The bypass valve is also one of those things that when it does finally work, the damage is already done. If the filter has stopped up and the bypass is functioning, how much trash passed through the engine before it did eventually bypass. Too little too late by this point.
It was likely created by the enginauts(engineers that think their astronauts)at GM to save a warranty claim, assuming your idiot light didn't burn out and you were able to catch it in time.
