P0410
Secondary Air Injection System MalfunctionP0410 is a generic OBD-II powertrain diagnostic trouble code: Secondary Air Injection System Malfunction. It is logged by the engine control unit when the egr monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0410 means
DTC P0410 is an SAE generic powertrain code that indicates a malfunction in the Secondary Air Injection (SAI) system. This system is designed to inject fresh atmospheric air directly into the exhaust stream during cold engine starts, raising exhaust temperatures more quickly and oxidising unburned hydrocarbons and carbon monoxide before they leave the tailpipe. The ECM monitors the downstream oxygen sensor voltage during this operation; under normal function, the O2 sensor voltage should drop to approximately 125 mV within 5–10 seconds of a cold start as the injected air leans out the exhaust mixture.
When the ECM does not detect the expected lean shift in O2 sensor output during a cold-start SAI activation cycle, it sets P0410 and illuminates the MIL. The fault can originate anywhere in the SAI circuit: a seized or moisture-damaged air pump, a failed relay or solenoid, cracked or collapsed hoses, or carbon-clogged check valves that prevent air from reaching the exhaust ports. On many GM platforms in particular, water ingress into the pump housing is a well-known failure mode that causes the pump to seize.
Although the vehicle will typically continue to operate normally with P0410 set, the increased cold-start emissions will cause a failure on an OBD-II emissions test. The code should be diagnosed and repaired promptly to restore emissions compliance, even if no drivability symptoms are present.
Common causes
Most-frequently reported root causes when P0410 is logged.
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1
Failed or seized secondary air injection pump
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2
Faulty air injection pump relay
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3
Defective air injection control solenoid
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4
Failed or carbon-clogged one-way check valve(s)
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5
Cracked, collapsed, or disconnected air injection hoses or ducting
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6
Blown air injection system fuse
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7
Open or shorted wiring / poor electrical connections in the SAI circuit
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8
Carbon buildup blocking airflow to exhaust ports
Symptoms drivers notice
How to diagnose P0410
A typical diagnostic flow when this code is present.
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1
Scan for all stored DTCs and freeze frame data; confirm P0410 is present and note cold-start conditions at time of set
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2
Check the air injection fuse(s) in the fuse box; replace any blown fuse and retest before continuing
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3
Test the air injection pump relay: swap with an identical relay or apply direct battery voltage to the pump to verify pump operation
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4
Inspect all SAI hoses and ducting for cracks, collapses, or disconnections; repair or replace as needed
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5
Test the one-way check valve(s): remove and blow through each — air should pass freely in one direction only; replace any valve that is stuck open, stuck closed, or carbon-fouled
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6
With a cold engine (minimum 10–12 hours soak), monitor O2 sensor voltage live data during the first 10 seconds after start; voltage should drop below 125 mV confirming air is reaching the exhaust — if not, suspect a blocked passage or pump failure
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7
Inspect pump wiring harness and connector for corrosion, chafed insulation, or moisture intrusion; repair as necessary before condemning the pump itself
Related powertrain codes
- P0400 — Exhaust Gas Recirculation Flow Malfunction
- P0401 — Exhaust Gas Recirculation Flow Insufficient Detected
- P0402 — Exhaust Gas Recirculation Flow Excessive Detected
- P0403 — Exhaust Gas Recirculation Circuit Malfunction
- P0404 — Exhaust Gas Recirculation Circuit Range/Performance
- P0405 — Exhaust Gas Recirculation Sensor A Circuit Low
Frequently asked questions
Can I drive with a P0410 code?
Yes, the vehicle will typically run normally. However, increased cold-start emissions mean it will likely fail an OBD-II smog or emissions test, and the root cause should be addressed within a reasonable timeframe.
Is P0410 the same as a bad air pump?
Not necessarily. While a failed air pump is a common cause, P0410 can also be set by a blown fuse, a faulty relay, a failed solenoid, defective check valves, or damaged hoses — all of which are cheaper to fix. Always diagnose the full circuit before replacing the pump.
Why does moisture damage the secondary air pump?
The pump draws fresh air and forces it into the hot exhaust system. When the engine shuts off, hot exhaust gases can backflow through the check valves if they fail, introducing condensation into the pump housing. Over time this causes corrosion and pump seizure, a well-documented failure pattern on GM (Chevrolet, GMC, Cadillac) vehicles.
Will clearing the code fix P0410?
Clearing the code only resets the MIL; it will return after the next cold-start drive cycle if the underlying fault is not repaired. The ECM requires a completed SAI monitor test with a satisfactory O2 sensor response to close the code permanently.
Disabling P0410 in software
RaceTune can permanently disable P0410 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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