Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2023 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
Climate Control System DTCS
| DTC | Description |
|---|---|
| DTC Troubleshooting: B1213 (0B) | An open in the rear evaporator temperature sensor circuit |
| DTC Troubleshooting: B1214 (0C) | A short in the rear evaporator temperature sensor circuit |
| DTC Troubleshooting: B1220 (56) | A short in the recirculation control motor circuit |
| DTC Troubleshooting: B1221 (50) | An open in the rear mode control motor circuit |
| DTC Troubleshooting: B1222 (51) | A short in the rear mode control motor circuit |
| DTC Troubleshooting: B1223 (60) | A problem in the rear blower motor circuit |
| DTC Troubleshooting: B1225 (01) | An open in the in-car temperature sensor circuit |
| DTC Troubleshooting: B1226 (02) | A short in the in-car temperature sensor circuit |
| DTC Troubleshooting: B1227 (05) | An open in the outside air temperature sensor circuit |
| DTC Troubleshooting: B1228 (06) | A short in the outside air temperature sensor circuit |
| DTC Troubleshooting: B1229 (17) | An open in the sunlight sensor circuit |
| DTC Troubleshooting: B1230 (17) | A short in the sunlight sensor circuit |
| DTC Troubleshooting: B1231 (09) | An open in the evaporator temperature sensor circuit (front) |
| DTC Troubleshooting: B1232 (0A) | A short in the evaporator temperature sensor circuit (front) |
| DTC Troubleshooting: B1233 (40) | An open in the air mix control motor circuit (driver's) |
| DTC Troubleshooting: B1234 (41) | A short in the air mix control motor circuit (driver's) |
| DTC Troubleshooting: B1235 (42) | A problem in the air mix control motor circuit, linkage, door, or motor (driver's) |
| DTC Troubleshooting: B1236 (43) | An open in the passenger's air mix control motor circuit |
| DTC Troubleshooting: B1237 (44) | A short in the passenger's air mix control motor circuit |
| DTC Troubleshooting: B1238 (45) | A problem in the passenger's air mix control motor circuit, linkage, door, or motor |
| DTC Troubleshooting: B123F | Automatic lighting control unit/sunlight sensor error |
| DTC Troubleshooting: B1241 (59) | A problem in the blower motor circuit (front) |
| DTC Troubleshooting: B1244 (46) | An open in the rear air mix control motor circuit |
| DTC Troubleshooting: B1245 (47) | A short in the rear air mix control motor circuit |
| DTC Troubleshooting: B1246 (48) | A problem in the rear air mix control motor circuit, linkage, door, or motor |
| DTC Troubleshooting: B1248 (52) | A problem in the rear mode control motor circuit, linkage, door, or motor |
*1: With automatic wiper
*2: Without automatic wiper
*3: With second row seat heater
| DTC | Description |
|---|---|
| DTC Troubleshooting: B2966 (8A) | Climate control unit lost communication with rear panel (rear climate control panel) |
| DTC Troubleshooting: B2967 (20) | An open in the humidity sensor circuit |
| DTC Troubleshooting: B2968 (21) | A short in the humidity sensor circuit |
| DTC Troubleshooting: B2969 (49) | An open in the mode control motor A circuit (front) |
| DTC Troubleshooting: B2970 (4A) | A short in the mode control motor A circuit (front) |
| DTC Troubleshooting: B2971 (4B) | A problem in the mode control motor A circuit, linkage, door, or motor (front) |
| DTC Troubleshooting: B2972 (4C) | An open in the mode control motor B circuit (front) |
| DTC Troubleshooting: B2973 (4D) | A short in the mode control motor B circuit (front) |
| DTC Troubleshooting: B2974 (4E) | A problem in the mode control motor B circuit, linkage, door, or motor (front) |
| DTC Troubleshooting: B2983 (57) | A problem in the recirculation control motor circuit, linkage, door, or motor |
| DTC Troubleshooting: B2986 (55) | An open in the recirculation control motor circuit |
| DTC Troubleshooting: B2988 (61) | A problem in the A/C compressor variable capacity control solenoid circuit |
| DTC Troubleshooting: U1280 (80) (Climate Control Unit) | Communication bus line error (BUS-OFF) |
| DTC Troubleshooting: U1281 (91) (Climate Control Unit) | Climate control unit lost communication with MICU (body control module) |
| DTC Troubleshooting: U128D (83) (Climate Control Unit) | Climate control unit lost communication with gauge control module |
| DTC Troubleshooting: U1290 (8F) (Climate Control Unit) | Climate control unit lost communication with seat heater control unit (front) |
| DTC Troubleshooting: U129B (90) (Climate Control Unit) | Climate control unit lost communication with seat heater control unit (second row seat) |
*1: With automatic wiper
*2: Without automatic wiper
*3: With second row seat heater
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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