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.

• Engine misfire
• Engine overheating
• Rough idle
• Check engine light
• Poor fuel economy
• Hard starting
• Engine stalling
• Catalytic converter efficiency
• Oxygen sensor fault
• EVAP leak
• Thermostat not reaching temperature
• Lean air-fuel mixture
• Rich air-fuel mixture
• EGR flow fault
• Engine knock
• Charging system
• Throttle position
• Mass airflow sensor
• Turbo underboost
• Coolant temperature sensor
• Transmission fault

• P1184 — OBD2 code P1184 flags a problem with the sensor and actuator circuits (( open )). 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, poor ground connection.
• P1185 — OBD2 code P1185 flags a problem with the sensor and actuator circuits (fuel delivery system malfunction - low). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, poor ground connection.
• P1187 — P1187 — Fuel Shut Off Solenoid Malfunction. 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, blown fuse feeding the circuit.
• P1188 — Engine Oil Temperature Circuit Malfunction (P1188): 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.
• P1189 — OBD2 code P1189 flags a problem with the sensor and actuator circuits (engine oil temperature out of self test range). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P1190 — OBD2 code P1190 flags a problem with the fuel delivery and mixture control (FTS high - fuel pump temperature sensor high). 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.
• P1191 — FTS Low - Fuel Pump Temperature Sensor Low (P1191): 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 faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, clogged or leaking fuel injectors.
• P1192 — OBD2 code P1192 flags a problem with the sensor and actuator circuits (variant selection). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, corroded, loose or damaged connector, control module driver fault.
• P1193 — OBD2 code P1193 flags a problem with the sensor and actuator circuits (calibration memory fault). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P1194 — OBD2 code P1194 flags a problem with the sensor and actuator circuits (pump speed signal fault). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, poor ground connection.
• P1195 — P1195 — Calibration Resistor Out Of Range. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, poor ground connection.
• P1196 — Key Line Voltage (P1196): 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, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P1197 — OBD2 code P1197 flags a problem with the sensor and actuator circuits (voltage external). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, faulty sensor or actuator of the affected circuit.
• P1198 — OBD2 code P1198 flags a problem with the exhaust gas recirculation (EGR) system (EGR drive overcurrent). The car is usually drivable while you plan the repair. Common culprits: faulty EGR solenoid or wiring, ECM control circuit fault, failed EGR valve or position sensor.
• P1199 — OBD2 code P1199 flags a problem with the sensor and actuator circuits (ECU A/D converter). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• P1200 — OBD2 code P1200 flags a problem with the sensor and actuator circuits (SCP HBCC failed to initialize). 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.
• P1201 — OBD2 code P1201 flags a problem with the sensor and actuator circuits (key off voltage high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, poor ground connection.
• P1203 — Pump Rotor Control Underfueling (P1203): 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, open or shorted wiring in the circuit, poor ground connection.
• P1204 — OBD2 code P1204 flags a problem with the fuel delivery and mixture control (fuel level input 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.
• P1205 — OBD2 code P1205 flags a problem with the fuel delivery and mixture control (injector control circuit). Short, gentle driving to a shop is usually possible. Common culprits: weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture.
• P1206 — P1206 — Injector Circuit Open / Shorted - Cylinder #1. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, clogged or leaking fuel injectors, weak fuel pump or clogged fuel filter.
• P1207 — P1207 — Cylinder 7 Injector Short Circuit. P1207 can cause a cylinder 7 misfire, reduced power, and fuel-system damage if ignored.
• P1208 — P1208 — Cylinder 8 Injector Short-Circuit Fault. P1208 warrants prompt diagnosis. If the engine runs smoothly with no strong fuel odor, a short trip may be possible, but heavy acceleration should be avoided because an uncorrected cylinder #8 misfire can overrich the.
• P1209 — P1209 — Injector Circuit Open / Shorted - Cylinder #2. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors, weak fuel pump or clogged fuel filter.