LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2024 >> BRZ Premium >> 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

DTC Description & trouble part Reference
B1430 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT OPEN Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1430 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT OPEN .
B1431 IN-VEHICLE (POST EVAPORATOR)
TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT
Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT .
B1432 AMBIENT TEMPERATURE SENSOR CIRCUIT OPEN (AIR-CONDITIONER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1432 AMBIENT TEMPERATURE SENSOR CIRCUIT OPEN (AIR-CONDITIONER) .
B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER) .
B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN .
B1435 EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1435 EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT .
B1436 AIR MIX DOOR ACTUATOR CIRCUIT OPEN (PASSENGER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1436 AIR MIX DOOR ACTUATOR CIRCUIT OPEN (PASSENGER) .
B1437 AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (PASSENGER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1437 AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (PASSENGER) .
B1438 MODE DOOR ACTUATOR CIRCUIT OPEN Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1438 MODE DOOR ACTUATOR CIRCUIT OPEN .
B1439 MODE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1439 MODE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT .
B1440 AIR MIX DOOR ACTUATOR CIRCUIT OPEN (DRIVER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1440 AIR MIX DOOR ACTUATOR CIRCUIT OPEN (DRIVER) .
B1441 AIR MIX DOOR ACTUATOR CIRCUIT STUCK (PASSENGER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1441 AIR MIX DOOR ACTUATOR CIRCUIT STUCK (PASSENGER) .
B1442 AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (DRIVER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1442 AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (DRIVER) .
B1443 MODE DOOR ACTUATOR CIRCUIT STUCK Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1443 MODE DOOR ACTUATOR CIRCUIT STUCK .
B1446 AIR MIX DOOR ACTUATOR CIRCUIT STUCK (DRIVER) Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1446 AIR MIX DOOR ACTUATOR CIRCUIT STUCK (DRIVER) .
B14 A1 SUNLOAD SENSOR CIRCUIT LOW/OPEN 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 SUNLOAD SENSOR CIRCUIT SHORT-CIRCUIT 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.
U0073 CONTROL MODULE COMMUNICATION BUS OFF Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF .
U0100 LOST COMMUNICATION WITH ECM/PCM "A" Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" .
U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE .
U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE .
U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC)
CONTROL MODULE
Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE .
U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" .
U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE .
U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE .
U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE .
U1146 LOST COMMUNICATION WITH GATEWAY "A" BODY-CAN Ref. to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U1146 LOST COMMUNICATION WITH GATEWAY "A" BODY-CAN .