Possible Causes
WARNING: This page is about a different car, the 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0115 is set when an open or short in engine coolant temperature sensor circuit. Possible causes are:
- ECT sensor circuit is open or shorted.
- Defective ECT sensor.
- Defective ECM.