Question about 2006 Pontiac Grand Prix

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Check Engine Light on -- No Problems Found

Our check engine light came on on our 2006 Grand Prix. We took it in to my local repair guy and they ran the scan. These are the two errors found:

PO411 - Air Injection System Incorrect Flow
PO1660 - Cooling System or TCM Gen Input Circuit Fault

My repair guy checked both out and found no problems. He reset the light. I was able to drive the car home (15 miles) and the light did not come back on. The next day when I turned the car on...the light came back on. My repair guy said that I can bring the car back on to see if it is the scan says the same errors.

I have two questions:

1. Should I be worried about driving my car? I drive 30 miles round trip every day and I have to make a 300 mile trip in the near future.

2. Is there something my repair guy could be missing?

Thank you!

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  • 1965comet Oct 23, 2008

    changed manifold o2sensor and now car is running rough and really stinks and getting really bad gas mileage. please help



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You don't have to worry about P0411. But you need to fix.
because the vehicle will burn more gas...
Let me Explain a little bit. of the SECONDARY AIR INJECTION SYSTEM.
Your vehicle use a Vaccum Electric pump. to reduce the HYDROCARBOM EMISSION , During a Cold start the System forces filtered fresh air into the exhaust stream in order to accelerate the catalystic operation.
The IAr is send to the exhaust passing from a check valve.
The code P 0411 , Can be a restriction on the hose coming from the Air pump to a Exhaust. or The hose damaged or pinched.
But the first step is check the operarion of the pump.
Check the Air pump relay. and fuse.

The pump Is located on Left Front Frame Rail, Forward of Fenderwell.

P1660. This code refer to a : Excessive Current or Voltage ON the system.
Check The ALTERNATOR for proper Voltage charging.
If the Alternator is charged more than 16v. replace the alternator.
Remember if you gave a Jump Cables of any time or day.

Any of this will the code P1660 come..
After you check the Charging system. And detect that everything is in order, Clear the light.

PRINT THIS COMMENT and give to your mechanic....

I hope this will help on your problem.


Posted on Aug 04, 2008

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It could be you edg valve or some thing like that. you never know. Drive your car and watch the water temp it should rune around 185 to 210 if is not in this range after a while of driveing you have a problem and a big one if you keep driveing it. There are several items in the cooling system. first off if you have over heated the engine you could have broke the internal thermastat and the coolent is only running by the blow by because the valve is not opening or its stuck open, but there could be tons of other problems. try another shop.

Posted on Nov 21, 2008


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