What causes a P0072 code?

P0072 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0072 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0072 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0072

Ambient Air Temperature Sensor Circuit Low Input

What it means

The Engine Control Module (ECM) detects a voltage signal from the ambient air temperature (AAT) sensor that is lower than the calibrated threshold, typically indicating a short to ground or a failed sensor.