Signs of a Bad Transmission Control Module

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The inside of your vehicle is composed of thousands of intricate parts all working together to safely move you down the roads of Panama City, Springfield, and Callaway. One of these small but vitally important parts is the transmission control module.

Knowing when this device needs to be replaced not only can help you avoid costly repairs but potentially save you from a serious accident. In this helpful guide, the service team at Honda of Bay County will illustrate the key signs of a bad transmission control module and the steps to take to avoid a breakdown.

3 Signs of a Bad Transmission Control Module

Picking up the signs of a bad transmission control module is relatively simple to do if you know what to look out for and the common symptoms. A few of the most common signs include:

  • Gear Slippage: If while traveling down the road your vehicle unexpectedly shifts into neutral or suddenly upshifts, it might be a sign that your TCM is failing.
  • Delayed Acceleration: When pressing down on the gas pedal you notice a slight delay in acceleration or your vehicle is slow to upshift while traveling uphill.
  • Unable to Shift: While parked or at a stop, you find yourself unable to shift out of neutral or into any gear, your TCM may be broken and need to be replaced.
  • Downshifting Slowly: When coming to a full stop, you notice that your vehicle is slow to downshift from normal traveling speed.


The moment one or more of these signs appear, immediately schedule a service appointment to have it inspected by a trained professional. Ignoring the issue can result in not only a serious accident or injury but cause further damage to your vehicle’s internal system. A broken transmission is often highly expensive as well as be a major hindrance to your everyday life.

What is a Transmission Control Module?

If you’re like the vast majority of American drivers, you most likely drive a vehicle that uses an automatic transmission. In order to consistently transfer the right amount of energy from your engine to its wheels, a transmission control module (TCM) is needed.

This small device located in the rear of the engine collects data from your throttle, turbine, and brake pedal sensors and then sends signals to the clutch in order to regulate the transmission’s gear shifts. Essentially, without this tiny computer your vehicle can’t properly shift or make necessary changes to the engine’s fuel usage.

Need Help with Your Transmission Control Module?

If you’re currently experiencing any of the issues we listed above, the team at Honda of Bay County Service Center is here to help. Dedicated to providing honest and thorough care over the life of your vehicle, the can quickly diagnose any issue your vehicle is facing and get you back on the roads of Panama City, Springfield, and Callaway in no time.

To get started, simply stop by our convenient location during service hours or go online to schedule an appointment that best fits your schedule today!