If a torque converter is defective, what symptom may be observed?

A defective torque converter can lead to sluggish acceleration at low speeds due to its crucial role in transferring engine power to the transmission. The torque converter uses fluid to multiply engine torque and manage the interaction between the engine and transmission, particularly during initial acceleration. If it is malfunctioning, it may not effectively transfer the necessary force to propel the vehicle forward smoothly, resulting in a noticeable lag in responsiveness during acceleration. This symptom is often described as a lack of power or a feeling of the vehicle struggling to move, especially when starting from a stop or at low speeds.

While other symptoms like overheating of the transmission, increased engine noise, and unresponsive gear shifts may also indicate issues within the transmission system, sluggish acceleration directly correlates with the torque converter's failure to function properly in delivering power. This makes it a key indicator when diagnosing torque converter problems.