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 MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 24 (HVAC SYSTEM (DIAGNOSTICS) (HEV))
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans
Section 24 (HVAC System (Diagnostics) (HEV))
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Section 24 (HVAC System (Diagnostics) (HEV))
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. 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
- Control Module I/O Signal
- Inspection Mode
- Diagnostic Procedure For Subaru Select Monitor Communication
- Data Monitor
- Freeze Frame Data
- Active Test
- Customize
- Work Support
- Diagnostic Trouble Code (DTC)
- Diagnostic Procedure With Diagnostic Trouble Code (DTC)
- DTC B1430: In-Vehicle (Post Evaporator) Temperature Sensor Circuit Open
- DTC B1431: In-Vehicle (Post Evaporator) Temperature Sensor Circuit Short-Circuit
- DTC B1432: Ambient Temperature Sensor Circuit Open (Air-Conditioner)
- DTC B1433: Ambient Temperature Sensor Circuit Short-Circuit (Air-Conditioner)
- DTC B1434: Evaporator Temperature Sensor Circuit Open
- DTC B1435: Evaporator Temperature Sensor Circuit Short-Circuit
- DTC B1438: Mode Door Actuator Circuit Open
- DTC B1439: Mode Door Actuator Circuit Short-Circuit
- DTC B1440: Air Mix Door Actuator Circuit Open (Driver)
- DTC B1442: Air Mix Door Actuator Circuit Short-Circuit (Driver)
- DTC B1443: Mode Door Actuator Circuit Stuck
- DTC B1446: Air Mix Door Actuator Circuit Stuck (Driver)
- DTC B1450: Low-Pressure Solenoid Valve Circuit/Open
- DTC B1451: High-Pressure Solenoid Valve Circuit/Open
- DTC B1452: Heating Expansion Valve Circuit/Open
- DTC B1453: Cooling Expansion Valve Circuit/Open
- DTC B1454: Indoor Condenser Exit Temperature Sensor Circuit Open
- DTC B1455: Indoor Condenser Exit Temperature Sensor Circuit Short
- DTC B1456: Outdoor Condenser Exit Temperature Sensor Circuit Open
- DTC B1457: Outdoor Condenser Exit Temperature Sensor Circuit Short
- DTC B1458: Discharge Temperature Sensor Circuit Open
- DTC B1459: Discharge Temperature Sensor Circuit Short
- DTC B145A: Evaporator Exit Temperature Sensor Circuit Open
- DTC B145B: Evaporator Exit Temperature Sensor Circuit Short
- DTC B145C: Heat Pump Ecu Communication
- DTC B145D: Refrigerant Pressure
- DTC B1470: A/C Inverter High Voltage
- DTC B1471: A/C Inverter High Voltage Output
- DTC B1473: A/C Inverter Hardware
- DTC B1474: A/C Inverter Temperature
- DTC B1475: A/C Inverter Load
- DTC B1476: A/C Inverter Low Voltage
- DTC B1477: A/C Inverter Local Communication
- DTC B14A1: SUNLOAD Sensor Circuit Low/Open
- DTC B14A2: SUNLOAD Sensor Circuit Short-Circuit
- DTC B14A3: Refrigerant Pressure Sensor Circuit Open
- DTC B14A4: Refrigerant Pressure Sensor Circuit Short-Circuit
- DTC B14E7: Heater Core Sensor Circuit Open
- DTC B14E8: Heater Core Sensor Circuit Short-Circuit
- DTC B14E9: Intake Door Actuator Circuit Open
- DTC B14EA: Intake Door Actuator Circuit Short-Circuit
- DTC B14EB: Intake Door Actuator Stuck
- DTC U0028: Heater Control Panel Communication Error
- DTC U0073: Control Module Communication Bus Off
- DTC U0100: Lost Communication With ECM/Pcm "A"
- DTC U0122: Lost Communication With Vehicle Dynamics Control Module
- DTC U0140: Lost Communication With Body Control Module
- DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
- DTC U0293: Lost Communication With Hybrid Powertrain Control Module
- DTC U0401: Invalid Data Received From ECM/Pcm "A"
- DTC U0416: Invalid Data Received From Vehicle Dynamics Control Module
- DTC U0422: Invalid Data Received From Body Control Module
- DTC U0423: Invalid Data Received From Instrument Panel Cluster Control Module
- DTC P1C7C-49: Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure
- Diagnostics With Phenomenon
- List
- Inspection
- Air Inlet Selection Indicator Blinks
- Nothing Is Displayed On The Screen Or Indicators Do Not Illuminate
- Air Conditioner Does Not Stop Even When The On/Off Switch Turned To Off
- The Windshield Glass Is Not Cleared Even When The Def Switch Is Turned To On
- Cold Air Not Emitted
- Warm Air Not Emitted
- Compartment Temperature Is Excessively Lower Than Setting Temperature
- Compartment Temperature Is Excessively Higher Than Setting Temperature
- Air Does Not Come Out, Or Airflow Capacity Is Insufficient. (Blower Motor Does Not Rotate)
- Air Goes Out Of Control. (Blower Motor Rotates At High Speed)
- Cold Air Does Not Come Out Even When The A/C Switch Is Pressed; The Glass Cannot Be Defogged. (Compressor Does Not Operate (Electric))
- Unable To Switch Suction Vents
- Unable To Switch Vents
- Illumination Does Not Come On, Or Cannot Dim
- Check PTC Heater
- Remote Climate Control (RCC) Does Not Operate Normally
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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.