Q: Why will the car not go into overdrive. It is a 2004 corolla 4wd nze124 on 2004 Toyota Corolla

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
Driving on the highway, slowed down to a near stop cause of traffic, thereafter refused to go into over drive
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Is the overdrive off lamp "on" or "off"? Is the check engine light on? Has anyone pulled codes from the system? Common problems are with transmission fluid temperature sensor circuit, and with the OD switch circuit. These can both be monitored in scan data.
Over drive light will illuminate if pressed to the off position. The vehicle had a plugin service a day previously. The engine warning light is on as off this morning. 12hrs after the problem.
I solved the problem, the mechanic who did the computer plugin disconnected the overdrive switch, then did not reconnect properly.
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