HVAC System DTCS
HVAC SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Detection Item or Symptom |
|---|---|
| B121A | An open in the mode control motor circuit |
| B121B | A short in the mode control motor circuit |
| B121D | Humidity/in-car temperature sensor communication error |
| B1220 | A short in the recirculation control motor circuit |
| B1227 | An open in the outside air temperature sensor circuit |
| B1228 | A short in the outside air temperature sensor circuit |
| B1229 | An open in the sunlight sensor circuit |
| B1230 | A short in the sunlight sensor circuit |
| B1231 | An open in the evaporator temperature sensor circuit |
| B1232 | A short in the evaporator temperature sensor circuit |
| B1233 | An open in the air mix control motor circuit (driver's) |
| B1234 | A short in the air mix control motor circuit (driver's) |
| B1235 | A problem in the air mix control motor circuit, linkage, door, or motor (driver's) |
| B1236 | An open in the passenger's air mix control motor circuit |
| B1237 | A short in the passenger's air mix control motor circuit |
| B1238 | A problem in the passenger's air mix control motor circuit, linkage, door, or motor |
| B1240 | A problem in the mode control motor circuit, linkage, door, or motor |
| B1241 | A problem in the blower motor circuit |
| B2969 | Climate control unit lost communication with MICU (WIPSW message) |
| B2983 | A problem in the recirculation control motor circuit, linkage, door, or motor |
| B2986 | An open in the recirculation control motor circuit |
| U1280 | Communication bus line error (BUS-OFF) |
| U128D | Lost communication with gauge control module (climate control unit) |