P0116
Medium SeverityEngine Coolant Temperature Sensor Range/Performance
Cooling System
P0116 — Instant Answer
Engine Coolant Temperature Sensor Range/Performance
Severity: MEDIUM SEVERITY
Meaning: 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.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $15 - $40
Most common causes:
- 1. Stuck-open thermostat (35-45% of cases)
- 2. Faulty ECT sensor (10-25% of cases)
- 3. Air pocket in cooling system (10-25% of cases)
- 4. Wrong thermostat temperature rating (5-10% of cases)
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 Procedures for P0116
Engine Coolant Temperature Circuit Range/Performance Found 11 OEM service manual procedures.
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Coolant Temperature Sensor - Removal & Installation
Showing 8 of 11 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0116 Engine Coolant Temperature Sensor Range/Performance.
Thermostat
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Engine Coolant
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Radiator
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Water Pump
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Coolant Temp Sensor
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Check SpecificationsBattery tester
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0116.
OEM Manual Evidence
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Exact Repair Workflows
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Open the exact repair flow most commonly associated with P0116 on this vehicle.
Open the exact repair flow most commonly associated with P0116 on this vehicle.
Open the exact repair flow most commonly associated with P0116 on this vehicle.
Open the exact repair flow most commonly associated with P0116 on this vehicle.
Open the exact repair flow most commonly associated with P0116 on this vehicle.
Exact Vehicle Hubs
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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.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29