Climate Control System DTC Troubleshooting Index
DTC
Detection Item or Symptom
ECU
DTC Type
U1280
Communication bus line error (BUS-OFF)
Climate control unit
Loss of communication
U1281
Lost Communication with MICU
Climate control unit
Loss of communication
U128D
Lost communication with gauge control module (climate control unit)
Climate control unit
Loss of communication
B121A
An open in the mode control motor circuit
Climate control unit
Signal error
B121B
A short in the mode control motor circuit
Climate control unit
Signal error
B1220
A short in the recirculation control motor circuit
Climate control unit
Signal error
B1225
An open in the in-car temperature sensor circuit
Climate control unit
Signal error
B1226
A short in the in-car temperature sensor circuit
Climate control unit
Signal error
B1227
An open in the outside air temperature sensor circuit
Climate control unit
Signal error
B1228
A short in the outside air temperature sensor circuit
Climate control unit
Signal error
B1229
An open in the sunlight sensor circuit
Climate control unit
Signal error
B1230
A short in the sunlight sensor circuit
Climate control unit
Signal error
B1231
An open in the evaporator temperature sensor circuit
Climate control unit
Signal error
B1232
A short in the evaporator temperature sensor circuit
Climate control unit
Signal error
B1233
An open in the air mix control motor circuit (driver's)
Climate control unit
Signal error
B1234
A short in the air mix control motor circuit (driver's)
Climate control unit
Signal error
B1235
A problem in the air mix control motor circuit, linkage, door, or motor (driver's)
Climate control unit
Signal error
B1236
An open in the passenger's air mix control motor circuit
Climate control unit
Signal error
B1237
A short in the passenger's air mix control motor circuit
Climate control unit
Signal error
B1238
A problem in the passenger's air mix control motor circuit, linkage, door, or motor
Climate control unit
Signal error
B1240
A problem in the mode control motor circuit, linkage, door, or motor
Climate control unit
Signal error
B1241
A problem in the blower motor circuit
Climate control unit
Signal error
B2983
A problem in the recirculation control motor circuit, linkage, door, or motor
Climate control unit
Signal error
B2986
An open in the recirculation control motor circuit
Climate control unit
Signal error