NHTSA Investigation PE11031

Pass-Through Power Stud Corrosion

ODI received a complaint regarding a corroded battery post located behind a service panel near the driver's seat on a 2006 Thomas Built C2 school bus that resulted in a fire on the vehicle.It was determined that like buses built prior to a December 26, 2005 design change which added a flange to the lower edge of the panel were susceptible to water intrusion.The design change was meant to address concerns of loose panels but consequently prevented water ingress and the subject corrosion. Daimler Trucks North America (DTNA) submitted a recall notice on October 18, 2011 involving 3,300 of the estimated 6,139 vehicles subject to this investigation.In subsequent communication with ODI, DTNA explained that nearly two thirds of 4,773 MY2007 vehicles were built with the December 26 design change and therefore do not contain the safety related defect.DTNA's announcement of a safety recall on this matter, and subsequent explanation of the scope of vehicles involved, addresses ODI's concerns.The 573 letter was received prior to the due date of the IR response, therefore DTNA has been relieved from having to submit an IR response.DTNA will inspect, clean, repair and protect power cables as needed.The subject vehicles have been recalled and this investigation is closed.The ODI report cited above can be reviewed at www-odi.nhtsa.dot.gov/owners/SearchNHTSAID under the following identification (ODI) number: 10395455

An investigation is a separate record from a recall and from a manufacturer communication. A manufacturer campaign to repair a safety defect or a failure to meet a federal safety standard.