P2440: Secondary Air Injection System Switching Valve Stuck Open

How serious is P2440?

We rate P2440 as High — address promptly, the top of our three-level scale. That rating comes from the severity recorded in our database for this code, not from how alarming the name sounds.

A high-severity code means the fault can damage expensive components if it is ignored. Continuing to drive is a judgement call that depends on how the vehicle behaves: if it is misfiring badly, losing power, overheating, or flashing the check-engine light, stop driving and have it recovered. A flashing check-engine light specifically indicates an active misfire that can destroy a catalytic converter within a short distance.

What P2440 actually means

P2440 is not on the shared SAE J2012 list: it is a manufacturer-specific code, so its definition comes from the maker’s own service documentation rather than the standard numbering scheme. Our vehicle database stores it against 1 model.

The stored definition for P2440 is “Secondary Air Injection System Switching Valve Stuck Open”. The first character of the code identifies the system — Powertrain in this case. The second character tells you who defined the code: this one is a manufacturer-specific code. Reading the code that way matters: a manufacturer-defined code means the test and its causes are the maker’s own, so the list below is narrower by design and generic code references will not define it.

Within that system, P2440 sits in the the manufacturer's own system grouping group. That is the part of the vehicle the control module was watching when it set the code — the subsystem this code belongs to — and it narrows down enormously where a technician will start looking. Manufacturer-specific codes are worked with the maker’s own service procedure, so the factory test routine matters more than generic advice.

Most likely causes of P2440

Our database records 2 causes for P2440, ranked by how many of the 1 model that log this code report each one.

Air injection pump — recorded on every model that logs this code. switching valve failure — recorded on every model that logs this code.

Causes are listed as recorded in the database. The same code can have different root causes on different vehicles, so the ranking is a starting order for diagnosis rather than a diagnosis in itself.

How a technician diagnoses P2440

Manufacturer codes are worked with the maker’s own service procedure, so the factory test routine matters more than generic advice. Confirm the code is active rather than historic, then work through the ranked causes from cheapest and most likely to most intrusive. In practice that means:

If a workshop replaces a component for P2440 without showing you the measurement that condemned it, ask for the data. On a the manufacturer's own system grouping code, the recorded causes are usually testable, so a diagnosis should be demonstrable rather than asserted.

What drives the cost of fixing P2440

We deliberately do not print a single repair price for P2440. The parts bill depends entirely on which recorded cause is confirmed. The honest answer is that the cost is set by which cause is actually present, and that range is wide — a repair for the first cause listed above and the last can differ by more than an order of magnitude in parts alone: the confirmed cause moves the bill more than any other variable. Add regional labour rates and the spread becomes wider still.

The factors that actually move the number, in rough order of impact:

• Sensor or module. Whether the confirmed cause is a sensor or a control module is the first thing that moves the bill, and on manufacturer-specific systems the pricing is the maker’s own.
• Access. Access varies more on manufacturer-defined systems than on standard ones, because the component placement is not shared across models.
• Dealer-network parts. Some manufacturer-specific components are only available through the dealer network, which removes the aftermarket option from the comparison.
• Diagnosis billed separately. Manufacturer codes are worked with the maker’s own procedure, so the diagnostic step takes the time it takes.

The practical approach: get the cause confirmed first, then collect two or three written quotes for that specific repair. To judge whether the repair is worth doing against the value of the vehicle, use our repair-or-replace decision guide.

Vehicles in our database that log P2440

Only 1 model in our database record P2440, so the list below is short but specific. The makes appearing most often are Toyota (1). Each model links to its own guide, where this code appears alongside that vehicle's full fault list and running costs.

Frequently asked questions about P2440

Related codes and next steps

Codes that share the same system group often appear together, because a single fault can set more than one:

For the full list, see the OBD-II fault code cross-reference. If the repair cost is what you are weighing, model the total with our total cost of ownership calculator before deciding, and check whether an open safety recall covers the fault with the recall lookup.