I have a 2006 pontiac grand prix with the check engine code po2440, secondary air injection valve stuck open. I have replaced the value twice, replaced the air pressure sensor, the air pump, a relay to the air pump, and a relay to the air valve. It has been a problem for me since Feb. and I still can't fix it. I took it to a mechanic/electrician and we still can't solve the problem. Any advice would help.
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What engine ? 3.8 or 5.3 L
DTC P0128: Engine Coolant Temperature (ECT) Below Thermostat Regulations Temperature
DTC P0411 : Secondary Air Injection (AIR) System Incorrect Air Flow Detected
DTC P2440 : Secondary Air Injection (AIR) Valve Stuck Open
DTC P2431 : Secondary Air Injection (AIR) System Pressure Sensor Performance
Circuit/System Description
The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The system forces fresh filtered air into the exhaust stream in order to accelerate the catalyst operation. An electric air pump, the secondary AIR injection pump, provides filtered air on demand to the AIR control solenoid valve/pressure sensor assembly. The AIR control solenoid valve/pressure sensor assembly controls the flow of air from the AIR pump to the exhaust manifold. The AIR solenoid valve relay supplies the current needed to operate the AIR solenoid valve/pressure sensor assembly. A pressure sensor is used to monitor the air flow from the AIR pump. The powertrain control module (PCM) supplies the internal pressure sensor with a 5-volt reference, an electrical ground, and a signal circuit.
The AIR diagnostic uses 3 phases to test the AIR system:
DTCs P0411 and P2430 run during Phase 1
DTCs P2430 and P2440 run during Phase 2
DTC P2444 runs during Phase 3
During phase 1, both the AIR pump and the solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 8-10 kPa above BARO.
During phase 2, only the AIR pump is activated. The solenoid valve is closed. Pressure sensor performance and solenoid valve deactivation are tested. Expected system pressure is 15-20 kPa above BARO.
During phase 3, neither the AIR pump nor the solenoid valve is activated. AIR pump deactivation is tested. Expected system pressure equals BARO.
In all 3 phases, testing is accomplished by comparing the measured pressure against the expected pressure. The PCM can detect faults in the AIR pump, AIR solenoid valve/pressure sensor assembly, and the exhaust check valve. The pressure sensor can also detect leaks and restrictions in the secondary AIR system plumbing.
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
P2430 Secondary Air Injection System Air Flow/Pressure Sensor Circuit, The AIR diagnostic uses 3 phases to test the AIR system:
DTCs P0411 and P2430 run during Phase 1 DTCs P2430 and P2440 run during Phase 2 DTC P2444 runs during Phase 3 During phase 2, only the AIR pump is activated. The solenoid valve is closed, this is p2430 and p2440. -The AIR system pressure sensor is stuck. good-day !!
Secondary Air Injection System Incorrect Flow Detected, what does this mean? you need to replace the secondary air injection check valve, when u buy the part from the local GM dealer ask him or her to give u a print out of the location from the parts diagram reference book, they almost always will, the part is about $100
Although this particular code is not generic for many years because the system the code deals with is on a limited range of grand prix, I looked at info for a 2005 grand prix 3.8 liter. P0411 Secondary air injection incorrect air flow detected. Deals with The air injection pump, hoses, and switching valve(s) could all be at fault. Water and impact damage to the pump is common, as is stuck switching valve. Hoses can break or come off. The pump itself you should hear run shortly after starting the car(most times). It sounds like a very high pitch vacuum cleaner. There are a range of specific diagnostic test dealing with this particular code.
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