There is a 41st Engineer Battalion but they were not in WWII as the 41st. The 126th Engineer Mountain Battalion, an element of the 10th Mountain Division, was inactivated on 21 November 1945.The Battalion was redesignated as the 41st Engineer Battalion and activated on 1 July 1948, at Fort Riley, Kansas with the 10th Infantry Division.
Info from: http://www.globalsecurity.org/military/agency/army/41eng.htm
"The 41st Engineer Battalion was originally constituted as the 126th Engineer Mountain Battalion and activated on 14 September 1942, at Camp Carson, Colorado. The mission of the 126th was to operate in mountainous terrain constructing tramways, cableways, suspension bridges, and mule trails.
The 126th Engineer Mountain Battalion was assigned as an element of the 10th Light Division, later designated the 10th Mountain Division. The Battalion played an active role in the Division's successful offensive in the North Apennines and Po River Valley Campaigns, which broke the Germans seemingly impregnable Gothic line. The 126th Engineer Mountain Battalion was inactivated on 21 November 1945. The Battalion was redesignated as the 41st Engineer Battalion and activated on 1 July 1948, at Fort Riley, Kansas with the 10th Infantry Division. The Battalion was inactivated on 14 June 1958, at Fort Benning, Georgia.
On 2 September 1985, the 41st Engineer Battalion was activated at Fort Drum, New York, home of the 10th Mountain Division (Light Infantry). The 41st Engineer Battalion "Sappers" provided combat engineer support to the maneuver brigades of the 10th Mountain Division, as well as the Division Support Command, Division Artillery, and the Combat Aviation Brigade."