Got a 2009 Saturn Vue with 100,234 miles on it, and a engine light came on and I went to have it checked and it gave me a code for the transmission module or something is stuck open I forgot what it was but, it’s causing the transmission not to go in 3rd or 4th gear. A mechanic told me to have the transmission flushed and I’m not really comfortable with flushing the fluid considering the car is over 100,000 thousand miles. Should they drain the fluid change the filters and flush it out and put the old fluid in? I need help. I think it could be the valve body he was talking about. Thanks.
Never flush or drain that transmission!!! Aisin, the manufacturer of your transmission suggests flushing will damage it. The reason is you can't drain all of the flush and it thins the ATF.
If you are comfortable doing the work yourself, read my post below otherwise look for a new car. Don't bother paying someone to do what i suggest nor its not worth replacing.
With these transmissions pump out one qt of ATF at top of the transmission and install 1 new qt. Use T-IV ATF only and use nothing else. It is best to use Aisin's or Toyota's. DO NOT USE WS (world standard) atf.
Drive 100 miles and do it again. Repeat this process for about 8 times as it holds about 8 qts of atf. It may take the 4th time for it to improve.
DO NOT DRAIN! ONLY PUMP OUT 1QT AT A TIME! Otherwise it may not move at all if you drain it.
If it doesn't improve by the 8th attempt, last resort is adding MPT ZDDP. You get it on amazon. Take out 1 qt of atf and mix 4 oz of zddp ( you will dispose 4 oz of atf because you do not want to overfill it) and add it back to the transmission. This method works well but it isn't guaranteed since it sound like your transmission is on the way out.
