* TCM Function: The TCM is the "brain" of your transmission. It controls shift points, torque converter lockup, and other crucial functions. A malfunctioning TCM can lead to a range of problems, from rough shifting and delayed engagement to complete transmission failure.
* Diagnosis is Crucial: Simply knowing the light is on for the TCM isn't enough. A professional mechanic needs to:
* Use a scan tool: This will read the specific trouble codes stored by the computer. These codes pinpoint the exact problem the TCM is reporting. Generic OBD-II readers might show a broad transmission issue, but a more sophisticated scan tool focusing on transmission systems is needed for accurate diagnosis.
* Inspect the TCM: They'll need to visually inspect the TCM for physical damage, loose connections, or corrosion.
* Test the TCM's electrical connections and wiring: Problems can stem from faulty wiring or connectors rather than the TCM itself.
* Perform transmission fluid and filter service: Low or contaminated fluid can sometimes cause issues that the TCM is trying to compensate for, leading to error codes. While this may not fix a faulty TCM, it's a crucial step to rule out.
* Possible Solutions (determined by the diagnosis):
* TCM Replacement: The most likely solution if the TCM is faulty. This is usually an expensive repair.
* Wiring Repair: If wiring is damaged or corroded.
* Software Update: In some cases, a software update for the TCM may resolve the problem. This is less common but possible.
* Sensor Replacement: A faulty sensor (e.g., speed sensor) could be sending incorrect information to the TCM, causing it to malfunction.
* Ignoring the Problem: Continuing to drive with a faulty TCM significantly increases the risk of more extensive and costly transmission damage. You could experience complete transmission failure, leaving you stranded.
What you should do:
1. Don't ignore the check engine light.
2. Take your Intrepid to a reputable mechanic specializing in transmissions. Explain the specific code related to the TCM if you have it.
3. Get a proper diagnosis and several repair estimates before proceeding. This will help you make an informed decision about the repair.
In short, a TCM issue is serious and requires prompt attention from a qualified mechanic to prevent further transmission problems and potentially save you a lot of money in the long run.
