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.
2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Engine Control System (Diagnostics) (4 Of 4)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- 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 P2146: Fuel Injector Group "A" Supply Voltage Circuit/Open
- 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 P219A: Bank 1 Air-Fuel Ratio Imbalance
- DTC P2227: Barometric Pressure Sensor "A" Circuit Range/Performance
- DTC P2228: Barometric Pressure Sensor "A" Circuit Low
- DTC P2229: Barometric Pressure Sensor "A" Circuit High
- DTC P226B: Turbocharger/Supercharger Boost Pressure Too High - Mechanical
- 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 P24B9: EVAP System Leak Detection Pump Pressure Sensor Circuit Range/Performance
- DTC P24BA: EVAP System Leak Detection Pump Pressure Sensor Circuit Low
- DTC P24BB: EVAP System Leak Detection Pump Pressure Sensor Circuit High
- DTC P24D6: EVAP System Pressure Sensor/Switch "B" Circuit Range/Performance
- DTC P24D7: EVAP System Pressure Sensor/Switch "B" Circuit Low
- DTC P24D8: EVAP System Pressure Sensor/Switch "B" Circuit High
- DTC P2530: Ignition Switch Run Position Circuit
- DTC P2564: Turbocharger Boost Control Position Sensor "A" Circuit Low
- DTC P2565: Turbocharger Boost Control Position Sensor "A" Circuit High
- 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 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
- DTC U171F: Lost Lin Communication With Generator
Factory Service Tools
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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.
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