Getting your hands on a vehicle-specific service manual is the best way to confirm where it’s mounted but searching online for your vehicle’s year, make, and model will also get you there. But an Allison T87 transmission would have its TCM located by the driver’s side battery on the fan shroud.ĭon’t start taking things apart trying to guess where it might be. Sometimes it’s found under the center console in the interior, under the dash by the firewall, under the hood near the battery, inner fender panel, or even the glovebox.įor example, the TCM of Chevy’s 4L60E transmission is normally found near the back of the transmission case (right under the cover). It should be just below the engine control module’s position. The TCM can often be found below the cover at the back of the transmission case. Its exact location will vary from one vehicle to the next. If you don’t know where to find the transmission control module, don’t worry, you’re not alone. See Also: PCM vs ECU vs ECM vs TCM (What’s the Difference?) Where is the TCM Located? In short, the TCM is continuously working behind the scenes to deliver a smooth driving experience with optimal fuel efficiency.Ī car or truck’s TCM will likely never need replacing, but if you have a bad transmission control module, immediate replacement (or repair) is necessary. This information is used to calculate the optimal timing and gear shifting required for your car. The TCM interprets and processes data received from components such as the throttle position sensor, vehicle speed sensor, and engine load. Think of the TCM as the brain of your transmission it communicates with various sensors and components to ensure that your vehicle shifts gears smoothly and efficiently. Rather than relying on hydraulic or mechanical control over a transmission system, newer vehicles use a transmission control module instead. The transmission control module (TCM) is a vital component of any vehicle with an automatic transmission system. #3 – Problems Shifting Into Higher Gears.#1 – Check Engine or Transmission Light.Signs of a Bad Transmission Control Module.
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