Toyota 3UR P2440/P2442: secondary-air icing/debris calibration branch. See the manufacturer document, vehicle conditions, exclusions and questions for a qualified shop before assuming a repair.
This is a research summary of a manufacturer communication, not a diagnosis for your car, a DIY repair procedure or confirmation of warranty or recall eligibility. No qualified technician has approved a repair for your individual vehicle here.
This historical communication is conditional. The current revision, VIN/build eligibility, measured diagnosis and any warranty or recall decision are not established here. Ask the manufacturer or a qualified shop to check the complete current document.
Read the Toyota original: 3UR secondary-air switching valve ice/debris · Check open recalls by VIN at NHTSA Source date: 2014-11-07; research checked: 2026-11-01.
What prompted this manufacturer document
- MIL with P2440 and/or P2442
- The bulletin identifies ice/debris as a possible switching-valve factor and describes revised ECM logic intended to reduce recurrence.
Which vehicle conditions must be checked
Each row below retains its own conditions. Do not combine engines, years or models across rows to create new applications. A listed model is not proof that a particular VIN is affected.
- Toyota Sequoia · 2014, 2015 · 3UR family; gasoline
- Toyota Tundra · 2014, 2015 · 3UR family; gasoline
Codes recorded in this document
A root listed only as an appearance has no separately verified meaning here. Preserve every suffix and module name; a shared root does not transfer a repair branch to another vehicle.
| Root | Raw form | Meaning in this source, if established |
|---|---|---|
| P2440 | P2440 | Secondary-air switching valve indicated open, bank 1 |
| P2442 | P2442 | Secondary-air switching valve indicated open, bank 2 |
What an owner can record safely
- Ambient conditions at onset
- Both code and calibration history
- Prior air-injection repairs
Editorial safety boundary for this system
A steady lamp without severe symptoms still needs diagnosis; this is not blanket permission for continued driving.
- Use current model-specific service information, calibrated equipment and a qualified technician for the selected diagnostic branch.
- Do not bypass emissions controls or buy pumps/sensors from a code alone.
This is a conservative editorial policy, not a manufacturer safe-to-drive decision for a specific vehicle.
What the source does not prove
- Do not fit emissions bypass devices or assume this 3UR bulletin covers a 1UR vehicle.
- A code or message alone does not establish a failed part, a safe-to-drive decision or an approved repair for this VIN.
- A service bulletin is not automatically a recall or free warranty repair. Confirm current eligibility directly.
Questions for the repair shop
- Which current manufacturer procedure, VIN/RPO/build gate and test result determine the diagnostic branch?
- Does a later revision or a current recall change the source's original advice?
- What measurement or inspection confirms the cause, and how will the repair be verified?
Read the original record
The linked communication may be revised after the research date. Compare its document number, exact vehicle table, diagnostic preconditions and exclusions with a qualified technician. This page paraphrases selected facts and does not reproduce the manufacturer procedure.
Sources and scope
- Toyota — 3UR secondary-air switching valve ice/debris (T-SB-0144-14) Document: 2014-11-07 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.