![]() ![]() The 4l60e TCM is a specific module for Chevy, located towards the rear of the transmission case, right behind the cover. 4l60e Transmission Control Module Location You’ll find a fairly large, metal housing of the transmission control module bolted onto the body, with a large connector cable attached to it. Lift the hood up and take a look at the area on the driver’s side of the engine bay, just beneath the windshield. ![]() The location of the transmission control module varies between different Chevy models, but on most, it will be located in an easy-to-reach spot. How to Locate the Transmission Control Module When your transmission reaches this stage, it’s imperative that you diagnose and fix the issue, otherwise you’ll put yourself and the vehicle at risk. The symptom presents itself mostly on the upshifts, but it’s also possible for it to happen on downshifts, which would cause the engine to stall. The transmission may go up a couple of gears normally, only to fail to shift further, even when the RPM is high. The most serious symptom of the transmission control module is failing to shift gears. The symptom may also be caused by the transmission itself, but if you cannot scan, at the very least you can reset the TCM before conducting further investigation. Your Chevy would accelerate normally, but when it’s time to shift gears, it would cause a power delay and a jerk as the gear falls in place. Hard shifts are an unmistakable symptom of a faulty transmission control module. The scanner will tell you exactly what the issue is, but if it only gives you a code, keep an eye out for P0631, P0700 and P0706 as these are some of the codes related to TCM problems. The error code can be read directly off the center dash touchscreen on the modern vehicles, but for anything older you’ll need an OBD2 scanner to determine the exact problem. Often, it will appear before the real symptoms, so you can preemptively address the problem. The check engine light or the check transmission light is the early sign of transmission control module issues. By knowing how these symptoms present themselves, it is going to be a lot easier to tell when the TCM needs to be reset or changed. The transmission control module failure is always accompanied by one or more symptoms. 3 Symptoms of a Bad Transmission Control Module ![]() On older transmission systems, this is not the case, and the driver must manually shift the gear lever into “ 3” or “ L” gear to prevent unnecessary shifts. The transmission control module should take into consideration uphill and downhill driving and adjust the gears to those situations. When you step on the gas hard, the kick-down will make the transmission downshift to give you more power, but otherwise, the gear shifts are oriented towards an economical ride. ![]() The TCM takes into consideration the current RPM, speed, and load placed on the vehicle, so it can accurately shift gears at the most optimal moment. The transmission control module (TCM) is a chip that works with other components to determine when the automatic transmission should switch gears. Disconnecting and reconnecting the TCM is simple and requires no tools – just operate the built-in lever. It’s located on the driver’s side of the engine bay, right below the windshield. To reset the transmission control module in a Chevy, you must disconnect it for 10 to 30 minutes. Before you do that, you should first try resetting it and checking if that solved the problem. If your Chevy is suffering from erratic shifting or failure to change gears, it might be time to change the TCM. The transmission control module, otherwise known as the transmission shift solenoid is a part of the system that controls shift points on an automatic transmission. ![]()
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