Statistics Canada says total manufacturing sales fell 1.2% to $70.8 billion in November, weighed down by a decline in the auto sector.
The agency says sales of motor vehicles fell 15.9%, while the motor vehicle parts group dropped 6.3%. The machinery subsector lost 3.2%.
The declines were partially offset by a 6.8% increase in sales of petroleum and coal products, helped by both higher prices and volumes.
In real terms, manufacturing sales fell 2.3% in November.
In a separate report, Statistics Canada says wholesale sales, excluding petroleum, petroleum products, and other hydrocarbons and excluding oilseed and grain, fell 1.8% in November to $84.4 billion.
Wholesale sales, excluding those same items, fell 2.3% in volume terms.