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Hello, the engine winds out and wont upshift or it slips into neutral? No warning lights on like a flashing od lamp or check enginelight and any codes stored?
Well with the battery going dead it may erase any diagnostic trouble codes stored. You can get most codes read for free from most local auto parts stores but they may not be able to pull transmission codes depending on the scan tool they use.Definitely need to know why the check engine light is on to see if it is related and do a trans fluid level check since it should be a 6r80 trans with no real dipstick it uses a small one next to the catalytic convertor. With no upshift need to see if the PCM is commanding the shift and if any shift solenoid fault codes are stored. If no codes, most likely an issue with the valve body or internal trans concern
Very good, glad you got the concern resolved.