P0072 - Ambient Air Temperature Sensor Circuit Low

System Information

Ambient Air Temperature sensors can be used by the ECM for emission control systems and by other vehicle control systems for driver information and climate control.

Fault Code Explained

This fault code indicates that the ECM has detected a signal value that is below the lower parameter threshold. This fault is likely to be caused by a faulty sensor, a short to earth or a supply / signal voltage fault.

Recommended Tests

If possible use a diagnostic computer to view live data readings for the sensor.
Test the supply voltage and sensor output checking for: