Safety Warning
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 MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS (H4DO) (DIAGNOSTICS) (4 OF 4)
2016 Subaru Legacy 2.5i
Engine Controls (H4DO) (Diagnostics) (4 Of 4)
2016 Subaru Legacy 2.5iSECTION Engine Controls (H4DO) (Diagnostics) (4 Of 4)
- DTC P2004 TGV Control Stuck Open Bank 1
- DTC P2005 TGV Control Stuck Open Bank 2
- DTC P2006 TGV Control Stuck Closed Bank 1
- DTC P2007 TGV Control Stuck Closed Bank 2
- DTC P2008 TGV Control Circuit/Open Bank 1
- DTC P2009 TGV Control Circuit Low Bank 1
- DTC P2011 TGV Control Circuit/Open Bank 2
- DTC P2012 TGV Control Circuit Low Bank 2
- DTC P2016 TGV Position Sensor/Switch Circuit Low Bank 1
- DTC P2017 TGV Position Sensor/Switch Circuit High Bank 1
- DTC P2021 TGV Position Sensor/Switch Circuit Low Bank 2
- DTC P2022 TGV Position Sensor/Switch Circuit High Bank 2
- 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 "A" Control Motor Circuit Range/Performance
- DTC P2102 Throttle Actuator "A" Control Motor Circuit Low
- DTC P2103 Throttle Actuator "A" Control Motor Circuit High
- DTC P2109 Throttle/Pedal Position Sensor "A" Minimum Stop Performance
- DTC P2119 Throttle Actuator "A" Control Throttle Body Range/Performance
- DTC P2122 Throttle/Pedal Position Sensor/Switch "D" Circuit Low
- DTC P2123 Throttle/Pedal Position Sensor/Switch "D" Circuit High
- DTC P2127 Throttle/Pedal Position Sensor/Switch "E" Circuit Low
- DTC P2128 Throttle/Pedal Position Sensor/Switch "E" Circuit High
- DTC P2135 Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation
- DTC P2138 Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation
- DTC P2195 A/F/O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1
- DTC P2196 A/F/O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1
- DTC P219C Cylinder 1 Air-Fuel Ratio Imbalance
- DTC P219D Cylinder 2 Air-Fuel Ratio Imbalance
- DTC P219E Cylinder 3 Air-Fuel Ratio Imbalance
- DTC P219F Cylinder 4 Air-Fuel Ratio Imbalance
- DTC P2270 O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2
- DTC P2271 O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2
- DTC P2401 EVAP System Leak Detection Pump Control Circuit Low
- DTC P2402 EVAP System Leak Detection Pump Control Circuit High
- DTC P2404 EVAP System Leak Detection Pump Sense Circuit Range/Performance
- DTC P2419 EVAP System Switching Valve Control Circuit Low
- DTC P2420 EVAP System Switching Valve Control Circuit High
- DTC P2530 Ignition Switch Run Position Circuit
- DTC P2610 ECM/Pcm Engine Off Timer Performance
- DTC U0073 Control Module Communication Bus Off
- DTC U0077 Lin Communication Bus "ECM/Pcm" 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 U0284 Lost Communication With Active Grille Shutter Module "A"
- 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
- DTC U1712 Lost Lin Communication With Battery "1" Monitor Module
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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.