MODE 01 · PID 46

Ambient air temperature

The reported ambient-air channel can be filtered or affected by vehicle location and heat soak. It is not a calibrated weather-station reading.

Formula
A − 40
Data bytes
1
Units
°C

A worked decoding example

Request: 01 46

Response: 41 46 41

Data: 41 → 25 °C

The example shows service, PID and data only. It omits adapter headers, CAN identifier, length and padding. It is not a live vehicle reading.

Reading context

Compare after an appropriate stabilisation period. Distinguish the ambient channel from intake-air and coolant temperatures.

A decoded value is a measurement, not a diagnosis. Encoding limits are not normal operating limits. Confirm vehicle support and the manufacturer’s procedure.

Byte decoder

Your input stays in this browser.MODE 01

FormulaA − 40 → °C

A decoded value is a measurement, not a diagnosis. Encoding limits are not normal operating limits. Confirm vehicle support and the manufacturer’s procedure.

Sources

  1. python-OBD: Mode 01 command table ↗
  2. python-OBD: byte decoding implementation ↗
  3. CSS Electronics: OBD-II PID and response frames ↗
  4. California BAR: OBD test reference ↗

Independent reference; no affiliation with SAE, vehicle manufacturers or regulators. Sources checked 28 October 2026.