P0410 is set when the powertrain control module (PCM) detects that the secondary air injection (AIR) system, which injects fresh air into the exhaust stream during cold start to reduce emissions, is not operating within the expected parameters. The code indicates that the system either failed to activate, failed to achieve the proper flow, or turned off unexpectedly. In most vehicles this system consists of an electric or belt‑driven pump, a check valve, and associated hoses and relays.
The pump may be mechanically seized, have worn bearings, or have internal electrical faults that prevent air flow.
A faulty relay or blown fuse can cut power to the pump, causing the system to remain inactive.
Cracked, disconnected, or clogged hoses can allow air to escape or restrict flow, leading to insufficient system performance.
If the valve that routes air to the exhaust sticks open or closed, the system will not achieve the correct pressure or flow, triggering the code.
Unintended air leaks in the vacuum lines feeding the valve can cause incorrect metering of air and set P0410.
In very few cases the PCM itself may have a software calibration error or internal fault that prevents proper control of the AIR system, but this is an uncommon cause.
Yes, the vehicle will generally still run, but the check engine light will be on and emissions will be higher. The issue should be repaired before a smog test.
In most regions a malfunctioning secondary air injection system causes higher hydrocarbon and carbon‑monoxide emissions, which will result in a failed emissions test.
In the vast majority of cases the problem lies in the AIR pump, relay, hoses, or valve. Replacing the PCM is rarely necessary and should only be considered after all other components have been verified as good.
Continuous operation can indicate a stuck relay or solenoid, which may overheat the pump, cause excessive wear, or trigger additional diagnostic codes. Prompt diagnosis is recommended.