Code Definition

B0193 — Humidity Sensor Circuit

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B0193

B0193 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0193 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.

Because B0193 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The humidity sensor is part of the automatic climate control system and measures relative humidity inside the cabin, usually as a combined temperature-and-humidity element mounted in a housing near the windshield header, rear-view mirror base, or in the HVAC intake duct. The HVAC or Body Control Module uses the humidity signal together with cabin temperature and windshield glass temperature to predict the fog point and automatically manage the A/C compressor, blower speed, and recirculation flap to prevent the windshield from misting up. DTC B0193 is set when the module detects that the humidi...

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