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Home >> Honda >> 2021 >> Ridgeline RTL, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Diagnostics (B1213 - B1244) >> DTC Troubleshooting Index >> Climate Control System DTC Troubleshooting Index (2017 2018 2019)

Climate Control System DTC Troubleshooting Index (2017 2018 2019)

DTC  Detection Item or Symptom  ECU  DTC Type 
U0180 Climate Control Unit Lost communication with automatic lighting control unit-sensor Climate control unit Loss of communication
U1280 Communication bus line error (BUS-OFF) Climate control unit Loss of communication
U1281 Climate Control Unit Lost Communication with MICU (climate control unit) Climate control unit Loss of communication
U128D Climate Control Unit Lost communication with gauge control module (climate control unit) Climate control unit Loss of communication
U1290 Climate Control Unit Lost Communication With Seat Heater Control Unit (front) Climate control unit Loss of communication
U129B Climate Control Unit Lost Communication With Seat Heater Control Unit (rear seat) Climate control unit Loss of communication
B1213  An open in the rear evaporator temperature sensor circuit Climate control unit Signal error
B1214  A short in the rear evaporator temperature sensor circuit Climate control unit Signal error
B1220  A short in the recirculation control motor circuit Climate control unit Signal error
B1221  An open in the rear mode control motor circuit Climate control unit Signal error
B1222  A short in the rear mode control motor circuit Climate control unit Signal error
B1223  A problem in the rear blower 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 (front) Climate control unit Signal error
B1232  A short in the evaporator temperature sensor circuit (front) 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
DTC  Detection Item or Symptom  ECU  DTC Type 
B123F  Automatic lighting control unit/sunlight sensor error Climate control unit Internal error
B1241  A problem in the blower motor circuit (front) Climate control unit Signal error
B1244  An open in the rear air mix control motor circuit Climate control unit Signal error
B1245 A short in the rear air mix control motor circuit Climate control unit Signal error
B1246 A problem in the rear air mix control motor circuit, linkage, door, or motor Climate control unit Signal error
B1248 A problem in the rear mode control motor circuit, linkage, door, or motor Climate control unit Signal error
B2964 Climate control unit lost communication with Front PANEL Climate control unit Loss of communication
B2966 Climate control unit lost communication with Rear PANEL Climate control unit Loss of communication
B2967 An open in the humidity sensor circuit Climate control unit Signal error
B2968 A short in the humidity sensor circuit Climate control unit Signal error
B2969 An open in the mode control motor A circuit (front) Climate control unit Signal error
B2970 A short in the mode control motor A circuit (front) Climate control unit Signal error
B2971 A problem in the mode control motor A circuit, linkage, door, or motor (front) Climate control unit Signal error
B2972 An open in the mode control motor B circuit (front) Climate control unit Signal error
B2973 A short in the mode control motor B circuit (front) Climate control unit Signal error
B2974 A problem in the mode control motor B circuit, linkage, door, or motor (front) Climate control unit Signal error
B2979 An open in the A/C pressure sensor circuit Climate control unit Signal error
B2980 A short in the A/C pressure sensor 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