Hi Scotty, I have 2015 GMC Terrain SE FWD 2.4L automatic. I have gotten code P0411 code. I have checked the secondary air pump and it works, both valves were replaced recently and they open and close. I suspect carbon filled the ports on the head. The TSB report says to use GM top engine cleaner due to plastic parts. Do you think ATS Carbon clean would clean carbon deposits better than GM product. I don't want think of having to remove the exhaust manifold to manually trying to pick away carbon to it clean out. Thanks!

Yes the ATS cleaner works much better. Pray it works cuz if it doesn't you might have to have them physically cleaned with the sandblaster using walnut shells

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P0411 code 2015 GMC Terrain 2.4L

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15/11/2023 7:54 pm

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Hi Scotty,

I have 2015 GMC Terrain SE FWD 2.4L automatic. I have gotten code P0411 code. I have checked the secondary air pump and it works, both valves were replaced recently and they open and close. I suspect carbon filled the ports on the head. The TSB report says to use GM top engine cleaner due to plastic parts. Do you think ATS Carbon clean would clean carbon deposits better than GM product. I don't want think of having to remove the exhaust manifold to manually trying to pick away carbon to it clean out.

Thanks!

CoachK

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16/11/2023 5:43 am

Yes the ATS cleaner works much better. Pray it works cuz if it doesn't you might have to have them physically cleaned with the sandblaster using walnut shells