What Are the Symptoms of a Faulty Transmission Oil Pump?
2 Answers
Transmission oil pump failure symptoms: 1. The oil pump cannot generate pressure, resulting in slipping or inability to drive; 2. It causes noise, produces excessive iron powder, and leads to oil circuit plate jamming. It is recommended that the owner address the issue promptly. There are two oil pumps in the transmission: internal gear-type oil pumps. Both pumps are installed within one assembly, separated by a partition, and operate at the same speed as the engine. The main oil pump supplies oil to the entire system, while the return oil pump is only responsible for pumping the oil from the torque converter oil pan back to the transmission oil pan, requiring no pressure. The principle of the oil pump is to supply oil to the transmission and maintain sufficient compensation pressure and flow to ensure the hydraulic components can perform their power transmission function.
My old car had transmission issues, and the symptoms were quite noticeable when the oil pump failed. The shifting felt rough, almost like it was stuck, especially when accelerating—the car responded sluggishly and sometimes made strange noises, like metal grinding. The dashboard warning light would suddenly come on, alerting me to check the transmission system. I suspected the oil pump failure caused insufficient lubrication and low pressure, throwing the entire drivetrain into chaos. Later, I also found oil leaking underneath the car, and upon inspection, it turned out to be transmission fluid seeping out. I rushed to get it fixed—delaying repairs could have damaged the entire transmission, making replacement much more expensive. I advise car owners to change their transmission fluid regularly and not wait until problems arise. Paying attention to these warning signs while driving can save a lot of money.
