This code indicates that the engine computer has detected an unusually high volume of air flowing through the secondary air injection system on Bank 1. This system pumps extra air into the exhaust during cold starts to reduce emissions, and excessive airflow usually points to a mechanical or electrical fault allowing air or current to flow unchecked.
The mechanical valve that directs air into the exhaust can stick open, allowing continuous airflow instead of closing when the system turns off.
If the relay that controls the pump shorts closed, it will supply continuous power to the pump, causing it to run and force air into the system when it should be off.
A short in the wiring to the air injection pump or solenoid can cause the components to operate continuously, triggering the high flow condition.
The sensor that monitors airflow might report erroneously high readings if it has failed or is reading inaccurately due to moisture or carbon contamination.
Extremely rare, but the engine computer could internally short and command the secondary air system on continuously.
You can usually drive it short-term, but the secondary air pump running continuously can drain the battery, overheat the pump, or cause a rough idle. It should be diagnosed soon.
Not necessarily. Because the code is for *high* airflow, the pump is likely working too well because it is running when it should not be, or the valve directing the air is stuck open.
Probably not. Replacing the PCM/ECM for a P2448 code is almost always a misdiagnosis. The root cause is almost always a stuck relay, stuck check valve, or wiring issue.
This is usually caused by a stuck closed (shorted) air injection pump relay, which keeps supplying battery power to the pump even when the ignition is off.