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Re: 01 GTP not shifting into overdrive
Welcome to AF.
One thing you can do is get it scanned with a scan tool capable of reading out transmission related DTCs. That way you can see if it is a solenoid at the valve body like a 3-4 shift solenoid. However, the problem of no OD (4th) can be mechanical due to a bad 4th spline which is a common problem in a 4T65E autoransaxle.
Some TCC related DTCs may disable OD.
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