Code Definition

B1853 — Climate Control Air Temperature Internal Sensor Motor Circuit Failure

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

About B1853

B1853 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 B1853 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.

B1853 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 climate control module relies on an interior air temperature sensor, often mounted in the dash, to measure actual cabin temperature for automatic blend door and fan control. To ensure accurate sampling rather than reading dead air around the sensor, the assembly includes a small aspirator motor (sometimes called the cabin sensor motor or aspirator fan) that continuously draws cabin air across the thermistor. DTC B1853 is set when the climate control module detects a general failure in the aspirator motor drive circuit, such as the commanded motor not drawing current, drawing excessive curr...

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