HVAC System DTCS
HVAC SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) INDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B121A | An open in the mode control motor circuit | Signal error |
| B121B | A short in the mode control motor circuit | Signal error |
| B121D | Humidity/In-car temperature sensor communication error | Loss of communication |
| B1220 | A short in the recirculation control motor circuit | Signal error |
| B1227 | An open in the outside air temperature sensor circuit | Signal error |
| B1228 | A short in the outside air temperature sensor circuit | Signal error |
| B1229 | An open in the sunlight sensor circuit | Signal error |
| B122A | An open in the air quality sensor circuit | Signal error |
| B122B | A short in the air quality sensor circuit | Signal error |
| B122C | Air quality sensor internal error | Signal error |
| B122D | An open in the rear temperature control dial circuit | Signal error |
| B122E | A short in the rear temperature control dial circuit | Signal error |
| B122F | An open in the windshield defrost switch circuit | Signal error |
| B1230 | A short in the sunlight sensor circuit | Signal error |
| B1231 | An open in the evaporator temperature sensor circuit | Signal error |
| B1232 | A short in the evaporator temperature sensor circuit | Signal error |
| B1233 | An open in the air mix control motor circuit (driver's) | Signal error |
| B1234 | A short in the air mix control motor circuit (driver's) | Signal error |
| B1235 | A problem in the air mix control motor circuit, linkage, door, or motor (driver's) | Signal error |
| B1236 | An open in the passenger's air mix control motor circuit | Signal error |
| B1237 | A short in the passenger's air mix control motor circuit | Signal error |
| B1238 | A problem in the passenger's air mix control motor circuit, linkage, door, or motor | Signal error |
| B123A | An open in the passenger's mode control motor circuit | Signal error |
| B123B | A short in the passenger's mode control motor circuit | Signal error |
| B1240 | A problem in the mode control motor circuit, linkage, door, or motor | Signal error |
| B1241 | A problem in the blower motor circuit | Signal error |
| B1243 | A problem in the passenger's mode control motor circuit, linkage, door, or motor | Signal error |
| B1244 | An open in the rear air mix control motor circuit | Signal error |
| B1245 | A short in the rear air mix control motor circuit | Signal error |
| B1246 | A problem in the rear air mix control motor circuit, linkage, door, or motor | Signal error |
| B2979 | An open in the A/C pressure sensor circuit | Signal error |
| B2980 | A short in the A/C pressure sensor circuit | Signal error |
| B2983 | A problem in the recirculation control motor circuit, linkage, door, or motor | Signal error |
| B2986 | An open in the recirculation control motor circuit | Signal error |
| B2988 | A problem in the A/C compressor variable capacity control solenoid circuit | Signal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Lost communication with MICU (climate control unit) | Loss of communication |
| U128D | Lost communication with gauge control module (climate control unit) | Loss of communication |
| U1291 | Lost communication with relay control module (climate control unit) | Loss of communication |