Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1380 (ENGINE CONTROLS - POWERTRAIN DTC CHARTS AND DESCRIPTIONS (HYBRID))DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONSDTC P0116: ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT RANGE/PERFORMANCE
2010 Mercury Mariner Hybrid, AWD
DTC P0116: Engine Coolant Temperature Sensor 1 Circuit Range/Performance
2010 Mercury Mariner Hybrid, AWDSECTION DTC P0116: Engine Coolant Temperature Sensor 1 Circuit Range/Performance
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
P0116 - ENGINE COOLANT TEMPERATURE SENSOR 1 CIRCUIT RANGE/PERFORMANCE
| Description: | Indicates the engine coolant temperature rationality test has failed. The powertrain control module (PCM) logic that sets this DTC indicates the engine coolant temperature (ECT) or cylinder head temperature (CHT) drifted higher than the nominal sensor calibration curve and could prevent one or more on-board diagnostic (OBD) monitors from executing. The PCM runs this logic after an engine off calibrated soak period (typically 6 hours). This soak period allows the intake air temperature (IAT) and engine coolant temperature to stabilize and not differ by more than a calibrated value. |
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| Possible Causes: |
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| Diagnostic Aids: | Make sure the IAT and the engine coolant temperature are similar when the engine is cold. Also make sure the CHT sensor and the actual engine operating temperatures are the same. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST DL . | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.