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X5 E53 (1999 - 2006)
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  #1  
Old 08-05-2013, 07:10 PM
DCUSCG DCUSCG is offline
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Transmission LT caused by thermo?

Hello all...

My wifes 2001 x5 3.0l is having some issues...

At initial start up seems to run fine until about 20 minutes in...the check engine light seems like it has been on for years for whatever reason.. but now the transmission gear looking light is coming on after the car reaches temp... we have had the engine codes ran and it comes back with a thermostat code... my wife took to a bmw specialist and they plugged into the transmission computer to try and read code but the light was not on at the time and of course no codes, ( BTW i am stationed on the complete other side of the states) the mechanic has told her to replace the thermostat and the transmission light should go away...

I guess once the trans light comes on the car is slipping thru 1st and 2nd and doesnt want to shift into 3rd.... some of the times the light will turn back off and car will run fine...

car has 130k miles on it and doesnt get driven hard.

does this sound familiar? is there more to replacing the thermo on this car or just straight forward? thanks in advance
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  #2  
Old 08-06-2013, 06:58 AM
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Scott ZHP Scott ZHP is online now
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Sounds strange to me.

P0128 is normally the generic ODBII code thrown for a bad engine thermostat. It normally fails open, not closed. The trans cooler has it's own thermostat located in the bottom of the expansion tank. The trans cooler is mechanical and will not throw any codes itself.

What you want is an Indy shop that specializes in BMW to read the codes using a Peake scan tool or equivalent. Once thrown, codes dont disappear until they're cleared.
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  #3  
Old 08-06-2013, 07:26 PM
DCUSCG DCUSCG is offline
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Transmission LT caused by thermo?

I have also been told that we should definitely replace the water pump as this could be what is wrong with it?

So now I have been told many different things... Replace the thermo and housing, water pump and take to dealer to get trans code read

She was told she needs to stop driving right away and get it I to the shop...

Any advice as to what to do first?


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  #4  
Old 08-07-2013, 08:01 AM
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Scott ZHP Scott ZHP is online now
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Do you know the maintenance history of this X5? How long have you owned it? If the water pump and the thermostat are original, I'd replace both along with the expansion tank/cap and both drive belts at a minimum. By 130k miles, both tensioners are likely in need of replacement as well.

I can't think of any real relationship between the engine thermostat/water pump and the auto transmission. As mentioned, there is a seperate mechanical thermostat for the transmission cooler located in the bottom of the expansion tank. Its possible that this has failed and isn't routing coolant through the heat exchanger to cool the transmission fluid. They are normally failsafe and fail OPEN, not closed.

It's difficult to diagnose without specific codes; preferably the BMW code-set as read by a Peake scan tool, or the like. The generic ODBII powertrain codes (like Pnnnn) are or limited use in diagnosing issues.
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JUST...LOOK...UNDER...THE...CAR....for Chrissakes....it`s like checking to see if a dog is male or female....
Quote:
Originally Posted by smolck View Post
A bimmer with forced induction should have a proper manual gearbox. Anything less is like french kissing your sister.
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  #5  
Old 08-26-2013, 06:49 PM
DCUSCG DCUSCG is offline
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Transmission LT caused by thermo?

Ok so we have replaced the thermo and the water pump. Upon replacing water pump noticed the impeller was busted into two... Anyway last winter I remembered that the hot air did not work unless at idle... Low and behold the hot air STILL doesn't work! Also the transmission light is still coming on unless at higher speeds or on a cooler day.... I'm stuck!


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  #6  
Old 08-26-2013, 07:57 PM
puddinboo puddinboo is offline
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Originally Posted by DCUSCG View Post
Ok so we have replaced the thermo and the water pump. Upon replacing water pump noticed the impeller was busted into two... Anyway last winter I remembered that the hot air did not work unless at idle... Low and behold the hot air STILL doesn't work! Also the transmission light is still coming on unless at higher speeds or on a cooler day.... I'm stuck!


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when your transmission light comes on does it go into safe mode (can`t drive faster than 80km/hr?
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  #7  
Old 08-27-2013, 01:28 AM
X5DARKNESS X5DARKNESS is offline
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i think you said the transmission dont Change from 1st to 2nd and to 3ed if this Happens with you, so >> i think you need to check the transmission oil it seems need to Change, it important thing,and the reason :

- The Transmission oil works to easier the change between the 1st, 2nd, 3ed ... etc.
- Also works on cooling the transmission and this may be caused by the emergence of light transmission

With time Chemical properties of the oil changed, because of the heat and frequent use,so becomes zero viscosity,I advise you to focus on this point
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  #8  
Old 09-02-2013, 06:22 AM
DCUSCG DCUSCG is offline
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Transmission LT caused by thermo?

Thanks for the replies, so my wife is taking the car into a BMW mechanic tomorrow to get the codes read. The same mechanic who last year replaced the o2 censor and ended up not doing anything then re flashing the computer to fix the problem at the time...
So she took it to autozone right now it is showing a o2 censor code. It is still shifting bad and transmission light is coming on, since yesterday when the car is at idle or at a stop light it will just die. Lose all lower then wait a sec and it fires back up. ( same problem we had last year) it seems like one thing after another with this car. As of right now we have a shopping list of problems... Passenger door handle doesn't work(exterior), heater doesn't work, trans light, shifts like ****, o2 censor (again!) and it just dies at idle, ripped cv boot and loose control arm.... Can't wait to take leave and fix it all like usual!!!


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  #9  
Old 09-26-2013, 04:03 PM
DCUSCG DCUSCG is offline
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Mein Auto: 2001 x5 3.0l
Transmission LT caused by thermo?

Ok so my wife just took the car to a dealership specializing in BMW... They are saying the trans is leaking.... She says it has been running really good now that it's getting colder out.... They said it is leaking and they can either flush it and refill it ( not fixing the leak) for 400$ or they can replace the trans..... Shouldn't there be a few more options? I'm on the other side of the country so it's hard for me to look at it!


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  #10  
Old 09-26-2013, 04:48 PM
puddinboo puddinboo is offline
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I think I would take to a tranny shop for a second opinion usually dealerships only r&r parts .
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