P0116: ECT Sensor Circuit Range/Performance
Severity: medium
What it means: The engine coolant temperature sensor signal is not matching expected behavior (range/performance).
Safe to drive? Watch the temperature gauge closely. A bad reading can hide overheating or keep the cooling fans from running.
Common symptoms
- Check-engine light
- Hard starting
- Poor fuel economy
- Cooling fan running constantly or not at all
Likely causes, ranked
- Faulty coolant temperature sensorDIY
- Wiring or connector faultDIY
- Low coolant or a thermostat problemShop
AD SLOT 1 (placeholder)
What it means: The engine coolant temperature sensor signal is not matching expected behavior (range/performance).
Severity: Medium. Safe to drive? Watch the temperature gauge closely. A bad reading can hide overheating or keep the cooling fans from running.
DIY or shop?
Replacing the sensor is commonly DIY. Confirm the coolant level first.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.
AD SLOT 2 (placeholder)