Yes, there is a TSB on that code.  I know the listed vehicles aren't
your specific one, but it might lead you in the right direction to fix
the problem.  I hope for your sake you don't have to go through this,
as it is a very expensive repair if your vehicle is not in warranty,
you're looking at several hundred dollars in parts alone.  Good luck.

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Vehicle: Customer Interest Emissions - MIL ON/DTC P0410 (AIR System)
Set

Bulletin No.: 04-06-04-037

Date: May 27, 2004

TECHNICAL

Subject: Check Engine Light On, DTC P0410 Set, Water in AIR Pump
(Replace AIR Pump, Install New Hose and Shield)

Models: 2000-2002 Buick Regal 2000-2002 Chevrolet Impala, Monte Carlo
2000-2002 Oldsmobile Intrigue 2000-2002 Pontiac Grand Prix with 3.5L
or 3.8L
Engine (VINs H, K - RPOs LX5, L36)

Condition

Some owners may comment on the check engine light being illuminated.
Upon investigation, the technician may find a DTC P0410 indicating
that there is a concern in the secondary air injection system. When
removing the air pump, the technician may also note evidence of water
intrusion in the secondary air injection pump.

Cause

Water may have collected in the AIR pump and frozen or corroded the
pump.

Correction

Replace the Secondary Air Injection Pump and install a new hose,
shield and cleaner using the following procedure:

1.Raise the vehicle.
2.Remove fasteners from splash shield and reposition splash shield to
gain access to AIR pump.
3.Compress the pinch clamp and remove outlet hose from pump.
4.Remove inlet hose from pump.
5.Remove fasteners holding pump.
6.Reposition pump, disconnect electrical and remove pump.
7.Lower the vehicle.
8.Remove support brace over air cleaner box.
9.Remove air cleaner box cover and filter element and reposition ECM.
10.Remove lower air cleaner box.
11.Remove old AIR inlet hose.
12.Transfer old lower inlet hose to new upper hose with new clamp.
13.Install new hose to shield.
14.Install new cleaner assembly to hose inside shield.
15.Position new assembly in vehicle and install new strap in place of
removed strap to hold hose in place.
16.Drill (3) 1/4 (6 mm) holes using the shield as a template and
install new plastic clips.
17.Install lower air cleaner box.
18.Install air filter, ECM and air cleaner boxcover.
19.Install support brace.
20.Raise the vehicle.
21.Position lower inlet hose and tighten new clamp.
22.Transfer parts as necessary from old pump to new pump.
23.Connect electrical connector and route wiring harness.
24.Install pump and bolts (3).
25.Tighten bolts.
Tighten
Tighten the bolts to 9 N.m (80 lb in).
26.Install inlet hose to pump.
27.Install outlet hose to pump.
28.Install splash shield and bolts.
29.Lower the vehicle.
30.Clear the P0410 DTC code.
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-GV