📌 Meaning of Code P1116
The code P1116 is related to the Engine Coolant Temperature (ECT) sensor.
This sensor uses a thermistor, a semiconductor device whose resistance varies with temperature.
The ECT sensor is usually mounted on the left cylinder head, near the front of the engine. It has:
- A signal circuit
- A ground circuit
The PCM (Powertrain Control Module) sends a voltage (~5 V) to the sensor via the signal circuit. Depending on the temperature:
- When cold: high resistance → high signal voltage
- When hot: low resistance → lowered signal voltage
When the returned values do not match the expected normal ranges, the PCM triggers the P1116 code.
🚨 Possible Symptoms
- Check Engine light on
- Possible symptoms related to poor engine thermal management (e.g., overheating or hard cold starts)
❗ Possible Causes
- Low engine coolant level
- Faulty ECT sensor
- Open or shorted ECT sensor harness
- Poor electrical connection in the ECT sensor circuit
- Faulty engine thermostat
🛠️ How to Fix Code P1116 Chevrolet
- Check all the possible causes listed above first.
- Visually inspect the wiring harness and associated connectors.
- Look for:
- Damaged wires
- Broken, bent, pushed, or corroded connector pins
- Also check:
- The coolant level
- The proper operation of the thermostat
- The ECT sensor using a multimeter or via a diagnostic tool