P2440 check engine light is on

P2440 CHEVROLETSecondary Air Injection System Switching Valve Stuck Open Bank 1

that code is the secondary air injection valve stuck open bank 1

1. Using a scanner, turn the Key On Engine Off (KOEO).

2. Check for a baro reading from the AIR pressure sensor of about 100 kPa (or 14.7 PSI)

3. Start the engine, turn on the air pump and the AIR control solenoid valve. This will measure the pressure from the air moving through the system into the exhaust. Expect to see 8-10 kPa higher than the KOEO kPa reading (or 1.16 to 1.45 PSI higher than KOEO PSI reading).

4. With the engine running, turn on the air pump, but shut off the AIR control solenoid valve. (This is basically a dead head test of the air pump). Expect to see 15 to 22 kPa above the KOEO baro reading (or 2.18 to 3.20 PSI above the KOEO PSI reading).

That code is related to the Secondary Air Injection System (SAIS) switching valve being stuck open. This valve is located on the passenger side of the engine mid position.

run the fault codes to find why the engine went into limp mode . to reset the light is not the answer as it may be over heating or low oil pressure all of which is bad news for the engine.

Put the OBD P2440 into Google for the answer

P2440 refers to the Secondary Air Injection system. It means that the switching valve is stuck open. We already replaced the secondary air flow pump, now it's telling us that's its the secondary air flow sensor and the valve is stuck open. the code is coming up P2440

P2440 not P02440 !
P2440 Chevrolet Impala Air Injection Check Valve

P2440 Secondary Air Injection System Switching Valve Stuck Open Bank1

Problem is usually the air switching valve that operates the air line coming from air intake to air pump, clean it or replace it.

Here a bulletin.