Auto trans on my 2000 540 acting up. Shifting medium to hard--no change. Grandma mode causes confusion for tanny--what geat should I be in--interstate has slight surging a metalic sound that almost has a rythem and sound cycle. Should I change the tranny fluid? Could this be software? Is it time to sell her?
You might try changing the trans fluid and filter, or having the transmission flushed. Check condition of the fluid first. I would probably suggest selling the vehicle as it could also be something major, like a front pump going out, or solenoid packs in the transmission, which can easily run several hundred dollars to replace.
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