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PO743 & PO741 Need info on these

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Posted by: Nick

Check engine light came on and display read "check transmission" Had a friend scan it with a snap on scanner and it said TCC solenoid failure or lose of signal. TCC=torque converter control. The torque converter is definately locking up on the interstate properly. We cleared it and it came right back on. Transmission shifts fine. Any experience with this? I called the dealer and asked them for the part that came up in the code and he said it was part of the valve body..which didn't make much sense to me....any suggestions?

Posted by: eL eS

What year and engine do you have?

Posted by: eL eS

I have read the test/diagprocedure for the P0743 and it does result in replacing the solenoid body. Having been through four replacements I can honestly say that mine never threw any codes which would make me suspect a sensor is not reading properly or that there is an electrical problem. Plus my LS had driveability problems which you stated yours is not.

Not know the year makes it tough becasue there we problems early on with the LS early 00 to 01. So you might have a bad vehicle speed sensor, VSS. Have you had any work done under the car recently?

Posted by: Nick

Car is a 2000 made 05/00. Has the 8. There is not any driveability issues that i can tell. I have driven on city streets and highways and no difference than when the lights where off. Why would u suspect a speed sensor? If one of those were bad, would a code particuliarly for that pop up?

Posted by: eL eS

Quote:

Originally Posted by Nick

Car is a 2000 made 05/00. Has the 8. There is not any driveability issues that i can tell. I have driven on city streets and highways and no difference than when the lights where off. Why would u suspect a speed sensor? If one of those were bad, would a code particuliarly for that pop up?

do you notice any delay or kick when you shift to reverse? Well if there is no noticable drivability problems my next thought is what could casue a fault and that would be a sensor that measures the time and location of events. The vehicle speed sensor seems to be the most logical at this point unless there are drivability issues that are undetectable.

The year and build date seems to fit with the transmissions that typically experice the solenoid pack and valve body problem. Have you changed the O2 sensors or had a tranny flush recently or any work that would require access to the under side of the car?

Could be a loose cable or dirty connector. Judging from the pinpoint troubleshoot procedures it is either a bad connection, bad sensor or bad component. The OBDII code can only get us so far then you have to start doing a physical diagnosis.