What causes a P2448 code?

P2448 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 P2448 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2448 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

P2448

Secondary Air Injection System High Flow Bank 1

What it means

The Engine Control Module has detected an excessively high airflow rate within the secondary air injection system, often caused by a faulty blower or pressure sensor error.