Conditions for Setting the DTC: P0118
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 less than -39°C (-38°F) for greater than 1 seconds or a cumulative of 10 seconds, 4 seconds or a cumulative of 30 seconds for LLT.