lgtPR Posted November 9, 2021 Share Posted November 9, 2021 Hi My car Legacy GT 5eat has been weird. It runs and at some times you can hear a clank sound on the back part and the car shifts to a higher gear. usually happen when shifting from 1 to 2. Scanned the car and had the following codes P0817, P0756, P0766, P0763 and P0700. if i turn the car off it works again fine for a little time. I havent used the car for almost 2 years now and i want to fix it. Car had Mobil 1 AT oil and is full. Link to comment Share on other sites More sharing options...
whitexc Posted November 9, 2021 Share Posted November 9, 2021 The first no no is the Mobile fluid. Was a complete flush done to get that fluid in or is it mixed with the OEM, recommended fluid? Idemitsu HP is what should be in the transmission. Google the codes. Sounds like you have a few issues to address. An engine related code could lead to running issues and shifting issues. These transmissions are known to have a few quirks in my short time being involved here. There is a failure that occurs with a hall affect sensor (speed sensor 2) attached to the valve body. It is associated with hard shifting. There are walk throughs out there explaining how to replace this. It doesn't look like a horrible job with dropping the valve body and doing some soldering of wires. It's on my list of to do's. Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
lgtPR Posted November 10, 2021 Author Share Posted November 10, 2021 Fluid is mixed. Like 3 mobil 1 quarts. Would you reccomend a flush before anything else? Link to comment Share on other sites More sharing options...
Pleides Posted November 11, 2021 Share Posted November 11, 2021 A flush would likely help a fair bit with rough shifting if the fluid is original. Some people will tell you flushes are bad for your trans, but I've never seen anything substantial to prove this and Subaru doesn't advise against it. Manufacturers usually explicitly state not to do it if they don't want you to in automatics. There are 8 or so quarts throughout your transmission that didn't get replaced and changing out three quarts is a drop in the bucket. Link to comment Share on other sites More sharing options...
whitexc Posted November 11, 2021 Share Posted November 11, 2021 I would only advise a flush if it were done by a subaru shop/stealership that stood behind it. Depending on the miles it can move sludge and debris through the system that was there prior but not necessarily in a bad way. Start getting that junk in the valve body and you are asking for trouble. I would do drain and fills with OEM fluid. There are plenty of walk throughs on the interwebs. If you can unhook the cooler lines and push fluid out in measured amounts and replace it with fresh at a controlled rate you will get it all within a few cycles. Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
captainobvious Posted November 11, 2021 Share Posted November 11, 2021 i would also suggest getting a new atf filter and replacing that, if you have no idea when if it was replaced last, i would replace that as well as doing a drain and fill on fluid. Word to the wise ive done my 5eat twice and only use Subaru OEM fluid. Link to comment Share on other sites More sharing options...
lgtPR Posted November 11, 2021 Author Share Posted November 11, 2021 Ok will order fluid now and the filter and report back. If it stills with issue which step would you take? Link to comment Share on other sites More sharing options...
whitexc Posted November 11, 2021 Share Posted November 11, 2021 Order a VagCom cable off eBay, download FreeSSM and perform a reset on the transmission TCU. If it still acts up it may have issues. Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
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