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As title states having an issue with my car's transmission. Car will drive for a couple of miles then it is like it shifts into neutral. Engine revs but will not move forward or reverse. Turn key off, let sit for a couple minutes. restart and everything back to normal for a couple of miles then reoccurs. If car left in park and idling after engine comes to temp and after about 10 minutes of idle. transmission does not work. Turn key off and restart transmission is functioning again. Fluid has been drained and refilled with new Dexron VI. Seems to shift normal when working. Hoping something simple. No DTC codes or Check Engine light.
 

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As title states having an issue with my car's transmission. Car will drive for a couple of miles then it is like it shifts into neutral. Engine revs but will not move forward or reverse. Turn key off, let sit for a couple minutes. restart and everything back to normal for a couple of miles then reoccurs. If car left in park and idling after engine comes to temp and after about 10 minutes of idle. transmission does not work. Turn key off and restart transmission is functioning again. Fluid has been drained and refilled with new Dexron VI. Seems to shift normal when working. Hoping something simple. No DTC codes or Check Engine light.
Really need to post what year/engine tranny combo. I am not really knowledgeable about the ATs on the Regal but if they are anything like the ATs on the V6 models(LaCrosse/Impala), the electronics(TECM) are inside the tranny(right inside the cover/sump) and are being affected by heat. Transmission shops (at least the good ones) have specialized readers. You may want to see if you can get it to one and have them go thru the whole experience "connected" so they can evaluate. If it is the TECM, they are pricey and after installation may need to be programmed to the car before you even try to run it.
 
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