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Subaru fault codes: probable meanings

Codes specific to Subaru (often P1xxx, B1xxx, C1xxx, U1xxx). The manufacturer does not publish these meanings: they come from an open database and remain probable. The same code can have another meaning depending on the model or the year.

Codes: 93, from smallest to largest.

CodeProbable meaning
P1086Tumble Generator Valve #2 LH Position Sensor Circuit Low Input
P1087Tumble Generator Valve #2 LH Position Sensor Circuit High Input
P1088Tumble Generator Valve #1 RH Position Sensor Circuit Low Input
P1089Tumble Generator Valve #1 RH Position Sensor Circuit High Input
P1090Tumble Generator Valve #1 RH Malfunction Stuck Open
P1091Tumble Generator Valve #1 RH Malfunction Stuck Close
P1092Tumble Generator Valve #2 LH Malfunction Stuck Open
P1093Tumble Generator Valve #2 LH Malfunction Stuck Close
P1094Tumble Generator Valve Circuit #1 Open Circuit
P1095Tumble Generator Valve Circuit #1 Over Current
P1096Tumble Generator Valve Circuit #2 Open Circuit
P1097Tumble Generator Valve Circuit #2 Over Current
P1100Starter Switch Circuit Malfunction
P1101Neutral Position Switch Circuit Malfunction M/T
P1102Pressure Sources Solenoid Valve Circuit Malfunction
P1103Pressure Sources Switching Solenoid Valve Circuit
P1104Engine Torque Control Signal Circuit Malfunction
P1106Engine Torque Control Signal 2 Circuit Malfunction
P1107AIR System Diagnosis Solenoid Circuit Fault
P1110Atmospheric Pressure Sensor Low Input
P1111Atmospheric Pressure Sensor High Input
P1112Atmospheric Pressure Sensor Range Performance Problem
P1115Engine Torque Control Cut Signal Circuit High Input
P1116Engine Torque Control Cut Signal Circuit Low Input
P1120Starter Switch High Input
P1121Neutral Position Switch Circuit Low Input AT Vehicles
P1122Pressure Sources Switching Valve Circuit High Input
P1124TCS Signal Circuit High Input
P1130Front Oxygen Sensor Circuit Malfunction Open Circuit
P1131Front Oxygen Sensor Circuit Malfunction Short Circuit
P1134Front Oxygen AF Sensor Microcomputer Problem
P1137Front Oxygen AF Sensor Circuit Range Performance Problem
P1139Front Oxygen AF Sensor #1 Heater Circuit Performance Range Problem
P1141Mass Air Flow Sensor Circuit High Input
P1142Mass Air Flow Sensor Circuit Low Input
P1143Pressure Sensor Circuit Low Input
P1144Pressure Sensor Circuit High Input
P1146Pressure Sensor Circuit Range Performance Problem High Input
P1150Front Oxygen Sensor Heater Circuit High Input
P1151Rear Oxygen Sensor Heater Circuit High Input
P1230Fuel Pump Control Unit Malfunction
P1244Wastegate Control Solenoid Valve Malfunction Low Input
P1245Wastegate Control Solenoid Valve Malfunction Fail Safe
P1301Fire Due To Increased Exhaust Temperature
P1312Exhaust Temperature Sensor Malfunction
P1325Knock Sensor Circuit Low Input
P1400Fuel Tank Pressure Control Solenoid Low Input
P1401Fuel Tank Pressure Control System Performance
P1402Fuel Level Pressure Sensor Circuit Fault
P1420Fuel Tank Pressure Control Solenoid High Input
P1421Exhaust Gas Recirculation Circuit High Input
P1422EVAP Purge Control Solenoid Valve Circuit High Input
P1423EVAP Vent Control High Input
P1440Fuel Tank Pressure Control System Low Input
P1441Fuel Tank Pressure Control System High Input
P1442Fuel Level Sensor Circuit Range Performance
P1443EVAP Control System Vent Control Function Problem
P1480Cooling Fan Relay 1 Circuit High Input
P1500Radiator Fan Relay 1 Circuit Malfunction
P1501Idle Control System Malfunction Fail Safe
P1502Radiator Fan Function Problem
P1507Idle Control System Malfunction Fail Safe
P1510Idle Air Control Solenoid Signal 1 Circuit Low Input
P1511Idle Air Control Solenoid Signal 1 Circuit High Input
P1512Idle Air Control Solenoid Signal 2 Circuit Low Input
P1513Idle Air Control Solenoid Signal 2 Circuit High Input
P1514Idle Air Control Solenoid Signal 3 Circuit Low Input
P1515Idle Air Control Solenoid Signal 3 Circuit High Input
P1516Idle Air Control Solenoid Signal 4 Circuit Low Input
P1517Idle Air Control Solenoid Signal 4 Circuit High Input
P1518Starter Switch Circuit Low Input
P1520Radiator Fan Relay 1 Circuit High Input
P1540Vehicle Speed Sensor Malfunction
P1544High Exhaust Temperature Detected
P1560Back-Up Voltage Circuit Malfunction
P1590Neutral Position Switch Circuit High Input
P1591Neutral Position Switch Circuit Low Input
P1592Neutral Position Switch Circuit MT Model
P1594Automatic Transmission Diagnosis Input Signal Circuit Malfunction
P1595Automatic Transmission Diagnosis Input Signal Circuit Low Input
P1596Automatic Transmission Diagnosis Input Signal Circuit High Input
P1698Engine Torque Control Cut Signal Circuit Low Input
P1699Engine Torque Control Cut Signal Circuit High Input
P1700Throttle Position Sensor Circuit Malfunction AT
P1701Cruise Control Set Signal Circuit Malfunction AT
P1702Auto Trans Diagnosis Input Signal Circuit
P1703Low Clutch Timing Control Solenoid Valve Circuit Malfunction
P17042-4 Brake Timing Solenoid Valve Circuit Malfunction
P17052-4 Brake Pressure Solenoid Valve Solenoid D Circuit
P1711Engine Torque Control Signal 1 Circuit Malfunction
P1712Engine Torque Control Signal 2 Circuit Malfunction
P1722Auto Trans Diagnosis Input Signal High Input
P1742Auto Trans Diagnosis Input Signal Malfunction

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Official meanings: OBDex (public domain, CC0). Manufacturer codes: dtc-database (MIT license), probable meanings not verified by the manufacturers. The same meaning can vary depending on the model: always have a diagnosis confirmed by a professional.