P2447: AIR System Pump Stuck Off (Bank 2)

P2447 indicates that the bank 2 secondary air pump does not deliver air when commanded. No manufacturer publicly documents this code; Toyota and Lexus, whose V6 and V8 trucks feed both banks from one pump through two valves, log a dead pump as P2445. On designs with a separate pump per bank, the cause usually lies with the second pump: a blown fuse, a failed relay, a corroded plug or a motor seized after water got in. CARB requires detection of a system that delivers too little or no air before cold-start emissions climb past the limit. Driving is unaffected; what suffers is the readiness status and the emissions after a cold start. P2446 is the stuck-on code for the same bank.

Low severity. Can I keep driving?Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

Check engine lamp after a cold start
Readiness for secondary air not set

Most likely causes

Bank 2 pump seized after water ingress
Blown fuse or failed relay of the bank 2 pump
Corroded pump connector or open ground

What to check, in order

Start with the simplest. You can tick off each step.

Listen for the pump running during a cold start
Use the scanner to command the movement and compare the actual position with the requested one.
Check the fuse and relay
Inspect the hoses and valve for moisture or carbon
Run the actuator test with the scanner

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P2447 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
4: Emissions
47: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2447?

Yes, you can keep driving, though it should be repaired: the car pollutes more at startup and may not pass an inspection.

What causes code P2447?

The most common causes are: bank 2 pump seized after water ingress; blown fuse or failed relay of the bank 2 pump; corroded pump connector or open ground.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.