P0778 code - Page 2 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #11 of 17 (permalink) Old 12-23-2018, 05:06 PM
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Originally Posted by Tekboy View Post
Thanks for your response. Fluid level is good, and the fluid was changed along with a output speed sensor and pan replacement in February. Car is not "limping", though I certainly chose to drive it home less aggressively than usual.

Check your receipt paperwork to see how many quarts of ATF fluid was replaced and what type of fluid was replaced. i.e. Mazda MV, Castrol Import multi Vehicle, Valvoline Max Life multi-vehicle



If only 3 quarts was replaced you may have only received a drain and fill.


There is a small chance that a blockage in the transmission may trigger the error code.

"Tech notes When a transmission solenoid is malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced.

https://www.autocodes.com/p0778_mazda.html


https://www.mazda3forums.com/95-main...mazda-3-a.html
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post #12 of 17 (permalink) Old 12-29-2018, 02:44 PM Thread Starter
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Originally Posted by geeboss View Post
Check your receipt paperwork to see how many quarts of ATF fluid was replaced and what type of fluid was replaced. i.e. Mazda MV, Castrol Import multi Vehicle, Valvoline Max Life multi-vehicle



If only 3 quarts was replaced you may have only received a drain and fill.


There is a small chance that a blockage in the transmission may trigger the error code.

"Tech notes When a transmission solenoid is malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced.

https://www.autocodes.com/p0778_mazda.html


https://www.mazda3forums.com/95-main...mazda-3-a.html
We have gone way beyond this. The new TCM, upon visual inspection, looks like it may have fried internally, in less than 10K miles. The shop is having discussions by phone with Mazda Factory Techs in an attempt to find the actual problem, which would be causing it to fry TC Modules. Time will tell, but they say it may be ready by this coming Friday.
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post #13 of 17 (permalink) Old 12-29-2018, 03:32 PM
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We have gone way beyond this. The new TCM, upon visual inspection, looks like it may have fried internally, in less than 10K miles. The shop is having discussions by phone with Mazda Factory Techs in an attempt to find the actual problem, which would be causing it to fry TC Modules. Time will tell, but they say it may be ready by this coming Friday.
First of all, it's good to see you didn't give up on this forum, after your exchange with the idiot who (thankfully) was recently banned by the admin staff. I think that most of the regulars here were giving up on threads whenever he showed up with his act.

AFA the TCM, there have been prior reports of TCMs being cooked due to being located too close to engine heat. Here's one that talks about relocating the replacement TCM, in order to resolve the root cause. Perhaps you can discuss this with the shop doing the work.

https://www.mazda3forums.com/61-powe...tcm-issue.html

2011 3i 2.0 A/T 130K miles (daughter's ride which I maintain)
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post #14 of 17 (permalink) Old 01-11-2019, 10:50 AM Thread Starter
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OK, problem has been resolved. Apparently it was "merely" dirty contacts causing the problem, and after the actual diagnostics, which involved cleaning the connections, there have been no problems as of two tanks of gas now. My Transmission Guy (The Transmission Physician) in Eustis wouldn't even take any money for doing it, since it was his opinion that he should have cleaned that the last time I had it in for a repair. I really tried to pay him at least a diagnostic fee, but he wouldn't take it, claiming that he really didn't do anything.

I figured it would be like a boat (acronym for Break Out Another Thousand), but we just had to do without the car for a while was all.

Thanks for your support.
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post #15 of 17 (permalink) Old 01-11-2019, 11:17 AM
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Glad to read your issue is resolved with no extra expanse, and also that you have such a good shop to work with! And thanks for potentially helping others by following up with your outcome - most never do.
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2011 3i 2.0 A/T 130K miles (daughter's ride which I maintain)
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post #16 of 17 (permalink) Old 01-13-2019, 09:22 AM Thread Starter
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Glad to read your issue is resolved with no extra expanse, and also that you have such a good shop to work with! And thanks for potentially helping others by following up with your outcome - most never do.
Yes, I try to share the outcome, as it truly is a benefit to others, as well as being a sign of respect. I don't just come in here to take. I sure do like driving that car when it is right.
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post #17 of 17 (permalink) Old 01-13-2019, 10:06 AM
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Yes, I try to share the outcome, as it truly is a benefit to others, as well as being a sign of respect. I don't just come in here to take. I sure do like driving that car when it is right.
This was an interesting issue which I, for one, am glad you addressed and kept current. One of the frustrating parts about automotive forums is when someone comes along with a problem and there are several pages of posts filled with back and forth where people help the OP as the OP responds with actions taken. Then, the OP will end the thread something like this, "Hey everyone. I found the cause of the problem and my car runs great!! Thanks to everyone who helped." without explaining what the fix was. To top it off, there will be further posts from others asking what the fix was; however, the OP vanishes.
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2006 Mazda 3 2.3L Hatchback 5-speed Automatic - 180K miles
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