Code Definition

P0073 — Ambient Air Temperature Sensor Circuit High

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

About P0073

P0073 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0073 is stored, the module has detected a signal or supply voltage higher than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0073 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 P0073 code indicates a high input condition in the ambient air temperature sensor circuit. This sensor is responsible for measuring the temperature of the air outside the vehicle and provides this data to the Engine Control Module (ECM). The sensor's input is essential for the operation of various systems, such as the climate control and engine management systems. A high input signal from the ambient air temperature sensor might indicate that the sensor is malfunctioning or there is an issue in the circuit.

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