Truck Crashes: Why ECM Data and Driver Logs Disappear—And What Preservation Letters Do

After a serious commercial motor vehicle collision, defense teams often focus on what was recorded—and what never made it into the file. Electronic control module (ECM) snapshots, driver qualification files, and maintenance histories are not academic details; they can illuminate fatigue, maintenance culture, and corporate oversight.

Spoliation is not always dramatic shredding. Sometimes it is delayed downloads, ‘routine’ overwriting, or ambiguous retention policies. That is why attorneys send targeted preservation communications when litigation is reasonably anticipated.

This article is educational only. Your collision may involve different vehicles, jurisdictions, and evidence types. Counsel should evaluate chain-of-custody and admissibility questions for your specific facts.