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Old May 17, 2023 | 08:44 AM
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Default GM Document ID 5406413

Hello All,

Just installed a Cat Back Corsa AFM/NPP exhaust. Car is throwing a CEL. I see reference made to the GM doc to relearn the AFM valves.

I looked on the web but can’t find the actual document with procedure. Anybody have it? I would appreciate.

Also will a aftermarket GM Scan tool work?
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May 23, 2023, 07:51 PM
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Good news. Amazon bi directional scanner Creader Elite for GM works. I was able to clear both codes and get rid of CEL. $169. This one I will keep
Old May 17, 2023 | 08:47 AM
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Dealer has to perform the service; most seem to be charging around $100. I've yet to see the actual document shared online.
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Old May 17, 2023 | 08:50 AM
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Figures.

Okay. Thanks for the quick text.
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Old May 17, 2023 | 08:56 AM
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Originally Posted by mrsuds
Hello All,

Just installed a Cat Back Corsa AFM/NPP exhaust. Car is throwing a CEL. I see reference made to the GM doc to relearn the AFM valves.

I looked on the web but can’t find the actual document with procedure. Anybody have it? I would appreciate.

Also will a aftermarket GM Scan tool work?
The procedure in the Service Manual does require a scan tool. I do not know if aftermarket tool will work.








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Old May 17, 2023 | 04:19 PM
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Alot of aftermarket bidirectional scanners can do it. Personally I have a Zurich Pro that I did mine with.
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Old May 18, 2023 | 02:18 PM
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Originally Posted by mortelec
Alot of aftermarket bidirectional scanners can do it. Personally I have a Zurich Pro that I did mine with.
I keep hearing different things on this topic... would you be able to give us a picture of the Zurich pro doing this relearn ?

I just installed the Corsa exhaust too on my C8 and my local dealer wants to treat it as a warranty claim and asking me to 'remove the aftermarket parts' to look at the CEL ::smh::
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Old May 18, 2023 | 03:20 PM
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Originally Posted by jpmotorsport
I keep hearing different things on this topic... would you be able to give us a picture of the Zurich pro doing this relearn ?

I just installed the Corsa exhaust too on my C8 and my local dealer wants to treat it as a warranty claim and asking me to 'remove the aftermarket parts' to look at the CEL ::smh::
Yeah, no, that won't work. I guess you knew that. The new exhaust comes with its own AFM valves, and you re-use your actuators (remove them from the old muffler and put them on the new one) (assuming your Corsa has the valves). So, for sure, the software controlling the actuators must relearn with the valves on the new muffler, that is whole point. And its not a warranty issue (I assume you know that too) - its a relearn that was made necessary when the muffler was changed out. But its no big deal. If you notice, in the description of the procedure, the process it self takes about 10 seconds.
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Old May 18, 2023 | 03:57 PM
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It's not rocket science. It actually takes less than a minute once you hit relearn. Not sure conflicting on whether the Zurich can do it or not apparently who says it can't doesn't know what they are doing. Like I said I've done it myself with the Zurich Pro.

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Old May 18, 2023 | 05:05 PM
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So I’m guessing it’s safe to say that an aftermarket scanner should work. Question- would a scanner you can rent from Advance auto parts work? A Zurich Pro is $800. That’s expensive for a one time use tool.
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Old May 18, 2023 | 05:07 PM
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Originally Posted by mrsuds
So I’m guessing it’s safe to say that an aftermarket scanner should work. Question- would a scanner you can rent from Advance auto parts work? A Zurich Pro is $800. That’s expensive for a one time use tool.
It has to be a bidirectional scanner. Autel , Snap ,On Solus, Zurich ect
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Old May 18, 2023 | 05:11 PM
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Well I guess it’s off to Harbor Freight and buy the scanner. Will probably return after the 10 sec relearn
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Old May 18, 2023 | 05:41 PM
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Originally Posted by mrsuds
Well I guess it’s off to Harbor Freight and buy the scanner. Will probably return after the 10 sec relearn
That's pretty lame if you return it only because you don't need it anymore. I hope they charge you for the free $500 subscription that's included that you have to activate.
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Old May 18, 2023 | 07:25 PM
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Originally Posted by mortelec
That's pretty lame if you return it only because you don't need it anymore. I hope they charge you for the free $500 subscription that's included that you have to activate.
To each his own.. if you are in New York, I would pay you to clear my CEL
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Old May 19, 2023 | 12:23 AM
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I suggest you check with other dealers. I'm sure many will be happy to do the re-learn procedure for you. I know many members here (including myself) have had their dealers do this after installing after-market exhaust. Much cheaper and easier than buying a scanner.
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Old May 23, 2023 | 07:51 PM
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Good news. Amazon bi directional scanner Creader Elite for GM works. I was able to clear both codes and get rid of CEL. $169. This one I will keep
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Old May 24, 2023 | 04:42 PM
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Thanks for sharing !!!
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Old May 24, 2023 | 08:00 PM
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Does it have the ability to do a DCT hydraulic system flush?
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Old May 24, 2023 | 08:10 PM
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Originally Posted by RKCRLR
Does it have the ability to do a DCT hydraulic system flush?
I will check tonight.
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Old May 24, 2023 | 08:26 PM
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Originally Posted by mrsuds
I will check tonight.
Look also for Hydraulic Control System Cleaning Procedures. In the 2020 Service Manual that I have, there is a list of individual cleaning procedures, each addressing 1 or 2 specific valves. My version of the manual does not have the Hydraulic System Flush Procedure - which I believe, but have no proof, is a where the one or more (and maybe all) of those individual cleaning procedures is performed in some sequence. However, even if my belief is true, the order in which they are performed is not known (as far as I know) - and the order may be important.

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Old May 24, 2023 | 09:24 PM
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Originally Posted by RKCRLR
Does it have the ability to do a DCT hydraulic system flush?
slSorry no dice. Went into the scanner > transmission control module. Looked for the flush function. Didn’t find it.
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