Code Definition

B0162 — Ambient air temperature sensor signal error

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

About B0162

B0162 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 B0162 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 B0162 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

DTC B0162 sets when the HVAC or body control module detects an invalid or implausible signal from the ambient air temperature sensor #2 circuit — the secondary AAT input used on vehicles equipped with dual ambient temperature sensors or a separate sensor for the rear / auxiliary climate control zone. The sensor is a negative temperature coefficient thermistor that returns a varying voltage to the control module proportional to outside air temperature, and that reading is used to support automatic climate control logic, ambient temperature display averaging and various engine compensation str...

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