What causes a P2446 code?

P2446 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 P2446 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2446 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

P2446

Secondary Air Injection System Pump Stuck Off

What it means

The Engine Control Module detects that the Secondary Air Injection pump is not operating correctly or flow is insufficient, usually during the engine warm-up cycle.