Have your transmission serviced and pressure test the transmission line. It sounds like the EPC (electronic Pressure Control) valve is starting to fail. Once the EPC valve fails, the transmission will default to the highest pressure and hard parts will eventually break. Easy fix in pan. Fix as soon as possible.
If your lucky it's going to be your TPS, Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace. TPS (Throttle Position Sensor)
Thank you for using fixya and good luck.
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WELL IF YOU SEE CHECK ENGINE LIGHT FLASHING CODE SCAN FOR TRANSMISSION FAULT CODES.IF YOU SEE NO CHECK ENGINE LIGHT FLASHING, TRANSMISSION FLUID OLD DIRTY CONTAMINATED. CAUSING SHIFT VALVES TO STICK. ALL MY GM TRANSMISSION I KEPT FLUID CHANGE AND ADD SOME TRANSMISSION ADDITIVES KEEP TRANSMISSION TO KEEP VALVES IN BODY TO MOVE FREELY CAUSING TRANSMISSION SHIFT SMOOTHLY.
http://repairhelpcenter.blogspot.in/2012/02/car-will-not-move-when-in-gear.html
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Mercedes-Benz transmission sticks in first gear?
http://technoanswers.blogspot.com/2012/01/mercedes-benz-transmission-sticks-in.html
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Mercedes Benz not engaging in first gear?
http://technoanswers.blogspot.com/2012/01/mercedes-benz-not-engaging-in-first.html
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Chrysler PT Cruiser only goes in First gear?
http://howtobyme.blogspot.com/2011/11/chrysler-pt-cruiser-only-goes-in-first.html
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Car is stuck in park and the shift will not move?
http://howtobyme.blogspot.com/2011/08/car-is-stuck-in-park-and-shift-will-not.html
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2002 Nissan sentra will not go out of park mode?
http://technoanswers.blogspot.in/2012/02/2002-nissan-sentra-will-not-go-out-of.html
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Nissan Sentra stuck in park?
http://technoanswers.blogspot.in/2012/02/nissan-sentra-stuck-in-park.html
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Car will not come out of Park?
http://howtobyme.blogspot.com/2011/11/car-will-not-come-out-of-park.html
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Automatic transmission will not go into high
gear?
http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html
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Car won't downshift sometimes?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-downshift-sometimes.html
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Buick Park Avenue: Transmission will Not
shift into drive?
http://schematicsdiagram.blogspot.com/2011/12/buick-park-avenuetransmission-will.html
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No
First gear Starts In Second Gear
http://www.howtobyme.blogspot.com/2012/07/no-first-gear-starts-in-second-gear.html
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Ford Taurus won't shift from park?
http://schematicsdiagram.blogspot.com/2011/12/ford-taurus-wont-shift-from-park.html
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2006 Ford F150: Will Not Shift out Of Park?
http://technoanswers.blogspot.in/2012/06/2006-ford-f150-will-not-shift-out-of.html
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Car Transmission will not go into Park mode?
http://schematicsdiagram.blogspot.com/2011/12/car-transmission-will-no-go-into-park.html
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1998 Chrysler Voyager: Transmission Problem?
http://howtobyme.blogspot.in/2012/06/1998-chrysler-voyager-transmission.html
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Shift indicator directly goes to 2nd when key
is turned ON?
http://schematicsdiagram.blogspot.com/2011/12/shift-indicator-directly-goes-to-2nd.html
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Third gear missing and engine losing power?
http://schematicsdiagram.blogspot.com/2012/01/third-gear-missing-and-engine-losing.html
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Chevrolet silverado has whining sound in gear?
http://technoanswers.blogspot.com/2012/01/chevrolet-silverado-has-whining-sound.html
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2002 Chevrolet Avalanche Z71: Gear shift
Issue?
http://whoisbyme.blogspot.in/2012/06/2002-chevrolet-avalanche-z71-gear-shift.html
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Hard to shift gears on Manual transmission?
http://technoanswers.blogspot.com/2012/01/hard-to-shift-gears-on-manual.html
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Car hard shift at slow speeds?
http://technoanswers.blogspot.com/2012/01/car-hard-shift-at-slow-speeds.html
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Transmission-Hard To Down Shift
http://technoanswers.blogspot.in/2012/07/transmission-hard-to-down-shift.html
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Automatic transmission shift lever hard to move on cold
mornings?
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
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2000 Nissan maxima shifts hard?
http://schematicsdiagram.blogspot.in/2012/02/2000-nissan-maxima-shifts-hard.html
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Vehicle noticed sluggish delayed shifts while
driving?
http://schematicsdiagram.blogspot.in/2012/03/vehicle-noticed-sluggish-delayed-shifts.html
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2007 Hyundai Santa Fe: Will not Shift out of
Park Mode?
http://schematicsdiagram.blogspot.in/2012/06/2007-hyundai-santa-fe-will-not-shift.html
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These details will help.
Thanks.
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