Check engine light code P0741 on all the time. Changed torque converter, . Help

They were ! Trial and error mechanics at my expense! Where would I obtain these troubleshooting routines?

The engine stalling when engaging drive (no problem with reverse) started after changing the torque converter with a new one. Now as the weather gets colder, I need to run the engine for several minutes to warm it up before engaging drive. I will try to find a mechanic who has the full scan tools to check the transmission when running, although I not previous comments where it was clearly stated that "the transmission will never have to be replaced as a result of the check engine light being on".

I can surely state that the last quote is wholly inaccurate. However, no need to rush to judgement here. Proper methodical diagnostic steps yield accurate results.

What exactly should they be looking for during this test drive? I am reluctant to believe anything from "my" mechanic and would like to be informed about what is happening

A professional quality scan tool can monitor transmission control systems and display transmission activity on live data screen .. This includes shift control solenoids and many other very useful diagnostic segments while vehicle is in service bay and being driven at highway speeds.. Additionally - an experienced transmission technician using this scan tool in the manor suggested is your best choice here.. There is absolutely no reason for unnecessary parts replacement - that will be eminent with guesswork.. Good luck with it!

I had a full scan whilst driving today. The results show a perfect transmission with no faults apart from the original P0471 code !!! I note that the stalling problem when engaging drive only occurs when the check engine light is on. After each scan and cancelling the check engine light, the light stays off for a "period" of time. (varies !). When it comes back on, the engine stalls when engaging drive when the engine is cold.

The torque converter is remaining in *lockup mode* - that’ll kill the engine every time when transmission is shifted into gear! I can’t suggest any particular repair - however I do suggest more *hands-on* testing be performed to discover why the converter is not unlocking - possible converter control solenoid or solenoid circuitry.. You will probably need to leave your vehicle with an auto repair facility for a couple days so this can be tested while the engine / transmission is cold .. I will also note transmission fluid is more viscous while cold.. However it is likely the fluid will get replaced during the actual repair. Good luck!