P0117Severity: Medium
P0117 – Engine Coolant Temperature (ECT) Sensor Low Input
The ECT sensor reports a low (short-circuit) signal.
What it means
The coolant temperature sensor voltage is very low (reads too hot). A false high-temp reading can make the engine run rich/lean.
Symptoms
- Check-engine light
- Fan running constantly
- Hard starting
Common causes
- Shorted wiring
- Faulty ECT sensor
- Connector issue
- Ground fault
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Frequently asked questions
What does trouble code P0117 mean?
P0117 – Engine Coolant Temperature (ECT) Sensor Low Input. The coolant temperature sensor voltage is very low (reads too hot). A false high-temp reading can make the engine run rich/lean.
Can I drive with a P0117 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.