[BlownBirdy]

Hey All,
When I am not tooling around in the fire chicken, my daily driver is a 99 BMW 328ic convertible with an auto tranny. On the way home from work today I got a P0740 code from the check engine light. The code translates to a Torque Converter Circuit Malfunction/shift solenoid Valve "A" problem. No slipping, hesitation, etc., etc. Car runs and drives like new (72000 miles).

Anyway, I did some research today and found that this is not a big deal and most of the time can be cleared by changing the tranny fluid. Just wondered if anybody else has ever dealt with a similar or identical code on any car and how it was rendered. Hate to take it back to those crooks at the dealer if i know i can fix it myself. Thanks guys.

 

[Ghetto Jet]

You say the code will usual clear by changing the transmission fluid, I would just change the fluid and see what happens.

 

[airworld2]

bmw

trans. should be a 4l30e can be solenoid in pan, can be replaced with out alot of trouble

 

[coco56k]

same thing

i have a 528i and im getting the same code p0740 the light comes on then goes off on its own for a while. the guy at the tranny shop tells me im gonna have to change the torque converter / clutch or somethin its drivin me nutz. let me know how you make out or any other suggestions besides the fluid changing.

 

[Chazmac]

P0740 is a solenoid PERFORMANCE code!!
This means the computer is not seeing a RPM drop when the TCC solenoid is commanded on because the TCC is not holding. Driving a car with a malfunctioning TCC apply WILL MELT the trans. This MAY be a valve body, pump or torque converter problem. Fluid changes will not solve this issue. P0740 indicates that the solenoid functions, but there is no subsequent transmission mechanical change...
Hurry.