P1115 Coolant Temperature Sensor Circuit for Heat Storage System
What does P1115 mean on a Toyota?
P1115 — Coolant Temperature Sensor Circuit for Heat Storage System. This Toyota-enhanced code applies to Prius with coolant heat storage (thermos) system.
Common causes of P1115
- Failed heat storage temperature sensor
- Open or shorted sensor circuit
- Corroded sensor connector
- Low coolant in the storage tank
- ECM input fault
How to fix P1115
- Check coolant level in both engine and storage circuits
- Test sensor resistance hot and cold
- Inspect circuit wiring
- Bleed air from the storage system
- Replace the sensor per test data