What does it mean?
P1114 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: ECT Sensor Circuit Low Input (Intermittent) .
Symptoms
- Check engine light that appears intermittently over several trips
- Coolant temperature in live data jumping to an extreme hot value for a moment
- Cooling fans switching to high speed for no reason
- Temperature gauge flicking upward and returning
- Lean running during the fault, causing hesitation and a stumble on acceleration
- Hard cold starting because the module fuels as if the engine were already warm
Likely causes
- Signal wire chafed against the block, a bracket or the thermostat housing
- Coolant leaking into the connector from a weeping sensor seal and bridging the terminals
- Sensor with an internal short that appears when hot or under vibration
- Corroded terminals partly touching each other inside a damaged connector
- Harness pinched during a previous cooling system or timing repair
- Poor ground or a shared ground fault affecting several temperature circuits
How to fix it
- Graph the coolant temperature value during a road test and note the exact moments it collapses
- Compare the live value with an infrared thermometer reading at the sensor housing to confirm which one is wrong
- Unplug the sensor with the ignition on; the value should swing to the opposite extreme, proving the wiring and module respond
- With the sensor disconnected, check resistance between the signal wire and ground while flexing the harness
- Inspect the connector for coolant, corrosion and displaced terminals; dry, clean and reseal it
- Measure the sensor resistance cold and hot against the manufacturer's table
- Repair the shorted harness or fit a new sensor and seal, then confirm a smooth warm-up curve