I do not know why your local Mitsubishi dealer cannot figure this one out. What you are describing is a known problem for which Mitsubishi has published a Technical Service Bulletin (TSB).
The problem is caused by incorrect transmission fluid levels and there is an updated dipstick included in the fix.
MITSUBISHI TSB REFERENCE NUMBER: TSB-10-23-005
You may also want to talk to your son about heeding warnings from your vehicle's onboard computer system. When the CVT transmission begins to overheat, the CVT light will come on, a warning chime will sound, and the words "SLOW DOWN" will be displayed in the Muti-informational Display. This will occur LONG before the vehicle goes into "REDUCED POWER" mode. If he would slow down as he is being told to, the warnings will extinguish themselves as soon as the transmission fluid temperature drops to a safe level (which it will, if he slows down).
REDUCED POWER MODE is like an angry parent...."OK, you don't want to slow down like I told you to do, and you are going to destroy my transmission by ignoring my warnings, so I am shutting you down!!! You won't slow down, so I am slowing you down! Now, if you do not want this to continue, then you better start listening to me!"
Similar things will happen if you choose to ignore engine control or Brake/Traction Control warnings. The old days of ignoring warning lamps and running around with your dash lit up like a Christmas tree are over. There is a new sheriff in town called REDUCED POWER MODE.
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My son brought his 2009 Mitsubishi Lancer for your store and has had it
service at your store. His car has 62,000 miles on it. Your service did a
transmission service at 38,655 miles on 4/5/2012. Since my son moved to
Maryland, he had another Mitsubishi dealer, in Baltimore, MD, do a radiator
flush at 59,788 miles on 5/9/2012 along with having a Exhaust Pipe Seal Ring
replaced. Since then he has had the below problem with his car.
Since the last service every time he drives the car on a long trip about
150-170 miles. At about roughly 60-70 miles, at 70-75 mph the CVT light
comes on to slow down which states (the Continuously Variable Transmission
CVT fluid or the Twin Clutch SST fluid temperature is increased.) The car
then puts itself into a safe mode, where he doesn't have any throttle
response and the RPMS hang around 3000-3500, until he can find a place to
pull over. Once pulled over he shuts the car off for about five minutes, he
restarts the car and the light has gone away and there is know problems for
rest of trip which is another 60-70 miles and about 70-75 mph. However, the
next trip the CVT light comes on again. This has now happened on three
trips. He has since then brought the car back to the Mitsubishi that last
worked on the car to run a diagnostic test and multipoint inspection with no CODES and no results as to what is causing the problem.
I have the same problem with my Mitsubishi Outlander 2009.
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