuel, faulty fuel pressure regulator, clogged or leaking fuel injectors.
P2180 — OBD2 code P2180 flags a problem with the sensor and actuator circuits (system too rich off idle bank 2). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, control module driver fault.
P2182 — OBD2 code P2182 flags a problem with the engine cooling and temperature control (engine coolant temperature sensor 2 circuit). Short, gentle driving to a shop is usually possible. Common culprits: water pump or radiator issues, wiring faults in the sensor circuit, low coolant level or air in the system.
P2183 — P2183 — Engine Coolant Temperature Sensor 2 Circuit Range/Performance. A fault in the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Typical causes: water pump or radiator issues, wiring faults in the sensor circuit, thermostat stuck open or closed.
P2184 — P2184 — Engine Coolant Temperature Sensor 2 Circuit Low. A fault in the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Typical causes: water pump or radiator issues, thermostat stuck open or closed, low coolant level or air in the system.
P2185 — OBD2 code P2185 flags a problem with the engine cooling and temperature control (engine coolant temperature sensor 2 circuit high). Short, gentle driving to a shop is usually possible. Common culprits: failed cooling fan or fan relay, wiring faults in the sensor circuit, thermostat stuck open or closed.
P2186 — OBD2 code P2186 flags a problem with the engine cooling and temperature control (engine coolant temperature sensor 2 circuit interm/erratic). Short, gentle driving to a shop is usually possible. Common culprits: wiring faults in the sensor circuit, thermostat stuck open or closed, failed cooling fan or fan relay.
P2189 — System Too Lean at Idle Bank 2 (P2189): 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
P2190 — OBD2 code P2190 flags a problem with the sensor and actuator circuits (system too rich at idle bank 2). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, control module driver fault.
P2191 — P2191 — System Too Lean at Higher Load Bank 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, blown fuse feeding the circuit, control module driver fault.
P2192 — P2192 — System Too Rich at Higher Load 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, control module driver fault, poor ground connection.