Diagnostic trouble code P2447 indicates that the secondary air injection (SAI) pump on engine bank 2 is not operating when commanded by the powertrain control module (PCM). This system pumps fresh air into the exhaust to reduce cold-start emissions; a 'stuck off' condition means the pump fails to run, often due to a mechanical or electrical fault.
The pump itself is the most common failure point. Internal brush wear, seized bearings, or electrical winding failure prevent it from turning.
A blown fuse or defective relay cuts power to the pump, causing it to remain off. Check the fuse box and relay for the secondary air system.
Corroded, broken, or loose wires/connectors at the pump or relay can interrupt power or ground, leaving the pump inoperative.
Some systems use vacuum to operate a switching valve; a leak or blockage can prevent air from reaching the exhaust, but the pump itself may still run.
The PCM rarely fails. Only consider this after thoroughly testing all other components and circuits, as misdiagnosis is common.
Yes, the vehicle will usually run and drive normally, but the check engine light will stay on and you may fail an emissions test. The secondary air system only operates during cold starts, so drivability is rarely affected.
Most likely yes. The pump is the most common failure for this code. However, always verify power, ground, and fuses first to avoid replacing a good pump.
No. The PCM is rarely the cause. Many drivers are told to replace the PCM, but that is usually wrong. The pump, relay, or wiring is almost always the problem.
Bank 2 refers to the side of the engine that does not contain cylinder #1. In V6/V8 engines, bank 2 is typically the passenger side (in most front-wheel-drive vehicles) or the left side (in rear-wheel-drive vehicles). Check your vehicle's service manual for exact location.