Just bought a 2005 Grand Prix. Dealing with p0411 code = secondary air flow inc

**Jlaws** · 07-15-2009

What's up. Just picked up a 2005, with a 3.8. My former cars were Cadillac STS, Lexus LS430 and Audi A6 4.2 so I am used to luxury V8s. Suprisingly the 3.8 V6 has pretty good power! I got the car with 84K miles on it for $5800. It's stealth gray with a few keyed areas. Other than that it's in excellent shape and seems like the deal of the century. I've been roughing in a 1996 grand am for 8 months. Just recently bought a home so I am on a tight budget till I get settled. I love the car so far. Very solid, good size and looks good.

The check engine light popped on, I scanned it and got a P0411 code which seems pretty common for these cars. I plan on cleaning out the Air injection pump but I don't know where it is located. Any help would be appreciated. The search function did not yield anything. Is it some where in the back of the engine?

Plan to keep this car for a long time and drive it to the ground. I love my 3.1 Grand Am which I've owed for 5 yrs. It has 160K miles on it and has been very well behaved. I hope the Grand Grix can be just as reliable !

**MizzBecca** · 07-15-2009

welcome =)

**jmscp32** · 11-13-2016

Hello, i have the same probe with my 2005, i am wondering if you ever got the answer to your question?

**markpa** · 11-13-2016

The air pump is under the air filter box. I think there was a TSB on some of the early models that did not draw air from the air box and would get water in and ruin the pump. My 08 had that code and had a bad check valve on the back of the engine.

Sent from my iPhone using Tapatalk

**Bugsi** · 11-26-2016

If it's like my 2001, it's in the driver's side front fender well, under the air cleaner. Here's a diagram:

The intake apparently sucks in water, which pools inside the rubber cover of the pump's motor, eventually corroding out the motor.
The solution is to remove the pump and replace it with a new one, but drill a 1/4" hole in the middle of the rubber cover, so any ingested water will drain harmlessly out. Also, reroute the intake so it sticks UP instead of DOWN. After replacing mine, it looks like this:

While I was in there, I also replaced the relay to the pump, and for good measure, I replaced the Check Valve, which plumbs into the exhaust manifold in the back of the engine, centered right in front of the firewall. Mine had also *melted* the 30-amp fuse in the under-hood fuse box, so I replaced the entire fuse box with one sourced from a salvage yard.

Here's the steps to replace the pump:
Raise the vehicle.
Remove driver's side front wheel.
Remove the fasteners from the front portion of the left front wheel well/splash shield.
Reposition the splash shield to gain access to the pump and bracket assembly.
Reposition the sound insulator to gain access to the pump and bracket assembly.
Disconnect the pump electrical connector.
Remove the pump/bracket assembly fasteners.
Reposition the pump and bracket assembly to gain access to the outlet hose.
Remove the outlet hose from the pump.
Remove the pump and bracket assembly from the vehicle.

Because emissions controls that are part of the exhaust can affect one another, I'd also recommend pulling off your EGR valve and cleaning the pintle and make sure you can push it in, and that it springs back out. Also, for good measure, check your PCV valve to see if it's clogged or in my case, it was *missing*.

I don't know if the check valve can be tested or not, but since I'd replaced the secondary AIR pump, its relay, and the fuse box, I decided it was easier to replace the one remaining component in that system than to risk trusting it.

Thread: Just bought a 2005 Grand Prix. Dealing with p0411 code = secondary air flow inc

Thread Tools

Display

Similar Threads

My New 2005 Grand Prix

pontiac grang prix P0411 Secondary Air Injection System Incorrect Flow Detected

JUst bought my grand prix

HELP FAST! 2005 Grand Prix

Bookmarks