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Discussion Starter #1 (Edited)
So I back out of the garage this morning and put the car in Drive. I notice that it's already in 3rd gear. And it stays there - no matter how fast I'm going or if I'm stopped. :eek: Anyone have any idea what the problem is? I immediately put it back in the garage after I went around the block.....:confused:

It's a 2005 Mazda 6 - V6 - 139,000 miles on the car - but a new (used) engine with only 27,000 miles on it......

Any ideas??
 

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Discussion Starter #3
Sorry....it's a 2005 Mazda 6 - V6 with 139,000 miles on it......No modifications. I have a new (used) engine which actually only has 27,000 miles on it.....

Any ideas?


20xx?

6i(4cyl)or 6s(v6)?

mileage?

Modifications?

Sent from my VZW Samsung Fascinate
 

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I don't own the automatic 6, but was your transmission ever serviced at much lower mileage?

Sent from my VZW Samsung Fascinate
 

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Sounds like the car is in limp home mode. 9 times out of ten, it is an electrical problem in nature. Check your batt/alternator please sir.

The ECU locks the transmission into 3rd on purpose. It's just the mode it goes into to get you home.
 

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I actually just had this same problem last week I have an 04 6i. Did you notice if your battery light was on? I ended up having a bad battery and alternator replaced them both problem went away.

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same problem

my car has done this 3 times now. 2005 mazda6i, 112,000 miles. i had it checked and they told me it was one of the 2 sensors that control upshift/downshift, but couldnt determine which was the problem, $600 to replace them both.

when i stop the car, the issue resolves itself, it goes back to first gear and it works fine again, CEL stays on for a few days then turns off.

anyone that had this issue figure out the actual cause?
 

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Sounds like your having a different issue. The OP's issue is something that the car does on it's own when experiencing electrical issues. Your problems don't seem to be electrical in nature, they seem transmission related.
 

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my car does on its own shift itself (on its own) into 3rd gear, all by itself, from any gear it is currently in (again ... on its own) and remains there in both auto and manual mode until the car comes to a complete stop (not on its own... i push on the brake pedal), then i can manually shift gears again, or the auto transmission can do it itself (on its own) ....

so yes, if you havent figured it out yet, this is something my car is doing ON ITS OWN
 

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.....yes.... and the OP's issue is the ECU locking the transmission EXCLUSIVELY into 3rd.. which is NOT like you are describing.

It sounds like your car's transmission is having problems. It could be something like a bad shift solenoid. Or your gears higher than 3 could be sheered off. But it's definitely not limp home mode like the OP posted.
 

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Mazda 6s 2006 stuck in 3rd gear

My wifes 2006 mazda 6s is doing something similar. She was heading home from work when she came to a stop light. As she came to a stop the car slammed down into 3rd gear and remained there as she tried to drive away. I drove over to where she was and drove the car to the nearest autozone. the check engine and traction control lights kicked on. The guy at autozone couldnt pull a code from the car. As I drove away the car ran fine from first gear to sixth. When I pulled up to a stop light the car slammed back down into 3rd gear and would not shift out of it. I put it back in park and then back into gear. I was stuck in 3rd. I drove less than a mile back to our place. While I was driving it back to our place, I would press the gas and the car would make a loud grinding noise from underneath. I checked the fluids and all seemed to be okay except for the level of the coolant (the housing has a small crack). Like I said before it will run through all the gears fine from a cold start but once it warms up it slams back down into 3rd gear.
 

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Mazda 6s 2006 stuck in 3rd gear

My wifes 2006 mazda 6s is doing something similar. She was heading home from work when she came to a stop light. As she came to a stop the car slammed down into 3rd gear and remained there as she tried to drive away. I drove over to where she was and drove the car to the nearest autozone. the check engine and traction control lights kicked on. The guy at autozone couldnt pull a code from the car. As I drove away the car ran fine from first gear to sixth. When I pulled up to a stop light the car slammed back down into 3rd gear and would not shift out of it. I put it back in park and then back into gear. I was stuck in 3rd. I drove less than a mile back to our place. While I was driving it back to our place, I would press the gas and the car would make a loud grinding noise from underneath. I checked the fluids and all seemed to be okay except for the level of the coolant (the housing has a small crack). Like I said before it will run through all the gears fine from a cold start but once it warms up it slams back down into 3rd gear.
Did you ever diagnose this issue?
 
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