Electrical components under front carpet may be damaged when cleaning van interior on GMC Savana 3500

Various electrical components under the front carpet/rubber mat may become damaged if excess water is used to clean the rear cargo area.
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Average mileage: 250,000 (250,000–250,000)
15 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
16 people reported this problem
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problem details
Purchased a 2002 Savana 3500 cargo van. It was used for construction so I pressure washed all the floors. The next day it would not start. It is presently stranded at our cabin some distance out of town. What and were are the culprits?