P1116 The engine control module saw the engine coolant temperature rise or fall outside its expected range

What does P1116 mean on a Honda?

P1116. The engine control module saw the engine coolant temperature rise or fall outside its expected range. The module may misjudge engine temperature and run the cooling fan or fuel mixture incorrectly.. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of P1116

• Low engine coolant level
• Faulty Engine Coolant Temperature (ECT) sensor
• Engine Coolant Temperature (ECT) sensor harness is open or shorted
• Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
• Faulty engine coolant thermostat

How to fix P1116

1. Confirm the code with a scan tool and check for related faults
2. Inspect the sensor and its connector for corrosion, moisture, and loose pins
3. Check the wiring for an open or short between the sensor and the control module
4. Test the sensor signal against the factory spec before replacing parts
5. Replace the sensor if it fails testing, then clear codes and retest

Sources and review

• Based on one independent source.
• Last updated 2026-10-02.