P1116 Coolant Temperature Sensor Stack for Coolant Heat Storage System
What does P1116 mean on a Toyota?
P1116 — Coolant Temperature Sensor Stack for Coolant Heat Storage System. This Toyota-enhanced code applies to Prius with coolant heat storage.
Common causes of P1116
- Drifting heat storage sensor
- Sensor stack reading out of expected band
- Low storage coolant level
- Aging sensor
- Wiring fault
How to fix P1116
- Verify storage coolant level
- Compare sensor readings across warm-up
- Test sensor resistance
- Check wiring integrity
- Replace the sensor if readings stack wrong