Check engine light, ETC warning light come on; temp gauge drops to 0; why? on 2009 Jeep Grand Cherokee

Problem seems to cycle - driving along, suddenly the check engine light comes on along with the electronic throttle control warning light, as the temp gauge drops to zero - which triggers the Check Gauges warning light to come on. Drive more, stop a few times, ETC light goes off, temp gauge starts working again. Check engine light stays on for a while, then goes off. Some miles/hours later, cycle repeats. No indication of trouble in engine behavior, sound, etc. Tried replacing gas cap (2x). Dealer replaced thermostat. Still going on. Any ideas?

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