Diagnostic Trouble Code Definitions

SUBARU DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION CHART

Code No. ⁽¹⁾

Circuit Affected

P0030 ⁽²⁾

Front Heated Oxygen Sensor (HO2S) Control Circuit Malfunction

P0030 ⁽³⁾

Front Heated Oxygen Sensor (HO2S) Control Circuit Malfunction

P0031

Front Heated Oxygen Sensor (HO2S) Heater Circuit Low Input

P0032

Front HO2S Heater Circuit High Input

P0037

Rear HO2S Heater Circuit Malfunction

P0038

Rear HO2S Heater Circuit High Output

P0065

Air Assist Injector Solenoid Valve Circuit Malfunction

P0066

Air Assist Injector Solenoid Valve Circuit Low Input

P0067

Air Assist Injector Solenoid Valve Circuit High Input

P0068

Intake Manifold Barometric Pressure Circuit Range/Performance Problem

P0107 ⁽²⁾

Intake Air Temperature & Pressure Sensor Circuit Low Input

P0107 ⁽³⁾

Intake Manifold Pressure Sensor Circuit Low Input

P0108 ⁽²⁾

Intake Air Temperature & Pressure Sensor Circuit High Input

P0108 ⁽³⁾

Intake Manifold Pressure Sensor Circuit High Input

P0111

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

P0112

Intake Air Temperature (IAT) Sensor Circuit Low Input

P0113

Intake Air Temperature (IAT) Sensor Circuit High Input

P0117

Engine Coolant Temperature (ECT) Sensor Circuit Low Input

P0118

Engine Coolant Temperature (ECT) Sensor Circuit High Input

P0121 ⁽²⁾

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

P0121 ⁽³⁾

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

Thermostat Malfunction

P0129

Barometric Pressure Too Low

P0130

Front HO2S Circuit Range/Performance Problem

P0131

Front HO2S Circuit Range/Performance Problem (Low Input)

P0132

Front HO2S Circuit Range/Performance Problem (High Input)

P0133

Front HO2S Circuit Slow Response

P0134

Front HO2S Circuit No Activity Detected

P0137

Rear HO2S Circuit Low Input

P0138

Rear HO2S Circuit High Input

P0139

Rear HO2S Circuit Slow Response

P0171 ⁽²⁾

Fuel Trim Malfunction (Too Lean)

P0171 ⁽³⁾

Fuel Trim Malfunction (Too Lean)

P0172 ⁽²⁾

Fuel Trim Malfunction (Too Rich)

P0172 ⁽³⁾

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

P0327

Knock Sensor (KS) Circuit Low Input

P0328

Knock Sensor (KS) Circuit High Input

P0335

Crankshaft Position 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

P0400 ⁽²⁾

Exhaust Gas Recirculation Flow Problem

P0420

Catalyst System Efficiency Below Threshold

P0442

EVAP System Purge Control Valve Circuit Malfunction

P0447

EVAP System Vent Control Circuit Low Input

P0448

EVAP System Vent Control Circuit High Input

P0451

EVAP System Pressure Sensor Range/Performance Problem

P0452

EVAP System Pressure Sensor Low Input

P0453 ⁽²⁾

EVAP System Pressure Sensor High Input

P0453 ⁽³⁾

EVAP System Pressure Sensor High Input

P0456

EVAP System Malfunction

P0457

EVAP System Leak Detected (Fuel Cap Loose/Off)

P0458

EVAP System Purge Control Valve Circuit Low Input

P0459

EVAP System Purge Control Valve Circuit High Input

P0461

Fuel Level Sensor Circuit Range/Performance Problem

P0462 ⁽²⁾

Fuel Level Sensor Circuit Low Input

P0462 ⁽³⁾

Fuel Level Sensor Circuit Low Input

P0463 ⁽²⁾

Fuel Level Sensor Circuit High Input

P0463 ⁽³⁾

Fuel Level Sensor Circuit High Input

P0464

Fuel Level Sensor Circuit Intermittent Input

P0483

Cooling Fan Function Problem

P0502

Vehicle Speed Sensor Circuit Low Input

P0503 ⁽²⁾

Vehicle Speed Sensor Intermittent/Erratic/High

P0503 ⁽³⁾

Vehicle Speed Sensor Intermittent/Erratic/High

P0506

Idle Control System RPM Lower Than Expected

P0507

Idle Control System RPM Higher Than Expected

P0512

Starter Switch Circuit High Input

P0519

Idle Air Control Circuit System Performance

P0565 ⁽²⁾

Cruise Control ON Signal

P0565 ⁽³⁾

Cruise Control ON Signal

P0604

Internal Control Module Memory Check Sum Error

P0691 ⁽²⁾

Cooling Fan 1 Control Circuit Low Input

P0691 ⁽³⁾

Cooling Fan 1 Control Circuit Low Input

P0692 ⁽²⁾

Cooling Fan 1 Control Circuit High Input

P0692 ⁽³⁾

Cooling Fan 1 Control Circuit High Input

P0703 ⁽⁴⁾

Brake Switch Input Malfunction (A/T)

P0705⁽⁴⁾

Transmission Range Sensor Circuit Malfunction (A/T)

P0710 ⁽⁴⁾

Transmission Fluid Temperature Sensor Circuit Malfunction (A/T)

P0716 ⁽⁴⁾

Input/Turbine Speed Sensor Circuit Range/Performance Problem

P0720⁽⁴⁾

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

P0726⁽⁴⁾

Engine Speed Input Circuit Range/Performance

P0731 ⁽⁴⁾

Gear 1 Incorrect Ratio (A/T)

P0732 ⁽⁴⁾

Gear 2 Incorrect Ratio (A/T)

P0733 ⁽⁴⁾

Gear 3 Incorrect Ratio (A/T)

P0734 ⁽⁴⁾

Gear 4 Incorrect Ratio (A/T)

P0741 ⁽⁴⁾

Torque Converter Clutch Circuit Performance Or Stuck Off (A/T)

P0743 ⁽⁴⁾

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

P0748 ⁽⁴⁾

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

P0753 ⁽⁴⁾

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

P0758 ⁽⁴⁾

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

P0771

Shift Solenoid "E" Performance Or Stuck Off

P0778 ⁽⁴⁾

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

P0785 ⁽⁴⁾

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

P0851 ⁽⁵⁾

Neutral Switch Input Circuit Low

P0851 ⁽⁶⁾

Neutral Switch Input Circuit Low

P0852 ⁽⁵⁾

Neutral Switch Input Circuit High

P0852 ⁽⁶⁾

Neutral Switch Input Circuit High

P0864

TCM Communication Circuit Range/Performance

P0865 ⁽²⁾

TCM Communication Circuit Low Input

P0865 ⁽³⁾

TCM Communication Circuit Low Input

P0866 ⁽²⁾

TCM Communication Circuit High Input

P0866 ⁽³⁾

TCM Communication Circuit High Input

P1110

Atmospheric Pressure Sensor Circuit Low Input

P1111

Atmospheric Pressure Sensor Circuit High Input

P1134

Front HO2S Micro-Computer Problem

P1137

Front HO2S Circuit Range/Performance Problem

P1400

Fuel Tank Pressure Control Solenoid Valve Circuit Low Input

P1420

Fuel Tank Pressure Control Solenoid Valve Circuit High Input

P1443

Vent Control Solenoid Valve Function Problem

P1446

Fuel Tank Sensor Control Valve Circuit Low Input

P1447

Fuel Tank Sensor Control Valve Circuit High

P1448

Fuel Tank Sensor Control Valve Range/Performance Problem

P1492 ⁽²⁾

EGR Solenoid Valve Signal 1 Circuit Low Input

P1493 ⁽²⁾

EGR Solenoid Valve Signal 1 Circuit High Input

P1494 ⁽²⁾

EGR Solenoid Valve Signal 2 Circuit Low Input

P1495 ⁽²⁾

EGR Solenoid Valve Signal 2 Circuit Malfunction High Input

P1496 ⁽²⁾

EGR Solenoid Valve Signal 3 Circuit Low Input

P1497 ⁽²⁾

EGR Solenoid Valve Signal 3 Circuit High Input

P1498 ⁽²⁾

EGR Solenoid Valve Signal 4 Circuit Low Input

P1499 ⁽²⁾

EGR Solenoid Valve Signal 4 Circuit High Input

P1510

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

P1511

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

P1512

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

P1513

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

P1514

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

P1515

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

P1516

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

P1517

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

P1518

Starter Switch Circuit Low Input

P1560

Back-Up Voltage Circuit Malfunction

P1698 ⁽⁴⁾

Engine Torque Control Cut Signal Circuit Low Input

P1699 ⁽⁴⁾

Engine Torque Control Cut Signal Circuit High Input

P1700 ⁽⁴⁾

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

P1711 ⁽⁴⁾

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

P1712 ⁽⁴⁾

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

⁽¹⁾	All codes apply to all 2.5L models unless otherwise specified.

⁽²⁾	Baja, Legacy and Outback

⁽³⁾	Forester, Impreza and Outback Sport.

⁽⁴⁾	Covered in entirety in appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

⁽⁵⁾	A/T models only.

⁽⁶⁾	M/T models only.