The four recalls cover nearly 430,000 vehicles. More than 400,000 2014 to 2015 Silverado, Sierra, Yukon, Tahoe, and Subarban are coming back due to faulty software. Also on the list are a few thousand Caprice model police cars with defective wipers.
No injuries or crashes have been reported from this latest recall.
In all, this brings the company total for the year to 48 recalls, covering more than 20 million cars.