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.
2012 Subaru Outback Base, Automatic CVT TransFACTORY OEM SERVICE PROCEDURE
HVAC DTCS
HVAC DIAGNOSTIC TROUBLE CODES (DTC) LIST
| DTC | Item | Content of diagnosis | Note |
|---|---|---|---|
| B1601 | In-Vehicle Sensor Short | In-vehicle air temperature sensor circuit is shorted. | Refer to , DTC B1601 IN-VEHICLE SENSOR SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1602 | In-Vehicle Sensor Open | In-vehicle air temperature sensor circuit is open. | Refer to , DTC B1602 IN-VEHICLE SENSOR OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1603 | Evaporator Sensor Circuit Short | Evaporator sensor circuit is shorted. | Refer to , DTC B1603 EVAPORATOR SENSOR SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1604 | Evaporator Sensor Circuit Open | Evaporator sensor circuit is open. | Refer to , DTC B1604 EVAPORATOR SENSOR OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1605 | Refrigerant Pressure Sensor Circuit Open | Pressure sensor circuit is open. | Displays current malfunction only. Refer to , DTC B1605 REFRIGERANT FLOW SENSOR CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1606 | Refrigerant Pressure Sensor Circuit Short | Pressure sensor circuit is shorted. | Displays current malfunction only. Refer to , DTC B1606 REFRIGERANT FLOW SENSOR CIRCUIT SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1607 | Sunload Sensor Short |
|
Refer to , DTC B1607 SUNLOAD SENSOR SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1608 | Sunload Sensor Open | Sunload sensor circuit is open. | Displays current malfunction only. Refer to , DTC B1608 SUNLOAD SENSOR OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1610 | Airmix Door Actuator - Potentiometer Circuit Open (Driver's) | Airmix door actuator - potentiometer circuit is open. | Refer to , DTC B1610 AIRMIX DOOR ACTUATOR POTENTIOMETER CIRCUIT OPEN (DRIVER'S) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1611 | Airmix Door Actuator - Potentiometer Circuit Short (Driver's) | Airmix door actuator - potentiometer circuit is shorted. | Refer to , DTC B1611 AIRMIX DOOR ACTUATOR POTENTIOMETER CIRCUIT SHORT (DRIVER'S) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1612 | Airmix Door Actuator - Lock (Driver's) | Mode door actuator is locked. | Refer to , DTC B1612 AIRMIX DOOR ACTUATOR LOCK (DRIVER'S) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1613 | Airmix Door Actuator - Potentiometer Circuit Open (Passenger's) | Airmix door actuator - potentiometer circuit is open. | Refer to , DTC B1613 AIRMIX DOOR ACTUATOR POTENTIOMETER CIRCUIT OPEN (PASSENGER'S) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1614 | Airmix Door Actuator - Potentiometer Circuit Short (Passenger's) | Airmix door actuator - potentiometer circuit is shorted. | Refer to , DTC B1614 AIRMIX DOOR ACTUATOR POTENTIOMETER CIRCUIT SHORT (PASSENGER'S) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1615 | Airmix Door Actuator - Lock (Passenger's) | Mode door actuator is locked. | Refer to , DTC B1615 AIRMIX DOOR ACTUATOR LOCK (PASSENGER'S) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1620 | Mode Door Actuator - Potentiometer Circuit Open | Mode door actuator - potentiometer circuit is open. | Refer to , DTC B1620 MODE DOOR ACTUATOR POTENTIOMETER CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1621 | Mode Door Actuator - Potentiometer Circuit Short | Mode door actuator - potentiometer circuit is shorted. | Refer to , DTC B1621 MODE DOOR ACTUATOR POTENTIOMETER CIRCUIT SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1622 | Mode Door Actuator - Lock | Mode door actuator is locked. | Refer to , DTC B1622 MODE DOOR ACTUATOR LOCK , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U0001 | CAN Communication Bus Off | CAN communication bus off | Displays current malfunction only. Refer to , DTC U0001 CAN COMMUNICATION BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U0002 | CAN Communication Error | CAN communication error Displays current malfunction only. | Refer to , DTC U0002 CAN COMMUNICATION ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U0028 | Heater Control Panel Communication Error | Communication with heater control panel is faulty. Displays current malfunction only. | Refer to , DTC U0028 HEATER CONTROL PANEL COMMUNICATION ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1641 | Refrigerant Flow Sensor Circuit Short | Refrigerant flow sensor circuit is shorted. | Displays current malfunction only. Refer to , DTC B1641 REFRIGERANT FLOW SENSOR CIRCUIT SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1642 | Refrigerant Flow Sensor Circuit Open | Refrigerant flow sensor circuit is open. | Displays current malfunction only. Refer to , DTC B1642 REFRIGERANT FLOW SENSOR CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1643 | Variable Flow Change Solenoid Duty Circuit abnormal | Variable flow change solenoid duty circuit is open or shorted. | Displays current malfunction only. Refer to , DTC B1643 VARIABLE FLOW CHANGE SOLENOID DUTY CIRCUIT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| B1644 | Refrigerant not sealed drive error | Compressor is rotated before filling refrigerant. | Displays when delivery mode only. Refer to , DTC B1644 REFRIGERANT NOT SEALED DRIVE ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
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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