There is a possibility that it could be a sensor. There is also a possibility of a bad brake light switch. The computer locks the converter when it sees the correct conditions. It will immediately unlock the converter when you either touch the brake (enough to light the lights) or lift your foot off the gas pedal. This is to prevent the "chucking" that you would get if it stayed locked like a stick shift. Also, there is a common problem that comes up on the 4L60 and 4L65 transmissions. They use steel check balls in the valve body. As mileage accumulates, they beat their way into and finally through the separator plate. Every one that I have rebuilt has failed at least in part because of check balls either stuck in the separator plate or have beat their way through the plate. There is also the possibility of a weak lockup solenoid.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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