P1117: Engine Coolant Sensor intermittent/ECT Sensor Intermittent
MediumPowertrainCooling System
What does P1117 mean?
P1117 is a diagnostic trouble code indicating "Engine Coolant Sensor intermittent/ECT Sensor Intermittent". A sensor in the cooling system is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Engine overheating
- Temperature gauge reading high
- Heater not working properly
- Intermittent warning lights
Estimated repair cost
Typical range in Australia (parts + labour)
$100 – $600 AUD
Common causes
- Stuck thermostat (open or closed)
- Low coolant level or coolant leak
- Failed coolant temperature sensor
- Faulty water pump
- Blocked radiator
What should you do?
Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.
Get a diagnosis for YOUR car
Code P1117 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.
Related codes
P1116Engine Coolant sensor out of range/ECT Sensor Out Of Self Test Range
P1115Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input
P1114Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input
P1136Fan Control Circuit Malfunction