Standard ECU qualification testing validates against fixed accelerated humidity and thermal profiles, but electrochemical migration – a documented cause of dendritic short circuits in PCBs – often develops under slower, cumulative moisture exposure that those profiles don't replicate. This session examines that test-coverage gap using real-world automotive failure literature and field reliability methodology: how climate-correlated field data can surface ECM risk testing alone misses; how root-cause findings drive both hardware corrective actions and software-side OTA containment for fleets already deployed; and what shift-left changes – specific test profile and coverage criteria – are needed to close the gap.

• Why electrochemical migration causes dendritic ECU failures even when components pass standard humidity and thermal qualification testing
• How accelerated test profiles can miss the slow, cumulative moisture exposure that drives real-world dendrite growth in the field
• A method for using regional and climate-correlated service data to surface electrochemical migration risk before it becomes a field failure
• How root-cause findings on hardware failures translate into software-side OTA containment for vehicles already deployed in the fleet
• Specific shift-left changes to test coverage and validation criteria that close the gap between qualification testing and field reality