Chrysler - Sebring :: 2002 - Check Engine Light Came Driving Down The Highway At About 70 MPH

I drive a 2002 Chrysler Sebring convertible with about 130,000 miles on it.

I was driving down the highway in early November when the check engine light came on my car. I took it to Aamco who did some diagnosis and replaced a solenoid assembly in the transmission. The light went off and I was on my way. I never got the exact code.

About a month after that, the light came on again. This time, I got a low end code reader and scanned it myself. I got a "P0700" code, which I've read is a generic code that the transmission system sends to the computer or something. So I used my reader to erase it. However, the light came on 2 days later while I was driving down the highway at about 70 MPH.

So I went to an auto parts store to get a more detailed scan with a better tool. This one came up "P0740 Torque Converter Clutch Solenoid Circuit".

This feels weird, because the solenoid assembly was just replaced a month ago (and is still under warranty).

The car seems to drive okay. I don't notice any actual problems in shifting. The tachometer seemed to get up to about 3000 RPM on the highway. But I've seen practically new cars do that. The last time I had serious transmission problem it would rev up to about 5000 or 6000 RPM on the highway and still only getting up to about 40 MPH. That was 3 years ago and at the time I had a fairly expensive transmission repair (which included a new torque converter).

But like I said, the car seems to be driving okay. I don't drive much. Maybe 100 miles a week? And even that is mostly optional in town driving. I'm not looking to keep this car for more than another 20,000 to 25,000 miles though for the time being I cannot afford a new one.

What are the possible causes here? What are the consequences of ignoring this? Like I said, it's still driving fine and as the old saying goes "if it's not broke, don't fix it".