Buy a can of electrical switch cleaner and spray both the male and female connectors on all those items involved.
If that doesn't fix it, you need an auto electrician with a pro grade scan tool computer who can scan for communication issues and record the Live Data as it happens and what made the electronic throttle indicator light come on.
https://dashboardsymbols.com/2010/11/electronic-throttle-control/
Electronic Throttle Control Indicator
This is the
Electronic Throttle Control (ETC) Indicator symbol. This light, a lightning bolt between reversed brackets or parenthesis, will illuminate if there is a problem in the electronic throttle control system. As an electronic system, it can sometimes be reset with a restart.
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