Why would the Over Drive turn off while driving on the highway?

Asked by Mar 27, 2017 at 10:21 AM about the 2001 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

While driving on the highway going about 70mph. the over drive turned off giving a thud feeling like the car down shifted. then the over drive would not turn back on. there is a light saying "O/D off"

1 Answer

28,055

Most likely a worn torque converter lockup clutch or TCC solenoid. That "thud" is very indicative of that. When it starts to go it can cause a loss of top gear/overdrive first. Read more here on symptoms of a bad lockup clutch: http://www.freeengineinfo.com/tcc-torque-converter-clutch-lockup-conve.htm

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