Went into gas station left van running put it in reverse it shifted hard. As I drove home it started to whine slip n shift hard. No check engine light.. let it cool down over night. Marked out the oil dipstick hack to use as a transmission dipstick let it get up to operating temp the check engine light came on gave me error code p083b by doing the key dance my question to you guys is will a fluid and filter change fix that or is it a solenoid pack and if it is a solenoid pack will a lifetime powertrain warranty on hard Parts cover that? Fluid looked a lil dark and possible over filled 60k ago when they did fluid and filter at dealer.