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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2014LEGACY 2.5I, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 50 (ENGINE CONTROL SYSTEM (DIAGNOSTICS) (H4DOTC))
2014 Subaru Legacy 2.5i, Automatic CVT Trans
Section 50 (Engine Control System (Diagnostics) (H4DOTC))
2014 Subaru Legacy 2.5i, Automatic CVT TransSECTION Section 50 (Engine Control System (Diagnostics) (H4DOTC))
WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
- Basic Diagnostic Procedure
- Check List for Interview
- General Description
- Electrical Component Location
- Engine Control Module (ECM) I/O Signal
- Engine Condition Data
- Data Link Connector
- General Scan Tool
- Operation
- How To Use General Scan Tool
- Mode $01 (Current Powertrain Diagnostic Data)
- Mode $02 (Powertrain Freeze Frame Data)
- Mode $03 (Emission-Related Powertrain DTC)
- Mode $04 (Clear/Reset Emission-Related Diagnostic Information)
- Mode $06
- Mode $07
- Mode $08 (Request Control For On-Board System, Test, And Component)
- Mode $09
- Operation
- Subaru Select Monitor
- Read Diagnostic Trouble Code (DTC)
- Inspection Mode
- Drive Cycle
- Clear Memory Mode
- System Operation Check Mode
- Malfunction Indicator Light
- Diagnostics for Engine Starting Failure
- List of Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC P000A: A Camshaft Position Slow Response (Bank 1)
- DTC P000B: B Camshaft Position Slow Response (Bank 1)
- DTC P000C: A Camshaft Position Slow Response (Bank 2)
- DTC P000D: B Camshaft Position Slow Response (Bank 2)
- DTC P0010: "A" Camshaft Position Actuator Circuit/Open (Bank 1)
- DTC P0011: Intake Camshaft Position - Timing Over-Advanced Or System Performance (Bank 1)
- DTC P0013: B Camshaft Position Actuator Circuit/Open (Bank 1)
- DTC P0014: Exhaust AVCS System 1 (Range/Performance)
- DTC P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1)
- DTC P0017: Crank And Cam Timing B System Failure (Bank 1)
- DTC P0018: Crankshaft Position - Camshaft Position Correlation (Bank 2)
- DTC P0019: Crank And Cam Timing B System Failure (Bank 2)
- DTC P0020: "A" Camshaft Position Actuator Circuit/Open (Bank 2)
- DTC P0021: Intake Camshaft Position - Timing Over-Advanced Or System Performance (Bank 2)
- DTC P0023: B Camshaft Position Actuator Circuit/Open (Bank 2)
- DTC P0024: Exhaust AVCS System 2 (Range/Performance)
- DTC P0030: Ho2S Heater Control Circuit (Bank 1 Sensor 1)
- DTC P0031: Ho2S Heater Control Circuit Low (Bank 1 Sensor 1)
- DTC P0032: Ho2S Heater Control Circuit High (Bank 1 Sensor 1)
- DTC P0037: Ho2S Heater Control Circuit Low (Bank 1 Sensor 2)
- DTC P0038: Ho2S Heater Control Circuit High (Bank 1 Sensor 2)
- DTC P0068: Map/MAF - Throttle Position Correlation
- DTC P0087: Fuel Rail/System Pressure - Too Low
- DTC P0088: Fuel Rail/System Pressure - Too High
- DTC P0096: Intake Air Temperature Sensor #2 Range/Performance Problem
- DTC P0097: Intake Air Temperature Sensor #2 Circuit (Low)
- DTC P0098: Intake Air Temperature Sensor #2 Circuit (High)
- DTC P0101: Mass Or Volume Air Flow Circuit Range/Performance
- DTC P0102: Mass Or Volume Air Flow Circuit Low Input
- DTC P0103: Mass Or Volume Air Flow Circuit High Input
- DTC P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
- DTC P0108: Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- DTC P0111: Intake Air Temperature Sensor Range/Performance Problem
- DTC P0112: Intake Air Temperature Sensor 1 Circuit Low
- DTC P0113: Intake Air Temperature Sensor 1 Circuit High
- DTC P0116: Engine Coolant Temperature Sensor 1 Circuit Range/Performance
- DTC P0117: Engine Coolant Temperature Circuit Low
- DTC P0118: Engine Coolant Temperature Circuit High
- DTC P0122: Throttle/Pedal Position Sensor/Switch "A" Circuit Low
- DTC P0123: Throttle/Pedal Position Sensor/Switch "A" Circuit High
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature)
- DTC P0130: O2 Sensor Circuit (Bank 1 Sensor 1)
- DTC P0131: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
- DTC P0132: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
- DTC P0134: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
- DTC P0137: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
- DTC P0138: O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- DTC P013A: O2 Sensor Slow Response - Rich To Lean (Bank 1 Sensor 2)
- DTC P013B: O2 Sensor Slow Response - Lean To Rich (Bank 1 Sensor 2)
- DTC P013E: O2 Sensor Delayed Response - Rich To Lean (Bank 1 Sensor 2)
- DTC P013F: O2 Sensor Delayed Response - Lean To Rich (Bank 1 Sensor 2)
- DTC P0140: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
- DTC P0141: O2 Sensor Heater Circuit (Bank 1 Sensor 2)
- DTC P014C: O2 Sensor Slow Response - Rich To Lean (Bank 1 Sensor 1)
- DTC P014D: O2 Sensor Slow Response - Lean To Rich (Bank 1 Sensor 1)
- DTC P015A: O2 Sensor Delayed Response - Rich To Lean (Bank 1 Sensor 1)
- DTC P015B: O2 Sensor Delayed Response - Lean To Rich (Bank 1 Sensor 1)
- DTC P0171: System Too Lean (Bank 1)
- DTC P0172: System Too Rich (Bank 1)
- DTC P0191: Fuel Rail Pressure Sensor "A" Circuit Range/Performance
- DTC P0192: Fuel Rail Pressure Sensor Circuit Low
- DTC P0193: Fuel Rail Pressure Sensor Circuit High
- DTC P0196: Engine Oil Temperature Sensor Circuit Range/Performance
- DTC P0197: Engine Oil Temperature Sensor Low
- DTC P0198: Engine Oil Temperature Sensor High
- DTC P0222: Throttle/Pedal Position Sensor/Switch "B" Circuit Low
- DTC P0223: Throttle/Pedal Position Sensor/Switch "B" Circuit High
- DTC P0230: Fuel Pump Primary Circuit
- DTC P023F: Fuel Pump Secondary Circuit/Open
- DTC P0244: Turbo/Super Charger WASTEGATE Solenoid "A" Range/Performance
- DTC P0245: Turbo/Super Charger WASTEGATE Solenoid "A" Low
- DTC P0246: Turbo/Super Charger WASTEGATE Solenoid "A" High
- DTC P0300: Random/Multiple Cylinder Misfire Detected
- DTC P0301: Cylinder 1 Misfire Detected
- DTC P0302: Cylinder 2 Misfire Detected
- DTC P0303: Cylinder 3 Misfire Detected
- DTC P0304: Cylinder 4 Misfire Detected
- DTC P0327: Knock Sensor 1 Circuit Low (Bank 1 Or Single Sensor)
- DTC P0328: Knock Sensor 1 Circuit High (Bank 1 Or Single Sensor)
- DTC P0332: Knock Sensor 2 Circuit Low (Bank 2)
- DTC P0333: Knock Sensor 2 Circuit High (Bank 2)
- DTC P0335: Crankshaft Position Sensor "A" Circuit
- DTC P0336: Crankshaft Position Sensor "A" Circuit Range/Performance
- DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor)
- DTC P0341: Camshaft Position Sensor "A" Circuit Range/Performance (Bank 1 Or Single Sensor)
- DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2)
- DTC P0346: Camshaft Position Sensor "A" Circuit Range/Performance (Bank 2)
- DTC P0351: Ignition Coil A Primary/Secondary Circuit
- DTC P0352: Ignition Coil B Primary/Secondary Circuit
- DTC P0353: Ignition Coil C Primary/Secondary Circuit
- DTC P0354: Ignition Coil D Primary/Secondary Circuit
- DTC P0365: Camshaft Position Sensor "B" Circuit (Bank 1)
- DTC P0366: Camshaft Position Sensor B Circuit Range/Performance (Bank 1)
- DTC P0390: Camshaft Position Sensor "B" Circuit (Bank 2)
- DTC P0391: Camshaft Position Sensor B Circuit Range/Performance (Bank 2)
- DTC P0400: Exhaust Gas RECIRCULATION Flow
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0441: Evaporative Emission Cont. SYS. Incorrect Purge Flow
- DTC P0451: Evaporative Emission System Pressure Sensor/Switch Range/Performance
- DTC P0452: Evaporative Emission System Pressure Sensor/Switch Low
- DTC P0453: Evaporative Emission System Pressure Sensor/Switch High
- DTC P0455: Evaporative Emission System Leak Detected (Large Leak)
- DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
- DTC P0458: Evaporative Emission System Purge Control Valve Circuit Low
- DTC P0459: Evaporative Emission System Purge Control Valve Circuit High
- DTC P0461: Fuel Level Sensor "A" Circuit Range/Performance
- DTC P0462: Fuel Level Sensor "A" Circuit Low
- DTC P0463: Fuel Level Sensor "A" Circuit High
- DTC P0500: Vehicle Speed Sensor "A"
- DTC P0506: Idle Air Control System Rpm Lower Than Expected
- DTC P0507: Idle Air Control System Rpm Higher Than Expected
- DTC P050A: Cold Start Idle Air Control System Performance
- DTC P050B: Cold Start Ignition Timing Performance
- DTC P0512: Starter Request Circuit
- DTC P0516: Battery Temperature Sensor Circuit Low
- DTC P0517: Battery Temperature Sensor Circuit High
- DTC P0560: System Voltage
- DTC P0604: Internal Control Module Random Access Memory (Ram) Error
- DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- DTC P0606: Control Module Processor
- DTC P060A: Internal Control Module Monitoring Processor Performance
- DTC P060B: Internal Control Module A/D Processing Performance
- DTC P0616: Starter Relay Circuit Low
- DTC P0617: Starter Relay Circuit High
- DTC P062D: Fuel Injector Driver Circuit Performance (Bank 1)
- DTC P0700: Transmission Control System (Mil Request)
- DTC P081A: Starter Disable Circuit Low
- DTC P0851: Park/Neutral Switch Input Circuit Low (At Model)
- DTC P0852: Park/Neutral Switch Input Circuit High (At Model)
- DTC P1134: A/F Sensor Micro-Computer Problem
- DTC P113A: O2 Sensor Circuit (Open) (Bank 1 Sensor 2)
- DTC P1160: Return Spring Failure
- DTC P1261: Di Injector Circuit/Open - (Cylinder 1)
- DTC P1262: Di Injector Circuit/Open - (Cylinder 2)
- DTC P1263: Di Injector Circuit/Open - (Cylinder 3)
- DTC P1264: Di Injector Circuit/Open - (Cylinder 4)
- DTC P1449: Evaporative Emission Cont. SYS. Air Filter Clog
- DTC P1451 Evaporative Emission Cont. SYS.
- DTC P1458 CPC2 Solenoid Valve (Circuit Low)
- DTC P1459: CPC2 Solenoid Valve (Circuit High)
- DTC P1492: EGR Solenoid Valve Signal #1 Circuit Malfunction (Low Input)
- DTC P1493: EGR Solenoid Valve Signal #1 Circuit Malfunction (High Input)
- DTC P1494: EGR Solenoid Valve Signal #2 Circuit Malfunction (Low Input)
- DTC P1495: EGR Solenoid Valve Signal #2 Circuit Malfunction (High Input)
- DTC P1496: EGR Solenoid Valve Signal #3 Circuit Malfunction (Low Input)
- DTC P1497: EGR Solenoid Valve Signal #3 Circuit Malfunction (High Input)
- DTC P1498: EGR Solenoid Valve Signal #4 Circuit Malfunction (Low Input)
- DTC P1499: EGR Solenoid Valve Signal #4 Circuit Malfunction (High Input)
- DTC P1530: Battery Current Sensor Circuit Low
- DTC P1531: Battery Current Sensor Circuit High
- DTC P1532: Battery Charging System
- DTC P2004: Intake Manifold Runner Control Stuck Open (Bank 1)
- DTC P2005: Intake Manifold Runner Control Stuck Open (Bank 2)
- DTC P2006: Intake Manifold Runner Control Stuck Closed (Bank 1)
- DTC P2007: Intake Manifold Runner Control Stuck Closed (Bank 2)
- DTC P2009: Intake Manifold Runner Control Circuit Low (Bank 1)
- DTC P2012: Intake Manifold Runner Control Circuit Low (Bank 2)
- DTC P2016: Tumble Generated Valve Position Sensor 1 Circuit Low
- DTC P2017: Tumble Generated Valve Position Sensor 1 Circuit High
- DTC P2021: Tumble Generated Valve Position Sensor 2 Circuit Low
- DTC P2022: Tumble Generated Valve Position Sensor 2 Circuit High
- DTC P2096: Post Catalyst Fuel Trim System Too Lean (Bank 1)
- DTC P2097: Post Catalyst Fuel Trim System Too Rich (Bank 1)
- DTC P2101: Throttle Actuator Control Motor Circuit Range/Performance
- DTC P2102: Throttle Actuator Control Motor Circuit Low
- DTC P2103: Throttle Actuator Control Motor Circuit High
- DTC P2109: Throttle/Pedal Position Sensor "A" Minimum Stop Performance
- DTC P2119: Throttle Actuator Control Throttle Body Range/Performance
- DTC P2122: Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input
- DTC P2123: Throttle/Pedal Position Sensor/Switch "D" Circuit High Input
- DTC P2127: Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input
- DTC P2128: Throttle/Pedal Position Sensor/Switch "E" Circuit High Input
- DTC P2135: Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation
- DTC P2138: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation
- DTC P2146: Fuel Injector Power Supply A Open Circuit
- DTC P2195: O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 1)
- DTC P2196: O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 1)
- DTC P219A: Bank 1 Air-Fuel Ratio Imbalance
- DTC P2227: Barometric Pressure Circuit Range/Performance
- DTC P2228: Barometric Pressure Circuit Low
- DTC P2229: Barometric Pressure Circuit High
- DTC P2401: Evaporative Emission System Leak Detection Pump Control Circuit Low
- DTC P2402: Evaporative Emission System Leak Detection Pump Control Circuit High
- DTC P2404: Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
- DTC P2419: Evaporative Emission System Switching Valve Control Circuit Low
- DTC P2420: Evaporative Emission System Switching Valve Control Circuit High
- DTC P2610: ECM/Pcm Internal Engine Off Timer Performance
- DTC U0073: Control Module Communication Bus "A" Off
- DTC U0101: Lost Communication With TCM
- DTC U0122: Lost Communication With Vehicle Dynamics Control Module
- DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
- DTC U0402: Invalid Data Received From TCM
- DTC U0416: Invalid Data Received From Vehicle Dynamics Control Module
- DTC U0423: Invalid Data Received From Instrument Panel Cluster Control Module
- Diagnostic Procedure without Diagnostic Trouble Code (DTC)
- Check Si-Drive (SUBARU Intelligent Drive) System
- Diagnosis
- Even When The Si-Drive Mode Is Changed, The Si-Drive Mode Display In Combination Meter Does Not Change, And The Mode Does Not Switch
- When The Si-Drive Mode Is Changed, "S", "I" Or "S#" Flashes In Combination Meter Si-Drive Mode Display In Approx. 5 Seconds
- When The Si-Drive Mode Is Changed, "S", "I" Or "S#" Flashes In Combination Meter Si-Drive Mode Display
- Check Si-Drive (SUBARU Intelligent Drive) System
- General Diagnostic Table
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.