Powertrain, generic (extended)

P2446 AIR System Pump Stuck On (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2446 is the bank 2 entry for a secondary air pump that keeps running after being switched off. The code is meaningful only on engines with a separate pump per cylinder bank or where the system reports pump faults per bank; no manufacturer documents this code publicly. By analogy with GM's bank 1 code P2444, the check would run after the pump is commanded off and look for duct pressure that stays above the model, which points to a stuck relay, a shorted driver or a pump with an internal fault. Under CARB rules, AIR pumps, relays and valves count as comprehensive components and need their own monitoring. A pump that never stops can overheat, wear out quickly and load the battery. P2447 is the stuck-off code for bank 2; P2444 covers bank 1.

Likely causes

Relay of the bank 2 pump stuck closed
Control circuit shorted to power
Faulty output driver in the engine computer

Symptoms

  • Check engine lamp
  • Pump keeps humming after the warm-up phase

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–600
Time0.3–2 h

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

Parts involved

secondary air pump b2secondary air relay

Related codes

P2444P2447P0418

References: law.cornell.edu, gsi.ext.gm.com.