How Do I Know If My Tcc Solenoid Is Bad. There is a solenoid in your GM converter that causes the the torque convertor clutch TCC to engage and disengageWhen the TCC solenoid receives a signal from the engine control module ECM it opens a passage in the valve body and hydraulic fluid applies the TCC. If it detects a problem with one of the solenoids or the related circuits it will send a request to the engines computer to turn on the check engine light.
Your car will vibrate even when youre not going very fast. When the solenoid is open the engine is locked to the transmission so there is no transmission slip. This type of solenoid failure will set a Diagnostic Trouble Code causing the Check Engine Light to illuminate.
A bad transmission solenoid can result in the malfunctioning of the entire transmission system.
Another symptom of a failed TCC solenoid is a fault code. Erratic shifting or shift slippage. The shuddering makes the car lag and is very noticeable. Generally if you unplug the TCC solenoid at the transmission and the symptoms go away you have found the problem.
