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Have a warning light on and was told that the secondary air injection system shut off valve was stuck open. What does that mean? Is it OK to continue driving? Is it expensive to fix? Does it need to be fixed?

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The shut off valve allows injection of fresh air to the exhaust so that your catalytic converter will 'light off' earlier-it is an emission control, and it will not be a catastrophe if you drive it like that for the time being, but the cause may be simple-check for a blown fuse under the hood in the power distribution center, that is likely the problem. If not, check of a vacuum leak, and finally disconnect the negative battery cable, leave it off for 5 minutes, and reconnect it-see of the Check Engine light comes back, if it does, you may need to have the valve replaced or in the very least, removed and cleaned.

Posted on Apr 08, 2011

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2008 trail blazer 4.2 4x4 fan under the hood runs all the time. Why how to fix?


What fan ? Your vehicle doesn't electric cooling fans , has engine cooling fan and clutch driven by the crankshaft via the drive belt. Your probably taking about the
Secondary Air Injection System Description .
The secondary air injection (AIR) system aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. This occurs when the start-up engine coolant temperature (ECT) is between 5-50?°C (41-122?°F), and the intake air temperature (IAT) is between 5-60?°C (41-140?°F). The AIR pump operates 5-60 seconds after start-up.
The engine control module (ECM) activates the AIR system by simultaneously supplying grounds to the AIR pump and the AIR valve relays. This action closes the relays' internal contacts. The AIR pump and the AIR control solenoid valve/pressure sensor assembly are in turn energized, the pump runs and the control/shut-off valve opens.
The AIR pump sends pressurized fresh air into the pipes/hoses through the open control/shut-off valve, and into the exhaust manifold. The extra air accelerates the catalyst operation, helping it to reach operating temperature faster. The AIR pump remains ON for a short period of time after the control/shut-off valve is commanded OFF. When the AIR pump is commanded OFF it will not run or be activated until the next vehicle start. When the AIR system is inactive, the closed AIR control/shut-off valve prevents air/exhaust flow in either direction.
In the under hood fuse box find AIR PUMP fuse # 64 60amp pull the fuse an see if the fan goes off . There are two relays secondary Air injection (AIR ) pump relay . The contacts may be stuck together .
In the under

Oct 05, 2016 | 2008 Chevrolet Trailblazer

1 Answer

I have a service engine soon light on and have hooked up an OBD11 reader to it and got code P0410 pertaining to a secondary air injection problem. hoses are fine, pump is new.


P0410 Oldsmobile - Secondary Air Injection System Malfunction

Possible causes: - Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

Tech notes: Visually inspect AIR pump and AIR bypass valve harness and connector, if connector are OK, then replaced AIR bypass valve.

When is the code detected? The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.

Possible symptoms: - Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation

P0410 Oldsmobile Description An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.
P0410 Oldsmobile Secondary Air Injection System Malfunction

May 30, 2015 | 2001 Oldsmobile Intrigue

1 Answer

P0410, p2101 and p0014 codes


Possible causes
- Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed
help.jpg What does this mean? When is the code detected?
The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation
P0410 Description
An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

Read more: http://engine-codes.com/p0410.html#ixzz31FMsMMLJ

Mar 27, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

I replaced my secondary air check valve on my 2001 chevy tahoe but code 1416 still comes up. what else can i check


here is what i found on p1416.



P1416 Chevrolet
P1416 Chevrolet - Secondary Air Injection System Bank 2
Possible causes
- Faulty Secondary Air Injection (AIR) pump
- Secondary Air Injection check valve bank 2
- Secondary Air Injection (AIR) pump electrical circuit fault
- Blocked Secondary Air Injection (AIR) system

When is the code detected?

The P1416 code is set when no O2 sensor voltage change is detected by the Engine Control Module (ECM).


Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)


P1416 Chevrolet Description
An Secondary Air Injection (AIR) pump is used on this vehicle to lower tail pipe emissions on start-up. The PCM supplies a ground to the AIR pump relay, which energizes the AIR pump. The Powertrain Control Module (PCM) monitors the HO2S voltages to diagnose the AIR system. During the AIR test the PCM activates the AIR pump during closed loop operation. When the AIR is activated, the PCM monitors the HO2S voltages and short term fuel trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.

Jan 23, 2014 | 2001 Chevrolet Tahoe

1 Answer

Newly installed EGR Valve stuck open


A code P0411 means that there is insufficient flow in your secondary air injection system, this is totally separate from the egr (exhaust gas recirculation) system. Has the vehicle been re-scanned? You should also know that if an egr valve is stuck open, the vehicle would be almost un-driveable, as it would create a huge vacuum leak.
If the same code is coming up, I would take a very close look at the hoses going to and from the injection pump. Check for any kinks or damage.

Feb 08, 2013 | 2007 Chevrolet Cobalt Coupe

1 Answer

Code po410


P0410 - Secondary Air Injection System Malfunction
Possible causes- Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

This is likely a pump problem caused by water being sucked into the secondary air injection pump under the hood.

Aug 29, 2012 | Chevrolet Cars & Trucks

1 Answer

How to clean secondary air injection incorrect upstream flow detected Code PO411


The valve may need to be replaced. Only air flows thru the components.

Jul 03, 2012 | 2008 Chevrolet TrailBlazer LT

2 Answers

Grand Prix pontiac error code p0411 and p2440


P2440 refers to the Secondary Air Injection system. It means that the switching valve is stuck open. We already replaced the secondary air flow pump, now it's telling us that's its the secondary air flow sensor and the valve is stuck open. the code is coming up P2440

Oct 15, 2011 | 2006 Pontiac Grand Prix

2 Answers

I have the following codes po410 and po491.......can u please tell me what they are so I can get my car fixed asap


P0410 - SECONDARY AIR INJECTION (AIR) SYSTEM
P0491 - SECONDARY AIR INJECTION (AIR) SYSTEM INSUFFICIENT FLOW (BANK 1)

Secondary air injection (trademarked as Air Injection Reactor) is a process where fresh air is injected into the exhaust system to allow for a fuller combustion of exhaust gasses.

The possible causes are:
SAIR pump low or now air flow
SAIR bypass solenoid leaking/blocked or stuck open/closed
SAIR diverter valve leaking/blocked or stuck open/closed
SAIR air hose restriction
SAIR vacuum hose restriction or leaking

Check to make sure your air filter isn't dirty - and replace if needed. Otherwise I would suggest having your local trusted auto repair facility diagnose and repair the issue. A scan tool will be needed to properly diagnose the issue.

May 27, 2011 | 2006 Ford Focus

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