Code Definition

B1250 — Air Temperature Internal Sensor Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1250

B1250 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1250 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1250 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The internal air temperature sensor, also called the cabin temperature sensor, reports cabin air temperature to the climate control module so that automatic temperature control can regulate discharge temperature and blower speed toward the driver's set point. The sensor is a negative temperature coefficient (NTC) thermistor that varies resistance with temperature, and many installations include a small aspirator fan that continuously draws cabin air across the sensor element for a representative reading. DTC B1250 sets when the climate control module detects that the sensor signal voltage is o...

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