P0116
Medium SeverityEngine Coolant Temperature Sensor Range/Performance
Cooling System
What Does P0116 Mean?
The ECT sensor reading is not changing as expected during warm-up. Either the sensor is lazy or the thermostat is preventing normal warm-up.
Common Fix
Replace thermostat
Estimated Cost (DIY)
$15 - $40
Symptoms
- ⚠️Slow warm-up
- ⚠️Temperature gauge stays low
- ⚠️Poor heater output
- ⚠️Increased fuel consumption
Common Causes
How to Diagnose P0116
- 1Monitor ECT temperature rise during warm-up
- 2Compare ECT to infrared thermometer reading
- 3Check thermostat operation
- 4Inspect for air in cooling system
OEM Diagnostic Flowchart
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Related Resources
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OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...
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Related Codes
The ECT sensor circuit has a general malfunction. This sensor tells the ECM how warm the engine is for fuel, timing, and fan control.
The engine is not reaching normal operating temperature within the expected time. The thermostat is almost certainly stuck open.
ECT sensor voltage is too low, indicating an impossibly high temperature. Usually a shorted sensor.
Frequently Asked Questions
- Is P0116 the thermostat or the sensor?
- Most commonly the thermostat is stuck open. If the engine truly does not reach operating temp, replace the thermostat first.
- How long should warm-up take?
- A healthy engine should reach 190-210°F within 5-10 minutes of driving. If it takes longer, the thermostat is likely stuck open.
Related Repair Guides
If your vehicle has triggered P0116, these DIY repair guides may help: