Does P2440 require a new valve?

Not from the code alone. The matched procedure must establish the repair. Toyota’s listed calibration case is useful, but its already-updated branch explicitly returns to normal diagnosis; it does not certify every valve as healthy.

Why did the light appear on a cold morning?

Record that condition for the technician. The Toyota example names debris or ice as a possible cause, but cold timing alone does not prove ice, a drainage problem or that the fault will thaw and clear.

Which side is bank 1?

Use the exact engine information to locate the bank and associated hardware. Do not choose a left, right, driver or passenger side from the code label.

If P2442 is also stored, is there one common fault?

Possibly, but the code pair does not establish that conclusion or the number of affected valves. Preserve both codes and let the vehicle-specific checks determine whether their causes are related.

Can I drive with P2440?

Follow the handbook and actual symptoms; the code alone cannot establish trip safety. Arrange diagnosis and stop safely for severe roughness, unsafe power loss, a flashing warning, smoke, abnormal exhaust symptoms or overheating.

What should an estimate include?

Ask which finding or applicable calibration branch supports the work. Request diagnosis, any required circuit or component repair, authorized programming and confirmation as separate items. The emissions-code label does not predict a price or a local inspection outcome.

OBD-II trouble code

P2440: Secondary Air Injection System Switching Valve Stuck Open Bank 1

Application matters: P2440 identifies the bank 1 secondary-air switching-valve stuck-open condition. Locate the relevant hardware from the exact engine information; the bank designation does not determine a vehicle side, valve count or shared control layout. A recorded stuck-open condition is not a confirmed part diagnosis.

The secondary-air monitor classified a bank 1 switching-valve condition as stuck open. The correct response depends on the installed system, test results and any applicable calibration procedure.

Low severityPowertrainEmissions / Secondary AirAssess symptoms before driving

Quick facts

System: Powertrain
Category: Emissions / Secondary Air
Severity: Low severity
Driving guidance: Depends on symptoms and vehicle guidance
Repair cost range: Get a vehicle-specific estimate after diagnosis.
DIY difficulty: Shop recommended

A code alone cannot establish whether driving is safe. Stop safely for a red brake or oil-pressure warning, overheating, severe misfire, stalling, or impaired braking or steering, and follow the owner's manual. Restraints faults can reduce crash protection even when the vehicle runs normally.

Part of a family with 2 codes

P2440 is one of 2 codes covering secondary air switching valve stuck open bank faults. The identifier must be matched to the exact vehicle. Related codes can share a diagnostic approach, but their circuit, failure condition, and required tests can differ.

P2440 P2442

Read the full guide for this family →

Browse every code in Powertrain, or start from the full code library.

What does P2440 mean?

P2440 reports a switching-valve stuck-open condition associated with bank 1. The description is the monitor’s fault classification, not a direct measurement proving that air is reaching the exhaust or that a particular valve must be replaced. Identify the installed secondary-air hardware and the manufacturer’s bank 1 designation before selecting tests.

Toyota T-SB-0144-14 covers some 2014–2015 Sequoia and Tundra vehicles with 3UR engines. It identifies debris or ice in the switching-valve assembly as a possible cause and describes revised ECM logic. Its procedure checks calibration applicability: when the calibration is already updated, page 6 returns the technician to normal Repair Manual diagnosis. An eligible calibration update does not certify the pump, valve or wiring as healthy.

Record whether the bank 2 counterpart P2442 or other secondary-air codes are also present. That information can guide the prescribed diagnostic path, but it does not prove that there are two separate failed valves or one shared cause. The actual plumbing and controls must come from vehicle information, not a bank-pattern probability rule.

Weather history can be useful evidence, especially for the listed Toyota case, but a cold occurrence does not establish icing, a drainage fault or later recovery. Leave confirmation, protected actuation and any electrical or flow checks to the applicable workshop procedure.

Possible causes

A sticking or leaking switching-valve condition established by the matched tests
Debris or ice as a possible cause on the listed Toyota applications
A fault in the installed actuation, circuit or sensing path
A calibration condition covered by an applicable manufacturer procedure

Symptoms

Check-engine warning and P2440 stored
Other secondary-air or bank 2 codes recorded with the event
A fault noticed after a start or under particular weather conditions
An unusual noise or running complaint that needs its own assessment
No obvious driving complaint during an inspection

Diagnostic steps

Save the full scan report, code status, and available freeze-frame data before clearing anything. Confirm the reporting module, any failure-type suffix, and the procedure for the exact vehicle. The steps below are an overview; use manufacturer specifications and safety procedures for testing.

1.Save the full P2440 designation, code status and event data with companion faults, including P2442 if present. Do not assign a shared cause from the bank pattern.
2.Identify the bank 1 hardware and obtain the matched procedure. Record weather and starting conditions as history without deliberately reproducing the fault.
3.Limit owner inspection to safely accessible visual observations with the engine switched off and cooled. Do not touch hot exhaust parts, disconnect air lines or force the secondary-air system to operate.
4.Have a qualified technician check current calibration and bulletin applicability. On the cited Toyota procedure, an already-updated calibration returns to normal Repair Manual diagnosis.
5.Follow the indicated actuation, circuit, feedback and flow checks under the actual service instructions. Do not assume an update eliminates the need to assess a physical defect, or that a stored stuck-open code proves measured airflow.
6.Repair the demonstrated fault or perform the applicable service action and complete its specified confirmation. Reassess remaining codes rather than treating a cleared warning light as proof of repair.

Repair cost

Get a vehicle-specific estimate after diagnosis.

A trouble code alone does not price the repair. Ask the shop to identify the confirmed fault and itemize diagnosis, parts, labor, programming or calibration, and taxes.

Estimate your repair

Run the numbers for your vehicle

Open the Repair Cost Estimator with control module programming, where a calibration applies preselected. Adjust labor rate and vehicle category to fit your situation.

Estimate your repair cost

Related repairs

These links are planning examples; the code does not confirm that any listed part has failed.

Control module programming, where a calibration applies Secondary air injection pump replacement, if diagnosed Check engine light diagnosis

DIY vs shop

A qualified shop is recommended because this can involve vehicle-specific emissions-system diagnosis and protected circuit or component tests, with pressure relief, exhaust cooling, fluid handling or setup when required by the installed system and confirmed repair. Ask the technician what testing confirmed the repair.