I just got back one of my Volts from the shop, after showing codes P0128 and P2181. These codes correspond to engine coolant too cold, and faulty thermostat. Running fine now with a new thermostat.
The strange thing is that when it happened with my wife driving, she reported seeing a message first that said the system was turning off AC due to engine temperature. Onstar checked and said that engine temp was not too hot. A few minutes later when she restarted the car, the display switched a few times between battery and ICE display.
Anyone seen these kind of glitches?
Volt 1: White 2012 #4038 “VOLT EDG”
Volt 2: Crystal Red 2012 # 15079 “ONE VOLT”