Code Definition

B1855 — Climate Control Air Temperature Internal Sensor Motor Circuit Short To Battery

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

About B1855

B1855 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 B1855 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.

B1855 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 cabin air temperature sensor for automatic blend door and fan control, and the sensor assembly includes a small aspirator motor that the module drives to circulate cabin air across the thermistor for accurate temperature sampling. DTC B1855 is set when the climate control module detects the aspirator motor drive circuit shorted to battery voltage, meaning the supply or driver line is being held at 12V even when the motor should not be commanded on, or it sees an overcurrent condition consistent with a hard short to a power feed. When this code i...

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