P2440 on SUBARU IMPREZA — AIR System Switching Valve Stuck Open Bank 1

Q: "What does P2440 mean on a SUBARU IMPREZA?"

"P2440 indicates: AIR System Switching Valve Stuck Open Bank 1. This is a powertrain code. 2 SUBARU IMPREZA owners have reported this to NHTSA."

Q: "What are the most common causes of P2440 on SUBARU IMPREZA?"

"Based on 2 NHTSA reports, the most commonly cited components are: Engine And Engine Cooling,Fuel System, Gasoline, Unknown Or Other. These percentages are based on the component field in owner complaints."

Q: "Is P2440 serious on my SUBARU IMPREZA?"

"Of 2 NHTSA reports for this code on SUBARU IMPREZA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my SUBARU IMPREZA shows P2440?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P2440 Means on Your SUBARU IMPREZA

P2440 is a diagnostic trouble code indicating: AIR System Switching Valve Stuck Open Bank 1. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 SUBARU IMPREZA owners have reported this issue to NHTSA across model years 2006-2013. Most reports come from the 2006, 2013 model years. The most commonly reported component is Engine And Engine Cooling,Fuel System, Gasoline (50.0% of reports).

Real SUBARU IMPREZA Owner Reports

Source: NHTSA Complaints Database

"Code p1410 secondary air injection system switching valve stuck open. this is a common error many 2006 and up subaru impreza wrx owners are having. the emissions system is prone to fail due to carbon buildup or moisture and rust contaminating valves, leading to repairs costing $700 to $1500."

— 2006 SUBARU IMPREZA owner · ENGINE AND ENGINE COOLING,FUEL SYSTEM, GASOLINE · Filed 04/01/2011

"Got 2 codes on secondary air system p2440,p0410. Witch restricted me from passing safety inspection and have a check engine light. It seems to be an on going common problem."

— 2013 SUBARU IMPREZA owner · UNKNOWN OR OTHER · Filed 12/21/2021

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'06

1

'13

Common Causes on SUBARU IMPREZA

Based on NHTSA complaint component analysis for this vehicle.

ENGINE and ENGINE COOLING,FUEL SYSTEM, GASOLINE 50%

UNKNOWN or OTHER 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P2440 mean on a SUBARU IMPREZA? ▾

P2440 indicates: AIR System Switching Valve Stuck Open Bank 1. This is a powertrain code. 2 SUBARU IMPREZA owners have reported this to NHTSA.

What are the most common causes of P2440 on SUBARU IMPREZA? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Engine And Engine Cooling,Fuel System, Gasoline, Unknown Or Other. These percentages are based on the component field in owner complaints.

Is P2440 serious on my SUBARU IMPREZA? ▾

Of 2 NHTSA reports for this code on SUBARU IMPREZA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my SUBARU IMPREZA shows P2440? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.

P2440 on Other Vehicles

→ All codes reported on SUBARU IMPREZA