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4T65E won't upshift
I'm trying to diagnose a transmission problem in a 2008 Chevy Impala - 3.5L V6, 4T65E trans. It will not up-shift automatically. Take off in "D", it will not up-shift, stays in 1st gear. You can manually shift by moving the selector between 1-2-3. Reverse is f... Login to read more. 
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| Engine | 3.5 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2008 Chevrolet Impala LS 3.5L
| Engine | 3.5 L |
| Trans | 4-speed Automatic (Electronic) |
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