LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2021 >> Forester Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> HVAC System DTCS
April 5, 2026: LEMON Manuals is launched! Read the announcement.

HVAC System DTCS

HVAC SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

Code Reference
B1430 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1430 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT OPEN .
B1431 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT .
B1432 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1432 AMBIENT TEMPERATURE SENSOR CIRCUIT OPEN (AIR-CONDITIONER) .
B1433 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER) .
B1434 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN .
B1435 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1435 EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT .
B1436 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1436 AIR MIX DOOR ACTUATOR CIRCUIT OPEN (PASSENGER) .
B1437 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1437 AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (PASSENGER) .
B1438 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1438 MODE DOOR ACTUATOR CIRCUIT OPEN .
B1439 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1439 MODE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT .
B1440 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1440 AIR MIX DOOR ACTUATOR CIRCUIT OPEN (DRIVER) .
B1442 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1442 AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (DRIVER) .
B14A1 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14A1 SUNLOAD SENSOR CIRCUIT LOW/OPEN .
When the sunload sensor inspection is performed indoors or in the shade, it may be diagnosed as having an open circuit due to an insufficient light volume. In this case, check the sunload sensor at a location exposed to direct sunlight.
B14A2 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14A2 SUNLOAD SENSOR CIRCUIT SHORT-CIRCUIT . When the sunload sensor inspection is performed indoors or in the shade, it may be diagnosed as having an open circuit due to an insufficient light volume. In this case, check the sunload sensor at a location exposed to direct sunlight.
B14A3 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14A3 REFRIGERANT PRESSURE SENSOR CIRCUIT OPEN .
B14A4 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14A4 REFRIGERANT PRESSURE SENSOR CIRCUIT SHORT-CIRCUIT .
B14A7 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14A7 VARIABLE SOLENOID VALVE CIRCUIT .
B14A8 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14A8 COMPRESSOR BREAK-IN MALFUNCTION LOW REFRIGERANT .
B14EE Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14EE REFRIGERANT PRESSURE SENSOR CIRCUIT OPEN (HOSE PRESSURE DISCHARGE) .
B14EF Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14EF REFRIGERANT PRESSURE SENSOR CIRCUIT SHORT-CIRCUIT (HOSE PRESSURE DISCHARGE)
B14E7 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14E7 HEATER CORE SENSOR CIRCUIT OPEN .
B14E8 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14E8 HEATER CORE SENSOR CIRCUIT SHORT-CIRCUIT .
B14E9 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14E9 INTAKE DOOR ACTUATOR CIRCUIT OPEN .
B14EA Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14EA INTAKE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT .
B14EB Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14EB INTAKE DOOR ACTUATOR STUCK .
B14EC Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14EC HUMIDITY SENSOR CIRCUIT OPEN .
B14ED Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B14ED HUMIDITY SENSOR CIRCUIT SHORT .
U0073 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF .
U0100 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" .
U0122 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE .
U0140 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE .
U0151 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0151 LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULE .
U0155 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE .
U0156 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0156 LOST COMMUNICATION WITH INFORMATION CENTER "A" .
U0401 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" .
U0416 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE .
U0422 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE .
U0423 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE .
U0452 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0452 INVALID DATA RECEIVED FROM RESTRAINTS CONTROL MODULE .
U0457 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0457 INVALID DATA RECEIVED FROM INFORMATION CENTER "A" .
U1120 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE .
U123A Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U123A LOST COMMUNICATION WITH DRIVER MONITORING SYSTEM .
U143A Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U143A INVALID DATA RECEIVED FROM DRIVER MONITORING SYSTEM .
U1469 Ref. to AIR CONDITIONER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1469 INVALID DATA RECEIVED FROM AUTOSTART STOP CONTROL MODULE .