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Originally Posted by GGraham
Have 2007 Pontiac G6 V-6 auto. Yesterday, cruise control stopped working and it feels like the auto transmission is shifting hard. Also, I put gear shift into "L" and it still shifts through the gears. Same thing with "Drive 3". Can cruise control mechanism affect transmission function, or visa versa? Does this sound like an electrical malfunction? Car has 40k miles, so if transmission/power train, it should be under GM warranty. If electrical or computer, may not be covered. Any ideas? Thanks!
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It sounds like a computer glitch with the TCM... but there is always that possibility that it's something else. If you are still covered by the warranty I'd take it in and have it checked out.