PNDB Electrical Power Distribution

On April 23, 2018, the Office of Defects Investigation (ODI) opened this Preliminary Evaluation (PE18-004) to investigate certain alleged defects affecting the Powernet Distribution Box (PNDB) and associated wiring on certain model year (MY) 2011-2016 Freightliner Cascadia (P3 platform) truck tractors that may result in disruption or loss of electrical power to the PNDB itself and other electrical circuits, thermal events, and/or vehicle fires. On May 7, 2018, ODI sent an Information Request (IR) letter to Daimler Trucks North America LLC (DTNA). On June 19, 2018, ODI received an IR response from DTNA that included vehicle production, consumer complaint, field report, warranty, manufacturer actions, changes and other data related to the alleged defects. On April 8, 2019, ODI received a supplemental IR response from DTNA that included their assessment of the alleged defects. Furthermore, ODI engaged in discussions with the manufacturer about the alleged defects on multiple occasions during the course of this investigation. ODI analysis of all available data indicates there is not an apparent defect trend. The most recent field report data reviewed was from 2017Q1 and the most recent complaint data was received by ODI in 2019Q1. The complaint rate is low. Most warranty claims occurred early in the vehicles' service life, and with the newest of the subject vehicles being over four years old, they are all now beyond that point. The warranty claim rates for loose input or output terminals (0.16%), loose fuses (0.25%), PNDB power (B+) supply cable corrosion or improper PNDB power (B+) supply cable routing and/ or securement (0.00%) are all low. The most serious consequence in the warranty claim data alleged engine shutoff with a vehicle in motion. While some vehicles did experience a loss of electrical power resulting in loss of motive power with no immediate restart capability, the bulk of the warranty claims were for vehicles equipped with an optional cab power disconne