Conditions for Setting the DTC: P0117
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the ECT is greater than 140°C (284°F) for greater than 1 seconds or a cumulative of 10 seconds, 4 seconds or a cumulative of 30 seconds for LLT.