Powertrain, generic (extended)

P2447 AIR System Pump Stuck Off (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

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

Symptoms

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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–1,000
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

secondary air pump b2secondary air relay

Related codes

P2445P2446P0418P0492

References: law.cornell.edu, static.nhtsa.gov.