Trouble codes › P0116
P0116 Engine Coolant Temperature Circuit Range/Performance
Cooling
P0116 means the coolant temperature reading doesn't make sense for how long the engine has run, often a bad sensor or a stuck-open thermostat.
The coolant temperature reading doesn't make sense compared with how long the engine has run or with other temperature sensors, for example not warming up, or reading warm on a cold engine.
Usually drivable, but watch for overheating since the gauge may be wrong. Get it checked soon.
Common causes
- A failing coolant temperature sensor reading inaccurately
- Low coolant level, leaving the sensor in air
- A thermostat stuck open
- Wiring or connector problems
Symptoms
- Temperature gauge that seems wrong
- Poor fuel economy, hard starting
- Fans running at odd times
What to check first
- Check the coolant level with the engine cold.
- Compare the coolant temperature with intake air temperature after the car sits overnight; they should be within a few degrees.
- Watch the reading climb steadily as the engine warms up.
- Replace the sensor (and thermostat if it's stuck open) as needed.
What does P0116 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0116No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0116 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.