The OBD2 error P0410 code is related to your air injection system. Part of the exhaust system, this allows more air to be mixed into the exhaust, thereby lowering harmful emissions.
As trouble codes go, P0410 is very mild. Not only does it present little risk of engine damage, it’s also relatively easy to diagnose. A damaged air pump caused by worn check valves is the problem in the vast majority of cases. Having said that, it’s still important to carry out a full diagnosis—in some cases, it can be a faulty oxygen sensor or blocked air passage.
If your vehicle is still under warranty, repairs of the P0410 trouble code are typically covered under the emissions warranty. This includes replacing the air pump, check valve, inlet hose, and pump fuse. Check to see if your warranty is still good before you start in on a DIY diagnosis.
P0410 Code Definition
P0410 Code Definition (Generic): Secondary Air Injection System Malfunction
P0410 Cadillac Code Definition: AIR System
P0410 Mercedes Code Definition: Secondary Air Injection
P0410 Saturn Code Definition: AIR System
P0410 Trailblazer Code Definition: AIR System
What Does P0410 Mean?
There are two oxygen sensors in your exhaust system. Their job is to track the ratio of air to fuel in the exhaust and send this information to the engine control module (ECM) or powertrain control module (PCM). It in turn adjusts the mix to maintain ideal engine performance.
Each oxygen sensor has a specified voltage range it should operate within. A lean mixture, or one with too much air, will give a lower voltage. High voltage readings indicate too much fuel, or a rich mixture. As the ECM or PCM adjusts the air to fuel ratio, the voltage of the sensors should change accordingly.
The air pump is another part of the exhaust system. It pulls air from outside the car and pumps it into the exhaust bank. This reduces the quantity of harmful emissions in the exhaust, reducing the amount that escape into the atmosphere.
When the air injection system is active, the reading from the oxygen sensors should drop. If it doesn’t, the engine computer triggers the P0410 trouble code.
P0410 is just one of many codes related to the secondary air injection system. Others include P0411-P0419, P0491, and P0492. You may see one or more of these codes in conjunction with P0410.
This is a generic powertrain code, so it applies to all OBD2 compliant vehicles. The specific fix can vary depending on the manufacturer, however. Make sure to check for technical service bulletins (TSB) related to this code before you begin the diagnosis below.
GM vehicles specifically are known to have a P0410 issue. The TSB in this instance suggests replacing the secondary injection hose, which is not a common fix in the general diagnosis. Starting with vehicle-specific repairs can save you a lot of wasted effort and frustration.
What Are The Symptoms Of The P0410 Code?
In some cases, you won’t notice any symptoms except the check engine light with P0410. The most common symptoms include:
- Activation of the check engine light
- Noisy air injection system pump
- Engine hesitation when accelerating
What Are The Causes Of P0410?
- Worn or faulty check valves (most common)
- Faulty air pump or air pump relay
- Blown fuse in air pump
- Blocks in air injection system
How Serious Is The P0410 Code?
The P0410 code is of low severity. Any symptoms you notice will be slight, and there’s little risk of long-term damage. This code will cause you to fail an emissions test, however, so you should repair it before your next one.
How To Diagnose And Fix The P0410 Code
Tools you’ll need:
- Use an OBD2 scan tool to check for other codes. Fix any codes related to the oxygen sensors before continuing with your P0410 diagnosis. If you see other air injection system codes, these can help you pinpoint the issue. Also read the freeze frame data to verify the conditions when the code was set. Clear the codes and test drive your vehicle to see if P0410 returns.
- Visually inspect the air pump and vent solenoid for moisture and signs of corrosion. In most cases, this code triggers after water seeps into the pump through a worn one-way check valve. If this water freezes the pump can’t turn and the circuit overloads. This is especially common in more humid climates. If this has happened, replace the air pump and the check valve.
- Isolate the oxygen sensor readings with your OBD2 scanner. Activate the air injection pump and watch the readings. The voltage should drop below 150 millivolts within two seconds of the pump activating. Verify that the pump is turning on. If it is, replace the oxygen sensor.
- Clean out the hoses around the air pump to remove any blockages.
- Check the resistance of the power and ground to the air injection pump using a digital multimeter.
Common Mistakes To Avoid While Diagnosing The P0410 Code
Don’t just replace the air pump and assume you’ve fixed the problems. If the check valves are worn, your new pump will suffer the same fate as the last, even if the code clears in the short-term. Make sure you conduct a complete diagnosis before replacing any components.
Tips To Avoid P0410 In The Future
The most common cause of the P0410 trouble code is excess moisture in the air pump. Some moisture is a natural component of exhaust, but too much can seriously damage electronic components, even in climates where it’s not likely to freeze.
If you’ve had a P0410 trouble code, it’s a good idea to replace the check valve if you noticed any signs of corrosion or moisture on the air pump. This is the best way to prevent the code from recurring.
Some vehicles have continuing problems with the air pump fuse blowing, even after replacing the check valves. In this case, you may want to poke a small hole into the pump cover. This will let any excess moisture drain out rather than accumulating around the pump.