Fixing Your 4l60e Transmission Limp Mode
If your truck suddenly feels like it's stuck in second gear and won't shift, you're likely dealing with 4l60e transmission limp mode. It's one of those things that can turn a normal drive into a stressful afternoon in about two seconds. Basically, your truck's computer (the PCM) has decided that something is wrong enough to warrant "protecting" the transmission, so it limits you to one or two gears—usually second or third—to make sure you don't completely shred the internal components. ...