Code Definition

P0074 — Ambient Air Temperature Sensor Circuit Intermittent

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

About P0074

P0074 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 P0074 is stored, the module has detected 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 P0074 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 P0074 code indicates an intermittent fault in the ambient air temperature sensor circuit. This sensor measures the temperature of the air outside the vehicle and provides the data to the Engine Control Module (ECM) for use in various control systems, including climate control and engine management. An intermittent fault in this circuit suggests irregular signal transmission, which can lead to inconsistent readings and affect the performance of systems relying on this data.

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