Diagnostic Trouble Code Definitions

SUBARU DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION CHART

Code No. ⁽¹⁾

Circuit Affected

P0031 ⁽²⁾

Front Heated Oxygen Sensor (HO2S) Heater Circuit Low Input

P0032 ⁽²⁾

Front HO2S Heater Circuit High Input

P0037 ⁽²⁾

Rear HO2S Heater Circuit Malfunction

P0038 ⁽²⁾

Rear HO2S Heater Circuit High Output

P0065 ⁽²⁾

Air Assist Injector Solenoid Valve Circuit Malfunction

P0066 ⁽²⁾

Air Assist Injector Solenoid Valve Circuit Low Input

P0067 ⁽²⁾

Air Assist Injector Solenoid Valve Circuit High Input

P0106 ⁽³⁾

Intake Air Temperature & Pressure Sensor Circuit Range/Performance Problem

P0106 ⁽⁴⁾

Intake Manifold Pressure Sensor Circuit Range/Performance Problem

P0107 ⁽³⁾

Intake Air Temperature & Pressure Sensor Circuit Low Input

P0107 ⁽⁴⁾

Intake Manifold Pressure Sensor Circuit Low Input

P0108 ⁽³⁾

Intake Air Temperature & Pressure Sensor Circuit High Input

P0108 ⁽⁴⁾

Intake Manifold Pressure Sensor Circuit High Input

P0111 ⁽³⁾

Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem

P0111 ⁽⁴⁾

Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem

P0112 ⁽³⁾

Intake Air Temperature (IAT) Sensor Circuit Low Input

P0112 ⁽⁴⁾

Intake Air Temperature (IAT) Sensor Circuit Low Input

P0113 ⁽³⁾

Intake Air Temperature (IAT) Sensor Circuit High Input

P0113 ⁽⁴⁾

Intake Air Temperature (IAT) Sensor Circuit High Input

P0116 ⁽⁵⁾

Engine Coolant Temperature (ECT) Sensor Circuit Low Input

P0117 ⁽⁵⁾

Engine Coolant Temperature (ECT) Sensor Circuit High Input

P0117 ⁽²⁾

Engine Coolant Temperature (ECT) Sensor Circuit Low Input

P0118 ⁽²⁾

Engine Coolant Temperature (ECT) Sensor Circuit High Input

P0121 ⁽³⁾

Throttle Position (TP) Sensor Circuit Range/Performance Problem (High Input)

P0121 ⁽⁴⁾

Throttle Position (TP) Sensor Circuit Range/Performance Problem (High Input)

P0122

Throttle Position (TP) Sensor Circuit Low Input

P0123

Throttle Position (TP) Sensor Circuit High Input

P0125

Engine Coolant Temperature Too Low For Closed Loop Fuel Control

P0128 ⁽²⁾

Thermostat Malfunction

P0130 ⁽³⁾

Front HO2S Circuit Range/Performance Problem

P0131 ⁽⁴⁾

Front HO2S Circuit Range/Performance Problem (Low Input)

P0131 ⁽²⁾

Front HO2S Circuit Range/Performance Problem (Low Input)

P0132 ⁽⁴⁾

Front HO2S Circuit Range/Performance Problem (High Input)

P0132 ⁽²⁾

Front HO2S Circuit Range/Performance Problem (High Input)

P0133

Front HO2S Circuit Slow Response

P0136

Rear HO2S Circuit Malfunction

P0139

Rear HO2S Circuit Slow Response

P0141 ⁽⁶⁾

Rear HO2S Heater Circuit Malfunction/Low Input

P0141 ⁽⁴⁾

Rear HO2S Heater Circuit Malfunction/Low Input

P0170 ⁽³⁾

Fuel Trim Malfunction

P0171 ⁽⁴⁾

Fuel Trim Malfunction (Too Lean)

P0172 ⁽⁴⁾

Fuel Trim Malfunction (Too Rich)

P0181

Fuel Temperature Sensor "A" Circuit Range/Performance Problem

P0182

Fuel Temperature Sensor "A" Circuit Low Input

P0183

Fuel Temperature Sensor "A" Circuit High Input

P0301

Cylinder No. 1 Misfire Detected

P0302

Cylinder No. 2 Misfire Detected

P0303

Cylinder No. 3 Misfire Detected

P0304

Cylinder No. 4 Misfire Detected

P0325 ⁽⁵⁾

Knock Sensor (KS) Circuit High Input

P0327 ⁽²⁾

Knock Sensor (KS) Circuit Low Input

P0328 ⁽²⁾

Knock Sensor (KS) Circuit High Input

P0335

Crankshaft Position (CKP) Sensor Circuit Malfunction

P0336

Crankshaft Position (CKP) Sensor Circuit Range/Performance Problem

P0340

Camshaft Position (CMP) Sensor Circuit Malfunction

P0341

Camshaft Position (CMP) Sensor Circuit Range/Performance Problem

P0420

Catalyst System Efficiency Below Threshold

P0440 ⁽⁵⁾

EVAP System Malfunction

P0442 ⁽³⁾

EVAP System Purge Control Valve Circuit Malfunction

P0443 ⁽⁵⁾

EVAP System Purge Control Valve Circuit Low Input

P0444 ⁽²⁾

EVAP System Purge Control Valve Circuit Low Input

P0445 ⁽²⁾

EVAP System Purge Control Valve Circuit High Input

P0446 ⁽⁵⁾

EVAP System Vent Control Circuit Low Input

P0447 ⁽²⁾

EVAP System Vent Control Circuit Low Input

P0448 ⁽²⁾

EVAP System Vent Control Circuit High Input

P0451

EVAP System Pressure Sensor Range/Performance Problem

P0452 ⁽⁷⁾

EVAP System Pressure Sensor Low Input

P0452 ⁽⁸⁾

EVAP System Pressure Sensor Low Input

P0453 ⁽⁷⁾

EVAP System Pressure Sensor High Input

P0453 ⁽⁸⁾

EVAP System Pressure Sensor High Input

P0456 ⁽²⁾

EVAP System Malfunction

P0461

Fuel Level Sensor Circuit Range/Performance Problem

P0462

Fuel Level Sensor Circuit Low Input

P0463

Fuel Level Sensor Circuit High Input

P0464 ⁽²⁾

Fuel Level Sensor Circuit Intermittent Input

P0480

Cooling Fan Relay No. 1 Circuit Low Input

P0483

Cooling Fan Function Problem

P0500

Vehicle Speed Sensor (VSS) Malfunction

P0505 ⁽⁴⁾

Idle Control System Low Input

P0506 ⁽³⁾

Idle Control System RPM Lower Than Expected

P0506 ⁽⁴⁾

Idle Control System RPM Lower Than Expected

P0507

Idle Control System RPM Higher Than Expected

P0512 ⁽²⁾

Starter Switch Circuit High Input

P0601 ⁽⁵⁾

Internal Control Module Memory Check Sum Error

P0604 ⁽²⁾

Internal Control Module Memory Check Sum Error

DTC P0703

Brake Switch Input Malfunction (A/T)

P0705 (Inhibitor Switch)

Transmission Range Sensor Circuit Malfunction (A/T)

P0710 (DTC 27)

Transmission Fluid Temperature Sensor Circuit Malfunction (A/T)

P0715 (DTC 36)

Torque Converter Turbine Speed Sensor Circuit Malfunction (A/T)

P0720 (DTC 33)

Output Speed Sensor (VSS No. 2) Circuit Malfunction (A/T)

P0725 (DTC 11)

Engine Speed Input Circuit Malfunction (A/T)

P0731

Gear 1 Incorrect Ratio (A/T)

P0732

Gear 2 Incorrect Ratio (A/T)

P0733

Gear 3 Incorrect Ratio (A/T)

P0734

Gear 4 Incorrect Ratio (A/T)

P0740 & P0741 ⁽⁵⁾

Torque Converter Clutch System Malfunction (A/T)

P0743 (DTC 77)

Torque Converter Clutch System (Lock-Up Duty Solenoid) Electrical (A/T)

P0748 (DTC 75)

Pressure Control Solenoid (Line Pressure Duty Solenoid) Electrical (A/T)

P0753 (DTC 71)

Shift Solenoid "A" (No. 1) Electrical (A/T)

P0758 (DTC 72)

Shift Solenoid "B" (No. 2) Electrical (A/T)

P0778 (DTC 76)⁽²⁾

2-4 Brake Pressure Control Solenoid Valve Circuit Malfunction (A/T)

P0785 (DTC 74)⁽²⁾

2-4 Brake Timing Control Solenoid Valve Circuit Malfunction (A/T)

P1100 ⁽⁵⁾

Starter Switch Circuit Low Input

P1101 ⁽⁷⁾

Neutral Position Switch Circuit Low Input (M/T)

P1101 ⁽⁵⁾

Neutral Position Switch Circuit High Input (A/T)

P1103 ⁽⁷⁾

Engine Torque Control Signal No. 1 Circuit Malfunction (A/T)

P1106 ⁽⁷⁾

Engine Torque Control Signal No. 2 Circuit Malfunction (A/T)

P1110 ⁽³⁾

Atmospheric Pressure Sensor Circuit Low Input

P1110 ⁽⁴⁾

Atmospheric Pressure Sensor Circuit Low Input

P1111 ⁽³⁾

Atmospheric Pressure Sensor Circuit High Input

P1111 ⁽⁴⁾

Atmospheric Pressure Sensor Circuit High Input

P1112 ⁽³⁾

Atmospheric Pressure Sensor Circuit Range/Performance Problem

P1112 ⁽⁴⁾

Atmospheric Pressure Sensor Circuit Range/Performance Problem

P1115 ⁽⁷⁾

Engine Torque Control Cut Signal Circuit High Input

P1116 ⁽⁷⁾

Engine Torque Control Cut Signal Circuit Low Input

P1120 ⁽⁵⁾

Starter Switch Circuit High Input

P1121 ⁽⁷⁾

Neutral Position Switch Circuit High Input (A/T)

P1121 ⁽⁵⁾

Neutral Position Switch Circuit Low Input (M/T)

P1130 ⁽⁶⁾

Front HO2S Circuit Malfunction (Open Circuit)

P1130 ⁽⁴⁾

Front HO2S Circuit Malfunction (Open Circuit)

P1131 ⁽⁶⁾

Front HO2S Circuit Malfunction (Short Circuit)

P1131 ⁽⁴⁾

Front HO2S Circuit Malfunction (Short Circuit)

P1132 ⁽⁶⁾

Front HO2S Heater Circuit Low Input

P1132 ⁽⁴⁾

Front HO2S Heater Circuit Low Input

P1133 ⁽⁵⁾

Front HO2S Heater Circuit High Input

P1134 ⁽⁴⁾

Front HO2S Micro-Computer Problem

P1137 ⁽²⁾

Front HO2S Circuit Range/Performance Problem

P1139 ⁽⁴⁾

Front HO2S No. 1 Heater Circuit Range/Performance Problem

P1142 ⁽³⁾

Throttle Position (TP) Sensor Circuit Range/Performance Problem (Low Input)

P1142 ⁽⁴⁾

Throttle Position (TP) Sensor Circuit Range/Performance Problem (Low Input)

P1146 ⁽²⁾

Pressure Sensor Circuit Range/Performance Problem (High Input)

P1151 ⁽⁶⁾

Rear HO2S Heater Circuit High Input

P1151 ⁽⁴⁾

Rear HO2S Heater Circuit High Input

P1207 ⁽⁶⁾

Air Assist Injector Solenoid Valve Circuit Low Input

P1208 ⁽⁶⁾

Air Assist Injector Solenoid Valve Circuit High Input

P1325 ⁽⁶⁾

Knock Sensor (KS) Circuit Low Input

P1400

Fuel Tank Pressure Control Solenoid Valve Circuit Low Input

P1420

Fuel Tank Pressure Control Solenoid Valve Circuit High Input

P1422 ⁽⁵⁾

EVAP System Purge Control Solenoid Valve Circuit High Input

P1423 ⁽⁵⁾

EVAP System Vent Control High Input

P1442 ⁽³⁾

Fuel Level Sensor Circuit Range/Performance Problem 2

P1443

EVAP System Vent Control Function Problem

P1445 ⁽⁶⁾

Air Assist Injector Solenoid Valve Malfunction

P1480 ⁽²⁾

Cooling Fan Relay No. 1 Circuit High Input

P1490 ⁽⁶⁾

Thermostat Malfunction

P1505 ⁽⁴⁾

Idle Control System Circuit High Input

P1507 ⁽³⁾

Idle Control System Malfunction (Fail-Safe)

P1507 ⁽⁴⁾

Idle Control System Malfunction (Fail-Safe)

P1510 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 1 Circuit Low Input

P1511 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 1 Circuit High Input

P1512 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 2 Circuit Low Input

P1513 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 2 Circuit High Input

P1514 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 3 Circuit Low Input

P1515 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 3 Circuit High Input

P1516 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 4 Circuit Low Input

P1517 ⁽³⁾

Idle Air Control (IAC) Solenoid Valve Signal No. 4 Circuit High Input

P1518 ⁽²⁾

Starter Switch Circuit Low Input

P1520 ⁽⁵⁾

Radiator Fan Relay No. 1 Circuit High Input

P1540 ⁽³⁾

Vehicle Speed Sensor (VSS) Malfunction 2

P1560

Back-Up Voltage Circuit Malfunction

P1590 ⁽²⁾

Neutral Position Switch Circuit High Input (A/T)

P1591 ⁽²⁾

Neutral Position Switch Circuit Low Input (A/T)

P1594 ⁽²⁾⁽⁹⁾

Automatic Transmission Diagnosis Input Signal Circuit Malfunction

P1595 ⁽²⁾⁽⁹⁾

Automatic Transmission Diagnosis Input Signal Circuit Low Input

P1596 ⁽²⁾⁽⁹⁾

Automatic Transmission Diagnosis Input Signal Circuit High Input

P1698 ⁽²⁾⁽⁹⁾

Engine Torque Control Cut Signal Circuit Low Input

P1699 ⁽²⁾⁽⁹⁾

Engine Torque Control Cut Signal Circuit High Input

P1700 (DTC 31)

Throttle Position (TP) Sensor Circuit Malfunction (A/T)

P1701 ⁽⁹⁾

Cruise Control Set Signal Circuit Malfunction (A/T)

P1702 ⁽⁷⁾⁽⁹⁾

Transmission Diagnosis Input Signal Circuit Low Input (A/T)

P1703 (DTC 73)

Low Clutch Timing Control Solenoid Valve Circuit Malfunction (A/T)

P1704 (DTC 74)⁽⁷⁾

2-4 Brake Timing Control Solenoid Valve Circuit Malfunction (A/T)

P1705 (DTC 76)⁽⁷⁾

2-4 Brake Pressure Control Solenoid Valve Circuit Malfunction (A/T)

P1711 (DTC 38)⁽²⁾

Engine Torque Control Signal No. 1 Circuit Malfunction (A/T)

P1712 (DTC 38)⁽²⁾

Engine Torque Control Signal No. 2 Circuit Malfunction (A/T)

P1722 DIAGNOSTIC CHART WITH SELECT MONITOR ⁽⁷⁾

Transmission Diagnosis Input Signal Circuit High Input (A/T)

P1742 DIAGNOSTIC CHART WITH SELECT MONITOR ⁽⁷⁾

Transmission Diagnosis Input Signal Circuit Malfunction (A/T)

⁽¹⁾	Some codes are two-trip detection logic code(s). For more information, see TWO-TRIP DETECTION LOGIC under SELF-DIAGNOSTIC SYSTEM.

⁽²⁾	Legacy and Outback 2.5L A/T.

⁽³⁾	Forester, Impreza 2.5L and Legacy and Outback 2.5L A/T.

⁽⁴⁾	Impreza 2.2L, Legacy and Outback 2.5L M/T and Outback Sport.

⁽⁵⁾	Except Legacy and Outback 2.5L A/T.

⁽⁶⁾	Forester and Impreza 2.5L.

⁽⁷⁾	Forester, Impreza and Outback Sport.

⁽⁸⁾	Legacy and Outback 2.5L.

⁽⁹⁾	Covered in entirety in appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.