I have a 2015 Subaru Legacy automatic. I have had no problems with this car since I’ve bought it new. I just had the transmission fluid flushed and replaced with new fluid last week and today I just noticed a hard shifting between gears 1-2. It feels like the car is kicking. It does not do it once you get over 2, it is a smooth ride there. You only notice it on city roads because you’re driving slowing and accelerating gradually. No dash lights have come on indicating a problem. I’ve looked at numerous forums and I’m debating either bring it back to the dealer to see if they screwed something up with the transmission flush, or swapping out the knock sensor.
What makes this problem better or worse?
It’s worse when you are gradually accelerating
How long has your 2015 Subaru Legacy had this problem?
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"Flushing" an automatic transmission is often not great to do. You can actually stimulate debris to move throughout the transmission and create issues perhaps where check balls are in the valve body, and so forth. I'm not certain about Subaru but most manufacturers -- if anything - recommend draining and filling only.
It is possible that there is now a concern due to the flush -- and if the dealership is the one that did it - typically they network with a third party who provides flush equipment and additives and should have a way to help you. Definitely see them right away.
