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Discussion Starter #1
So basically, I am trying to keep my Mazda on the road because I love driving it up until now. I have not had to spend a lot of money on my 6 to keep it in tip top shape. I like tinkering around and so can do some minor repairs myself. For example, I replaced the spark plugs and ignition coil boot sets this summer. I also replace the throttlebody and MAF sensor this summer without any assistance - other than YouTube. But that was stretching my skill set. This latest problem with the transmission is way out of my pay grade for sure. I have taken it to a local transmission shop that comes highly recommended. He did give me a great discounted price on the Transmission Control Module which he purchased directly from our local Mazda dealer parts department. He also only charges me $90 per hour labour which is good in Ontario, Canada considering that the dealer wants $165 per hour. But to the point, after replacing the TCM last week the D light is still intermittently coming on late as I start to drive the car. The car seems to hesitate almost as if the first gear is slipping. After a few seconds or minutes the D light will come back on usually and all is back to normal. However, this D light flash tends to increase in the number of times that it occurs as the days and weeks go by. So I was going to go ahead and order a new remanufactured transmission from the dealer and have the transmission shop install it. My only concern is that there may be another electrical issue that is at play here impacting the transmission operation and the dash D light. By the way if I switch over to Manual drive mode when the D light is not showing on the dash the AT light illuminates on the dash. I just want the car fixed and to be reliable, I can't stand this back and forth and back and forth nonsense. Any ideas?
 

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My suggestion is to go back to the guy who installed the TCM. He might know an easy fix, a sort of "back job warranty".
 

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Discussion Starter #3
Everyone will want to know this Transmission Fix
I am providing an updated solution for anyone that ever encounters a similar problem with their 2nd generation 2.5L 5speed automatic transmission. To bring everyone up to date without having to read the entire write up, let me provide a brief summary of my transmission issues. First I am the first and sole owner of this 2010 Mazda 6 GT i It has been a great car for me and currently as 156000 km's on it. A short time ago the transmission started acting up Initially it was not shifting properly at times on the highway. It would search for a gear when passing and then on one trip it went into limp mode when travelling up a fairly steep hill on the highway. I was able to get back home and make an appointment at a transmission shop recommended by my Mazda dealership. They found a blocked oil pressure switch and cleared it, cleaned it up and sent me on my way for a very small charge. Shortly after that I had to take it back in for what can be described as a bang sound in the transmission when driving on the highway. This time it cost me just over $1000 to replace the Transmission Control Module. However, my problems did not end there. Next, the D light on the dashboard started to interittently flicker off then back on. This happened primarily during the first drive of the day and ususualy lasted only a few minutes. However, when the D light was off the transmission was behaving oddly. Sometimes it simply would not shift at all. Sometimes it seemed to be trying to start off in a high gear like 3rd gear and it was not particularly pleasant. In any event this crazy behaviour usually only occured during the first drive of the day and did not last for more that a few minutes - the rest of the day the car shifted perfectly. This behaviour gradually started to happen more and more frequently throughout the day and of course was quite annoying. No codes were picked up by the code readers. But here is the solution - it is the neutral safety switch. Yes indeed that is all that needed to be replaced. I had dealers suggesting that I needed a new transmission for $4000. My repair came in at just over $150 parts and labour. Hows that for beating the odds. This is one for the books and one to remember for certain so that you don't get stuck with having to buy a new transmission when all that you need is a range sensor switch. Happy Motoring!
 
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