P2444: How to Diagnose & Fix — Secondary Air Injection System Pump Stuck On (Bank 1)
4 vehicles · 2 makes · $300-$3,000 repair
How to diagnose and fix P2444: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Toyota Sequoia · 2008–2019
2nd-gen Sequoias with the 5.7L 3UR-FE also suffer from secondary air injection pump failures, similar to the 1st gen but with updated part numbers. The pump seizes from internal moisture corrosion, triggering P2440-P2445 codes and check engine light.
Common Symptoms
- Check engine light with P2440-P2445 codes
- Loud buzzing or grinding on cold start
- Air pump not engaging on startup
- Failed emissions test
How to Fix
Replace secondary air injection pump (Toyota 17610-0S010 or Dorman 306-058). Replace air switching valves if corroded. Aftermarket pumps are available at lower cost. Some owners install check valves in the air line to prevent moisture backflow into the pump.
Toyota 4Runner · 2005–2009
The 4.7L 2UZ-FE V8 used in later 4th-generation 4Runners is known for secondary air injection system failures involving the air pump and switching valves. When the system sticks or fails electrically, the truck may illuminate the check engine light and enter reduced-power or limp mode. This problem is widely documented across Toyota V8 trucks and SUVs of the era and can be very expensive when repaired with OEM components.
Common Symptoms
- check engine light
- reduced power or limp mode
- poor acceleration
- cold-start noise from air pump area
- traction and VSC lights illuminated with CEL
How to Fix
Scan for stored air injection codes and verify pump operation, valve movement, and moisture intrusion in the system. Repair usually requires replacing one or both air pumps and/or switching valves, plus related hoses or control components. Some owners use aftermarket bypass modules for off-road or out-of-warranty vehicles, but emissions legality varies by location.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Toyota 17600-0F010 secondary-air pump assembly
pump branch only when command, power, pressure and debris inspection confirm failure Fitment/availability: 2005-2009 Toyota 4Runner 4.7L 2UZ-FE bulletin branch; broader catalog fitment does not justify use without code-directed pump test…
- Genuine Toyota 25710-50022 secondary-air switching/check valve
main switching-valve branch only after the bulletin test identifies valve failure or debris damage Fitment/availability: 2005-2009 Toyota 4Runner 4.7L 2UZ-FE bulletin branch; supersedes 25710-50020 and 25710-50021 Fitment/availability: s…
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Subaru WRX · 2006–2014
Turbo EJ255/EJ257 WRX models equipped with the secondary air injection system commonly develop failures of the air pump, pressure sensor, or the air switching valves. Moisture intrusion and corrosion can cause the valves to stick or the pump to seize, which sets emissions faults and on many cars can reduce power or force a limp-home condition. Owners typically report a check-engine light shortly after cold start, often with rough cold operation or an audible pump noise before failure.
Common Symptoms
- check engine light after cold start
- reduced power or limp mode
- loud buzzing or whining from air pump area
- rough cold start
- failed emissions inspection
How to Fix
Diagnosis usually starts with scanning for secondary air system codes and commanding the pump/valves with a capable scan tool. Repair typically involves replacing one or both air switching valves, the pump, and sometimes the pressure sensor or related hoses; some owners also inspect for water entry and update gaskets/hoses during repair. Because access is tight on turbo models, labor can be significant, and clearing codes without fixing the root cause usually results in repeat faults.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Subaru 14828AA060 Secondary Air Pump Assembly
early pump branch only after bidirectional testing proves the pump itself failed Fitment/availability: 2007 WRX and 2007 STI turbo secondary-air system; also cataloged for 2007-2008 Forester XT, confirm VIN Fitment/availability: Ships di…
- Genuine Subaru 14828AA050 Secondary Air Injection Pump Assembly
later pump branch only after bidirectional testing proves the pump itself failed Fitment/availability: 2008-2014 WRX and 2008-2021 STI; this canonical card uses it only for the 2008-2014 WRX/STI overlap, confirm VIN Fitment/availability:…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipUse an OBD-II scanner that can read Subaru-specific pending/history codes and active test the air pump/valves before buying parts.
Subaru Forester · 2009–2013
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P2444 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2444 mean?
P2444 stands for "Secondary Air Injection System Pump Stuck On (Bank 1)." This powertrain/emissions code means the secondary air injection (AIR) pump for bank 1 appears to be stuck in the 'on' position, continuing to push air when it should be off. The secondary air system briefly pumps fresh air into the exhaust after a cold start to help the catalytic converter heat up and reduce emissions. The computer detected airflow or pressure when none was expected. This is mainly an emissions concern but, if ignored, can affect the air-fuel mixture and over time stress emissions components.
What are the most common causes of P2444?
The most common causes of P2444 are: Faulty secondary air injection pump (running continuously), Stuck-open air switching/check valve, Wiring or relay fault keeping the pump powered, Faulty pump control relay, Connector corrosion or short in the AIR circuit, Faulty engine control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P2444?
Repair costs for P2444 range from $300 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P2444?
Au7o has documented P2444 across 4 vehicle models from 2 manufacturers: Subaru, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.