P2447: How to Diagnose & Fix — Secondary Air Injection System Pump Stuck Off (Bank 2)
2 vehicles · 1 makes · $1,200-$4,000 repair
How to diagnose and fix P2447: 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 Tundra · 2005–2013
The secondary air injection pump is prone to failure due to water intrusion. The electric motor is located in the wheel well with moisture exposure, and the rubber boot covering the motor traps water, causing the pump to short circuit. This triggers check engine lights with codes P2440, P2443, P2445, P2447, P0418, or P0419. Some vehicles may enter limp mode.
Common Symptoms
- Check engine light illumination
- Jet engine noise on cold startup
- Decreased fuel economy
- Limp mode activation
- Rough idle when cold
How to Fix
Toyota extended warranty coverage on the air injection pumps and air switching valves for 2007-2010 models, and Warranty Enhancement Program ZG6 covers moisture-related air injection pump/switching valve failures on certain 2011 Tundras. Repair costs range from $2,000-$4,000 for OEM replacement. Some owners opt for aftermarket bypass kits with block-off plates.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17610-0S010 genuine secondary-air pump assembly
replace the corresponding pump only when active testing and the applicable Toyota program identify it as failed Fitment/availability: Cataloged for selected 2007-2013 Tundra applications; exact engine, side/quantity, DTC branch, VIN and …
- Toyota 17610-0S030 genuine secondary-air pump assembly
replace the program-matched pump after active-test confirmation, with all required valves, inlets, gaskets and calibration handled separately Fitment/availability: Cataloged for selected 2012-2021 4.6L/5.7L applications; on this card use…
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Owner tips & cautions
- TipDIY repairs can save significantly - dealer charges $2,000-$4,000 but DIY costs are typically 50-70% less
- TipConsider OEM parts for critical components like sensors and electrical parts - aftermarket can be unreliable
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
Sources for this issue (2)
Toyota Tacoma · 2012–2015
Tacomas with the 1GR-FE 4.0L V6 are known for failures of the secondary air injection system, including the air pump and switching valves. Moisture intrusion and valve sticking can trigger check-engine lights and force the truck into reduced-power or limp mode. Owners frequently report sudden loss of acceleration along with expensive dealer repair estimates, because Toyota's fix replaces the air pump and both switching valves together.
Common Symptoms
- check engine light
- TRAC/VSC lights on
- reduced power or limp mode
- poor acceleration
- cold-start abnormal pump noise
How to Fix
Diagnose with a scan tool and active tests to determine whether the pump, bank valves, or control circuits have failed. Repair usually involves replacing the failed air pump and/or switching valves, checking related vacuum/electrical connections, and clearing codes after verification. Some owners install bypass modules, but emissions-compliant repair with quality parts is the proper fix.
What you need to diagnose it
The repair instructions explicitly call for reading stored codes. Use a scanner that can read the named code families before choosing a repair.The recommended scanner supports these code families; confirm your exact year, model and module coverage before buying.
ANCEL AD310 Classic OBD-II Scanner
Read & clear engine (P) codes
$20–$40View
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Reading and clearing the code is DIY work. Module replacement or reprogramming is not — most modules are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 17610-0W020 genuine secondary-air pump assembly
replace the pump only when Toyota's active-test and DTC/inspection branch requires pump replacement Fitment/availability: Toyota's T-SB-0333-17 repair part for the VIN-specific 2012 Tacoma 4.0L 1GR-FE Mexico-production branch; confirm VI…
- Toyota 25710-31022 genuine secondary-air switching-valve assembly
replace a moisture-damaged or stuck switching-valve assembly as part of the Toyota-prescribed repair set Fitment/availability: Superseding switching-valve assembly specified by T-SB-0333-17 for the affected 2012 Tacoma 1GR-FE Mexico-prod…
- Toyota 17613-0P010 genuine air-pump protective cover
reduce repeat filter damage after the confirmed secondary-air-system repair Fitment/availability: Toyota T-SB-0333-17 and CSP ZHA cover for the affected 2012 Tacoma 1GR-FE repair; confirm VIN and use with the complete prescribed pump/val…
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
- TipIf the truck enters limp mode with P2440-series codes, diagnose the air injection system before replacing unrelated sensors.
- TipAddress water intrusion and inspect hoses/connectors during repair, since moisture is a common contributor to repeat failures.
Sources for this issue (5)
- Toyota T-SB-0333-17: Air Injection System - Moisture Intrusion: MIL ON DTC P2440/P2442 (2012 Tacoma 1GR-FE)tsb
- Toyota T-SB-0333-17 Rev1: Secondary Air Injection System (2012 Tacoma 1GR-FE)tsb
- TacomaWorld - secondary air injection pump on 2012-2015 Tacomasforum
- TacomaWorld - SAI valve/pump failure, limp mode and dealer quoteforum
- CarComplaints - 2012 Toyota Tacoma P2440/P2442 air injection complaintsforum
Find P2447 by make
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P2447 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 P2447 mean?
P2447 stands for "Secondary Air Injection System Pump Stuck Off (Bank 2)." This code means the engine computer detected that the secondary air injection (SAI) pump for Bank 2 appears stuck off - it is not delivering the expected airflow when commanded on. The SAI system injects fresh air into the exhaust during cold starts to reduce emissions until the catalytic converter warms up. If the pump isn't producing flow, cold-start emissions rise and the system fails its self-test. This is primarily an emissions issue rather than a driving hazard, but it will keep the check engine light on and can cause inspection failures.
What are the most common causes of P2447?
The most common causes of P2447 are: Failed or seized secondary air injection pump, Blown fuse or faulty relay for the air pump, Wiring or connector fault to the pump, Stuck-closed air switching/check valve, Clogged or disconnected air injection hose, Water or debris damage to the pump. The specific cause varies by vehicle.
How much does it cost to fix P2447?
Repair costs for P2447 range from $1,200 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P2447?
Au7o has documented P2447 across 2 vehicle models from 1 manufacturers: Toyota.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.