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A few years ago, the traction control quit working on my 1998 Firebird. The service manager asked if I had changed anything in the PCM. I said no (which was the truth). He told me they would have to check, and it would not be covered if the 'tuning' had been edited.
So in addition to affecting the powertrain warranty, editing the ECM firmware can void the warranty on anything monitored/controlled by this computer.
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Black 2SS ordered 1/4/2010, received 2/19/2010
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