At a glance
What can fail
Foam lining inside the Engine Control Module box releases sulphur gas as it cures. If a resistor inside has a surface crack, the gas corrodes it, potentially causing the check engine light to turn on, rough idling, weak acceleration, or unexpected engine shutdown while driving.
What the fix does
The dealer removes the foam lining material from inside the Engine Control Module box.
Summarized — see the official notice for exact wording, dates, and contacts.