At a glance
What can fail
Some vehicles have wrong turn signal modules installed. This causes LED turn signals to flash irregularly when hazard lights are on. If a front or rear turn signal burns out, the remaining signals won't flash faster to alert you, so other drivers may not see your turn intentions.
What the fix does
Dealers will replace the turn signal modules with correct ones.
Summarized — see the official notice for exact wording, dates, and contacts.