What causes a P2220 code?

P2220 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 P2220 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2220 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

P2220

Ambient Air Pressure Sensor Circuit Low

What it means

The Engine Control Module (ECM) detects a circuit voltage below the minimum calibrated threshold for the barometric or atmospheric pressure sensor. This sensor is critical for calculating fuel delivery and turbocharger boost levels based on altitude.