ODBII Error - "P0743 Torque Converter Clutch Circuit Electrical"

I'm assuming you have the 5R55E transmission.... Depending on the failure, P0743 "may" be benign and simply cost you extra at the pumps..... or it could have the TCC not releasing when it needs to - continued driving may be just getting the thing closer to catastrophic failure and a bigger hit to the wallet (let alone the inconvenience and extra cost of any "unscheduled" breakdown - perhaps coming at a time when one can least afford the finacial aspect or when one is running very late for something very important).

When the lamps illuminate, the TCM will go into a preprogrammed failure strategy... hence the rough feel when the lights are lit, smoothing out when you clear the codes. Continuing to clear the codes and drive may be the automotive equivalent of watching that big, leaking goober on an important body part get bigger without consulting a physician. These things never, ever "heal themselves" and usually only get worse with the passage of time and miles.....

In case you're wondering.... this code indicates that the PCM has not seen a voltage drop across the TCC solenoid (search "voltage divider circuits" for an understanding of the logic)..... This could indicate either an open in the wiring, an open in the solenoid or an intermittent short to ground in the solenoid control circuit.

Great information. I am going to do a few searches tomorrow on the Voltage Divider Circuits. It sounds like from what you say that the problem "could" be a poor connection somewhere. Wouldn't that be nice. I only wish it was warmer weather her in the DC area and I would take a longer look at it. Do you (or anyone) have any short cuts to where the wiring connections might be. I don't know if the wiring would be down under the vehicle near the transmission or near one of the transfer cases - that would be a big help to start.