What Are the Signs of a Bad Torque Converter?

A transmission torque converter is a very important part of a vehicle's transmission. Basically a giant pump, a torque converter ensures the proper flow of hydraulic transmission fluid throughout a vehicle's transmission. A bad torque converter can seriously disrupt both a vehicle's transmission function and engine power output.

Loss of Power

A bad torque converter will often times prevent a vehicle from developing sufficient power. Vehicle engine power is maximized only when the transmission, which includes the torque converter, is functioning properly. Any abnormality in the function of a vehicle's transmission, especially as the result of a bad or faulty torque converter, will result in a net loss of usable engine power.

Transmission Slippage

A transmission torque converter is responsible for pressurizing hydraulic transmission fluid and pumping it throughout a vehicle's transmission. Sufficient hydraulic fluid pressure is necessary to maintain proper transmission gear function. A faulty torque converter can cause transmission slippage by reducing the flow and pressure of hydraulic transmission fluid.

Torque Converter Noise

Many times a bad transmission torque converter will produce audible noises such as grinding or whistling-type sounds that are indicative of torque converter dysfunction. A noisy torque converter, even one that still functions properly, is likely to fail and/or become dysfunctional within a short period of time.

Abnormal Transmission Engagement

A transmission that fails to shift into gear quickly and efficiently, especially when shifted from park to drive, is normally the result of a bad or dysfunctional torque converter. A lack of torque converter pumping strength can result in slow, delayed transmission engagement.

Transmission Surging

Transmission surging is a condition where a vehicle's transmission alternates between periods of smooth, steady transmission function and brief, erratic periods of transmission jumping or lurching. This type of transmission function is normally the result of a torque converter that is losing its ability to deliver smooth, constant hydraulic fluid pumping action.