Code Definition

B1252 — Air Temperature Internal Sensor Circuit Short To Battery

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

About B1252

B1252 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 B1252 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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.

B1252 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, is an NTC thermistor that reports cabin air temperature back to the climate control module for use by the automatic climate control system. The sensor signal normally sits at a low voltage that results from the module's 5V reference being divided down through the thermistor's internal resistance. DTC B1252 sets when the module detects that the signal voltage has risen to battery level rather than the expected divided voltage, indicating the signal or reference circuit has shorted to a 12V source somewhere between th...

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