My 2004 bmw 325 is series 3 keeps going into limp mode .I recently had my transmission fluid changed and also had a motor oil change . My car...

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Hello Victoria

How are you doing? While limp mode could be considered a catch-all symptom that may indicate many different issues, the most common causes of limp mode are: Faulty engine elements, including sensors and wiring. Excessive or reduced engine boost control. Faulty transmission, including ineffective wiring.

These things must be diagnosed physically by a professional mechanic for they have also an OBD II scanner to check the fault and the parts that will require replacement.

But here's a thing before bringing it in to a mechanic. Try to remove the negative battery connector and let it sit for 10 minutes before reconnecting it. This will reset the system and may get rid off the limp mode. But if to no avail please bring it in to your trusted mechanic for a physical check up. Hope this helps. I'll be standing by for your response.

Thank you

Relly

Sure thing no problem Victoria. I'll wait here. Thank you

Ok... this will mean a lot of things like ABS or fluid sticking together but you just had it changed right?

It's possible that they did not. They should have used a dialysis machine. Getting the old fluid out and putting the new fluid in. I strongly suggest that you replace the filter as well. 

By the way... did you try removing the negative battery connector to try the reset. You will need to drive it around the block a couple of times 

Alrighty... I'll be standing by for your response. Crossing my fingers on the reset  for if they did flushed the fluid and fill it in with the new one properly we will be facing a tranny rebuild. My advice is try to have a fluid change on a different proper shop that has a dialysis machine for this may resolve the problem and get rid of the thinking that the first shop made a poor job.

I'll be right here waiting after the reset

Yes they should replace the filter for this may accumulate gunk

Any update?

Alrighty ... I'll be standing by. Thank you

Alright. Let's hope for the best

Code P0374  trouble code indicates that an abnormality has been detected in the gear ration of one of the automatic transmissions gears, causing the storage of a code in the Powertrain Control Module (PCM) and illumination of the Check Engine Light. 

This code can indicate an internal problem in the transmission/gearbox itself. This can indicate that one of the transmission/gearbox components is slipping internally.

What will have to be done is to have the gearbox removed and inspected to see if it can be replaced or if it has to be repaired. Usually friction plates replacement will be required

Any history of transmission rebuild on this car from the past?

Alrighty then. Looks like that it has reached the end of it's service life

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