Toyota is recalling 1.9 million of its Prius cars worldwide.
That is being done to fix a programming problem in the hybrid systems, which could cause vehicles to lose power or even stop altogether.
Most of the recalls are in Japan and North America.
It is the third recall for the current Prius, which has been on sale for five years.
Last June there were brake system problems.
The Prius is one of Toyota’s best-selling models and has become synonymous with the fuel-saving hybrid technology.
A Toyota spokeswoman said no accidents have been reported related to the latest defect.
Toyota, the world’s top-selling car maker, has not disclosed cost estimates for the recalls.