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Old 10-29-2008, 03:23 PM
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Question New ECU Questions
If i were to get a backup ECU to do tuning and if i were to have any problems and switch to my stock ECU could the dealer notice?
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Old 10-29-2008, 03:31 PM
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I planned on doing the same thing....put my custom tune on the other ECU...keep my stock stage 2 tune on the oringinal ECU....will this work to keep warranty intact?? Does not seem to be much interest in used PCM's for sale....??
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Old 10-29-2008, 03:47 PM
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i agree bro

bump for more info
Last edited by ikeryder13; 10-29-2008 at 03:47 PM. Reason: Automerged Doublepost
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Old 10-30-2008, 03:44 AM
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bump?
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Old 10-30-2008, 01:55 PM
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bump
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Old 10-30-2008, 02:19 PM
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I have a couple extra ones sitting around... I paid over $100 each and some shipping. Might find one around that price range. I see them every now and then. Sometimes the owner wants 2 or 3 hundred though because it has a crappy canned tune on it that I would never use, maybe for a 2.6 pulley or something....
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Old 10-30-2008, 03:16 PM
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but can a dealer notice if i swap back the stock ecu?

bump?
Last edited by ikeryder13; 10-30-2008 at 03:16 PM. Reason: Automerged Doublepost
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Old 10-30-2008, 03:21 PM
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I don't know for sure if they could tell or not. If the ECU detects a difference in odometer readings then I would say yes, they will be able to tell. Don't know if the ECU will set any code or anything for this though.
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Old 10-30-2008, 03:23 PM
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yeah i just dont want a sensor setting off because i remove and replace it...
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Old 10-30-2008, 03:27 PM
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You would need to do a crank sensor relearn on the new PCM. Which requires a dealer, or a shop with Tech II
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Old 10-30-2008, 03:57 PM
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i wanna do some tuining but i dont want it to void my warranty
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Old 11-02-2008, 02:39 AM
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Originally Posted by camarokiller
You would need to do a crank sensor relearn on the new PCM. Which requires a dealer, or a shop with Tech II
can this be done with HP Tuners??
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Old 11-04-2008, 12:28 PM
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yes can it?
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Old 11-04-2008, 12:53 PM
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HPTuners can do CASE relearn...

HOWEVER....

For ECT (drive by wire) cars like the cobalt, the function currently does not work. So, you will have to use a tech II to get the relearn done.
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Old 11-04-2008, 01:00 PM
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do you NEED to do it.. or will it just throw a code?
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Old 11-04-2008, 01:03 PM
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is the dealer the only one with tech 2?
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Old 11-04-2008, 01:04 PM
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As far as GM's instructions for a pcm replacement is concerned it is required to do a case relearn.
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Old 11-04-2008, 02:33 PM
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i tried using another PCM and was not able to do a case relearn with the HPtuners, i believe i still have mine for sale.
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Old 11-04-2008, 03:08 PM
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Originally Posted by ikeryder13
is the dealer the only one with tech 2?
You can buy them... they are a bit pricey though....

http://www.autorepairmanuals.biz/sit...roduct/OTC3646

I'm sure there are other repair shops that have them as well, you can try calling around.
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Old 11-04-2008, 04:05 PM
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Does anybody know why i didn't have to do a relearn with my zzp pcm?
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Old 11-04-2008, 04:08 PM
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see thats what i mean! if i buy another pcm from somewhere else and tune it then its ok?
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