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P0116 Lexus Code - Engine Coolant Temperature Circuit Range / Performance Problem

Quick Answer

The engine coolant temperature sensor is used to monitor the engine coolant temperature. Common causes include Low engine coolant level, Faulty Engine Coolant Thermostat, Faulty Engine Coolant Temperature (ECT) sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0116 Lexus indicates Engine Coolant Temperature Circuit Range / Performance Problem.
Common causes
Common causes include Low engine coolant level, Faulty Engine Coolant Thermostat, Faulty Engine Coolant Temperature (ECT) sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 16,204
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Aug 23, 2022
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Code P0116 Lexus Description

The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The Engine Control Module (ECM) monitors the sensor voltage and uses this value to calculate the engine coolant temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the engine coolant temperature sensor circuit and stores a Diagnostic Trouble Code (DTC).
OBDII Code P0116 Lexus - Engine Coolant Temperature Circuit Range / Performance Problem - AutoCodes.com
P0116 Lexus Code - Engine Coolant Temperature Circuit Range / Performance Problem
What does this mean?

What are the Possible Causes of the DTC P0116 Lexus?

  • Low engine coolant level
  • Faulty Engine Coolant Thermostat
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature sensor harness is open or shorted
  • Engine Coolant Temperature sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0116 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Start by checking the engine coolant level at the coolant reservoir, a low level may indicate a coolant leak. If the coolant level is correct, you should replace the Engine Coolant Temperature (ECT) sensor to fix the problem. The Engine Coolant Thermostat must be replaced every time there is a repair with the coolant system.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0116 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0116 Lexus Code

1. What does the OBDII code P0116 mean on a Lexus?

P0116 indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit, where the sensor's readings are outside the expected range or performance.

2. What are the symptoms of code P0116 on a Lexus?

Common symptoms include poor fuel economy, difficulty starting the engine, engine misfires, rough idling, and an illuminated check engine light.

3. What causes the P0116 code to appear in a Lexus?

Possible causes include a faulty ECT sensor, wiring issues (damaged or corroded), a stuck thermostat, low coolant levels, or a malfunctioning engine control module (ECM).

4. Can I drive my Lexus with a P0116 code?

Driving with a P0116 code is not recommended, as it can lead to engine overheating or poor performance, potentially causing further damage.

5. How do I fix the P0116 code on my Lexus?

Repairs may involve replacing the ECT sensor, fixing damaged wiring, flushing or refilling coolant, or replacing a stuck thermostat.

6. Where is the ECT sensor located on a Lexus?

The ECT sensor is typically located near the thermostat housing or on the engine block, where it measures coolant temperature.

7. How much does it cost to repair a P0116 code on a Lexus?

Repair costs vary, but replacing the ECT sensor usually costs between $100 and $250, including parts and labor.

8. Can a low coolant level trigger the P0116 code in a Lexus?

Yes, low coolant levels can cause inconsistent temperature readings, leading to a P0116 code.

9. How can I prevent the P0116 code from recurring on my Lexus?

Regularly check and maintain coolant levels, replace the thermostat if needed, and inspect the ECT sensor and wiring during routine maintenance.

10. Will clearing the P0116 code fix the problem on a Lexus?

Clearing the code will turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

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