Code P0116 - Coolant Temperature Sensor Circuit Range/Performance Problem: Condition

WARNING: This page is about a different car, the 1995 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Code is set when sensor temperature is 86°F (30°C) or less for at least 20 minutes of engine operation. Possible causes are:

Coolant Temperature Sensor (CTS).
Cooling system.