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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
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.
I had this same problem. You need to either rebuild or replace the valve assy. it is not hard to do and the parts are available from crossman for about $14 I think that the valve assy costs about $24 the parts list is on crossmans web page
Some air gun problems are an easy fix, some require extensive presses and jigs to move springs around. Most are not to messed with. I know, I have tried my best to repair an air rifle or two and had to send them back to the company to get them fixed. And there is nothing I can't fix, I have a big machine shop, been gun smithing for years and couldn't fix a little air rifle. Check out this website, it might help you, or steer you in the right direction. ,,,,,,,http://www.airguns.net/faq.php#faq1
REMOVE THE FOREARM PUMP ASSY SEE IF THE CUP IS WORN OR SHRUNK
PUT SOME LIGHT OIL ON THE CUP AND SPREAD
IT OPEN AND FLEX IT SOME SO THAT IT SPREADS OUT TIGHTER IN THE TUBE
YOU CAN ORDER PARTS FROM CROSSMAN