How does P2442 differ from P2440?

The condition is designated stuck open in both, but P2442 identifies bank 2 and P2440 identifies bank 1. Match that bank to the actual vehicle hardware; do not invent different failure mechanisms from the two numbers.

Is bank 2 on a particular side?

Its location depends on the engine. Use the manufacturer’s diagram and identification instead of assuming a vehicle side or inferring a valve layout.

Does the Toyota update rule out a bad valve?

No. The listed procedure checks whether the calibration is already updated and returns that case to normal diagnosis. The service example does not prove hardware health or make all physical repairs unnecessary.

Do two bank codes make a shared fault more certain?

The pair is a clue to preserve, not a probability or topology verdict. Tests on the actual system must establish whether the reports share a cause.

Can I keep driving with P2442?

The code alone cannot establish safety or an emissions-test result. Follow the handbook, arrange diagnosis and stop safely for overheating, smoke, abnormal exhaust symptoms, severe roughness, unsafe power loss or a flashing warning.

How should the repair be quoted?

Ask which bank-specific result or applicable service branch supports the repair. The quote should itemize investigation, necessary parts or circuit work, any authorized calibration work and final confirmation.

OBD-II trouble code

P2442: Secondary Air Injection System Switching Valve Stuck Open Bank 2

Application matters: P2442 identifies the bank 2 secondary-air switching-valve stuck-open condition. Use the exact engine information to locate the bank and installed hardware. The number does not establish physical side, a separate valve per bank or a shared supply/control arrangement.

The secondary-air monitor recorded a bank 2 switching-valve stuck-open condition. Keep the bank 2 designation when identifying hardware and tests; it does not by itself establish a failed valve or a shared cause.

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

P2442 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 P2442 mean?

P2442 is the bank 2 counterpart to P2440. Retaining the bank number is necessary when selecting the service procedure, interpreting data and locating the affected hardware. It is not a driver-side/passenger-side label or proof of the number of valves installed. The stuck-open designation must be assessed with the actual monitor and tests rather than treated as direct proof of airflow.

For some 2014–2015 Toyota Sequoia and Tundra vehicles with 3UR engines, T-SB-0144-14 describes possible debris or ice in the switching-valve assembly and an ECM logic change. The bulletin also has an important applicability branch: if the calibration is already updated, the technician continues with normal Repair Manual diagnosis. A calibration example neither guarantees that programming will fix every P2442 nor makes a demonstrated valve, control or sensing fault irrelevant.

P2440 alongside P2442 is useful scan information, but it does not prove that both reports have one cause or that two valves failed together. Likewise, P2442 alone does not establish that every other secondary-air path is healthy. Use the vehicle’s required sequence to assess the full code set.

A complaint observed during cold weather may help the investigation. The cited Toyota cause remains a possibility, not evidence that the mechanism will thaw, that drainage is defective or that the present system will test normally. Confirmation must use the conditions and method specified for the actual application.

Possible causes

A switching-valve fault demonstrated on the bank 2 diagnostic path
Debris or ice as a possible contributor in the listed Toyota condition
An actuation, electrical or sensing fault in the installed system
An applicable calibration condition identified through the vehicle service procedure

Symptoms

P2442 recorded with a check-engine warning
Companion bank 1 or other secondary-air faults
An event associated with particular starting or ambient conditions
An unusual noise or running symptom requiring separate assessment
Little noticeable change during a particular 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.Preserve the full code, status and event information together with all other faults. Keep bank 2 distinct from bank 1 when selecting data and component identification.
2.Obtain the exact engine diagram and diagnostic procedure. Do not infer valve count, vacuum actuation or shared wiring from the presence of bank-labelled codes.
3.Record naturally occurring weather and start conditions for the repairer. Avoid owner forced-operation, air-line, hot-exhaust or live electrical tests; a cooled, switched-off visual observation is the limit of a simple inspection.
4.Have a qualified technician verify current service and calibration applicability. Toyota’s cited bulletin sends a vehicle already carrying the updated calibration to normal Repair Manual diagnosis.
5.Follow the prescribed bank 2 and companion-code branches. Use protected actuation, circuit or flow tests only as required, without treating a single code or a pair as a component-health verdict.
6.Confirm the demonstrated repair or applicable service action with the specified monitor conditions. Check remaining faults independently rather than assuming the absence of a light proves the system passed.

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.