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Limp In mode on 1997 Dodge Grand Caravan

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My 97 Grand Caravan has about 190k on the speedometer. Never had a problem but the other day I was on the highway and tried to pass - RPM's went over 4000 and stayed there. Then Service Engine lite came on. The while the lite is on the vehicle will not shift up into drive and the RPMs stay high. Once the lite goes off the car is driveable. I am getting code 45 - something to do with "Turbo" and I don't have a turbo engine. However, every time I have tried to pass at speed the problem reoccurs.
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It's time to visit a shop for a thorough diagnosis. Here is some background on the check engine light: http://repairpal.com/check-engine-light

If you are going into limp mode, you have a significant problem that needs to be addressed.
It is not the check engine lite that is on...it's the Service Engine Lite.