P2447 code meaning
AIR System Pump Stuck Off (Bank 2)
Powertrain system Generic code P24xx codes Check engine light
What P2447 means
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.
P2447 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2447
- Check engine lamp after a cold start
- Readiness for secondary air not set
Common causes of P2447
- Most likelyBank 2 pump seized after water ingress
- PossibleBlown fuse or failed relay of the bank 2 pump
- PossibleCorroded pump connector or open ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Secondary air pump b2Secondary air relay
What each part of P2447 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 47 | The exact fault in that area. |
What to do next
- Note P2447 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2447
What does P2447 mean?
P2447 means "AIR System Pump Stuck Off (Bank 2)". P2447 indicates that the bank 2 secondary air pump does not deliver air when commanded. It is a generic code, so it means the same on every make.
Is it safe to drive with P2447?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2447 fail an emissions test?
Yes, it can. P2447 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2447 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2447 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.