P2445: Secondary air pump not running when commanded (bank 1)

Secondary air injection system pump stuck off, bank 1

Severity: Monitor

Rick's Free Auto Repair Advice says the code will not stop you driving but marks an emissions fault that should be fixed.

It gets more serious if:

Inspect soon: Have it checked soon if the engine hesitates or stumbles on acceleration, which PartsAvatar lists as a symptom.

Source: how we rate severity

P2445 in short

P2445 means the secondary air injection system is not delivering air on bank 1 when the computer commands it. Leaking vacuum lines are the most common cause on Toyotas, followed by a failed air pump or pressure sensor. The car usually drives normally, but the emissions fault should be fixed.

After a cold start the secondary air system pushes fresh air into the exhaust to help the catalyst heat up and burn leftover fuel.

A pressure sensor in the air switching valve checks that this is working. On the Toyota Tacoma, the code sets when it reads under about 2.5 kPa while the computer is commanding secondary air.

So low pressure can come from a leak, a pump that is dead or seized, a blown fuse or relay, or a faulty sensor.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

Cause 1: Broken, cracked or leaking vacuum line
Common general cause
Why it ranks here
Rick's ranks leaking vacuum lines first on the Tacoma; PartsAvatar lists the vacuum hose too.
What would change this
Rises if a hose is cracked or off. Falls if all lines are intact.
How to test the vacuum hoses and intake leaks
Cause 2: Failed secondary air pump, fuse or wiring
Common general cause
Why it ranks here
Both sources list the pump assembly, its fuse and harness.
What would change this
Rises if the pump gets no voltage or gets voltage and does not run. Falls if the pump runs when powered.
How to test the secondary air pump
Cause 3: Air switching valve or its pressure sensor
Possible — needs testing
Why it ranks here
Rick's ranks the pressure sensor third; PartsAvatar lists the switching valve and sensor.
What would change this
Rises if the pump runs and lines are sound but the sensor reading does not change. Falls if the sensor reading moves with the pump.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

Step 1: Read all codes and freeze-frame data, then check the air pump fuse.
Low riskTool: scan tool
- IfThe fuse is blown
  It meansReplace it and see if the code returns, and look for why it blew.
  Points to: Failed secondary air pump, fuse or wiring
- IfThe fuse is fine
  It meansCheck the vacuum lines.
  Go to step 2
Step 2: Inspect all vacuum lines at the secondary air system for cracks, splits or loose ends.
Low risk
- IfA damaged line is found
  It meansRepair it and retest.
  Points to: Broken, cracked or leaking vacuum line
- IfLines look good
  It meansHave the pump and sensor tested.
  Go to step 3
Step 3: Have a shop check for battery voltage at the air pump after a cold start and compare the pressure sensor signal with the pump on and off.
Best left to a shopTool: multimeter
Warning:Cold-start tests are done near moving belts and a hot exhaust. Let a shop do it.
- IfNo voltage reaches the pump
  It meansLook for a wiring, relay or control fault.
  Points to: Failed secondary air pump, fuse or wiring
- IfVoltage is present and the pump does not run
  It meansThe pump has failed.
  Points to: Failed secondary air pump, fuse or wiring
- IfPump runs but sensor does not respond
  It meansThe sensor is suspect.
  Points to: Air switching valve or its pressure sensor

Symptoms

Check engine light
Noise from the air pump
Hesitation on acceleration Gets more serious: stop and have it checked.

How to fix

Step 1: With the engine off and cool, check the secondary air pump fuse and look over visible vacuum lines for cracks.

On your vehicle

Lexus

2010–2013 · GX
Supported by vehicle data
Lexus bulletin L-SB-0028-14 names P2445. Some GX 460 with the 1UR-FE engine set P2445 with other secondary air codes. The summary says the air pump filter and air switching valve were modified to make this less likely. Whether it is still current is not verified.

L-SB-0028-14Status unverified
Secondary air pump filter and air switching valve revised (GX 460)
2010–2013gx · issued April 2, 2018 · NHTSA 10132729
Some GX 460 with the 1UR-FE engine set P2445 with other secondary air codes. The summary says the air pump filter and air switching valve were modified to make this less likely.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Toyota

2012–2013 · Sequoia
Supported by vehicle data
Toyota bulletin T-SB-0024-13 names P2445 (also listed for tundra). Some 2012-2013 Sequoia and Tundra with the 3UR-FBE engine set P0418 and/or P2445. The summary says the engine computer logic was modified. Whether it is still current is not verified.
2005–2009 · Sequoia
Supported by vehicle data
Toyota bulletin T-SB-0230-12 Rev names P2445 (also listed for 4runner, land-cruiser, tundra). Some 4Runner, Land Cruiser, Sequoia and Tundra with the 4.7 L 2UZ-FE engine set a group of secondary air injection codes that includes P2445. Only the summary was read, so the repair is not stated here. Whether it is still current is not verified.

T-SB-0024-13Status unverified
ECM logic change for P0418 and/or P2445 (Sequoia, Tundra)
2012–2013sequoia, tundra · issued April 23, 2018 · NHTSA 10133831
Some 2012-2013 Sequoia and Tundra with the 3UR-FBE engine set P0418 and/or P2445. The summary says the engine computer logic was modified.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
T-SB-0230-12 RevStatus unverified
Secondary air injection codes including P2445 (2UZ-FE engine)
2005–2009sequoia, 4runner, land-cruiser, tundra · issued April 2, 2018 · NHTSA 10132097
Some 4Runner, Land Cruiser, Sequoia and Tundra with the 4.7 L 2UZ-FE engine set a group of secondary air injection codes that includes P2445. Only the summary was read, so the repair is not stated here.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P2445 yet.

All Secondary air injection codes

P2445 questions

Can I disable or remove the air pump?

PartsAvatar warns the car is not intended to run without it, and removing parts can cause other problems.

Sources and review

Toyota Tacoma P2445 explained — Rick's Free Auto Repair Advice
P2445 OBD error code summary — PartsAvatar
Lexus L-SB-0028-14: Secondary air pump filter and air switching valve revised (GX 460) — Manufacturer service bulletin via NHTSA manufacturer communications flat file
Toyota T-SB-0024-13: ECM logic change for P0418 and/or P2445 (Sequoia, Tundra) — Manufacturer service bulletin via NHTSA manufacturer communications flat file
Toyota T-SB-0230-12 Rev: Secondary air injection codes including P2445 (2UZ-FE engine) — Manufacturer service bulletin via NHTSA manufacturer communications flat file

Last reviewed: October 15, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

Severity: Monitor

Most likely causes

Cause 1: Broken, cracked or leaking vacuum line

Cause 2: Failed secondary air pump, fuse or wiring

Cause 3: Air switching valve or its pressure sensor

What to test first

Step 1: Read all codes and freeze-frame data, then check the air pump fuse.

Step 2: Inspect all vacuum lines at the secondary air system for cracks, splits or loose ends.

Step 3: Have a shop check for battery voltage at the air pump after a cold start and compare the pressure sensor signal with the pump on and off.