AutoCodes – Lexus – P0117 Lexus

P0117 Lexus Code - Engine Coolant Temperature Circuit Low Input

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: P0117 Lexus indicates Engine Coolant Temperature Circuit Low Input.
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 26,481

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 23, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0117 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 P0117 Lexus - Engine Coolant Temperature Circuit Low Input - AutoCodes.com — P0117 Lexus Code - Engine Coolant Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0117 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 P0117 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 P0117 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 P0117 Lexus Code

1. What are the common symptoms of an OBDII code P0117 in a Lexus?

- Common symptoms include engine overheating, rough idling, poor fuel efficiency, and a temperature gauge reading lower than normal.

2. What causes the OBDII code P0117 in a Lexus?

- The code is typically triggered by a malfunction in the engine coolant temperature sensor or its circuit, which may be caused by a faulty sensor, damaged wiring, or a problem with the engine control module.

3. How can I diagnose the issue causing the OBDII code P0117 in my Lexus?

- You can use a multimeter to test the engine coolant temperature sensor for proper resistance values, check the sensor's wiring for continuity and shorts, and inspect the connector for any signs of damage or corrosion.

4. Is it safe to continue driving my Lexus with an OBDII code P0117?

- It is not recommended to drive the vehicle with this code active, as it can lead to potential engine damage from overheating or incorrect fuel mixture, affecting performance and reliability.

5. How can I repair the Engine Coolant Temperature Circuit Low Input issue in my Lexus?

- Repair options include replacing the faulty engine coolant temperature sensor, repairing damaged wiring or connectors, and resetting the trouble code with an OBDII scanner.

6. Can a DIY enthusiast fix the OBDII code P0117 in a Lexus?

- Depending on your skill level and access to tools, you may be able to diagnose and repair the issue yourself, but it's recommended to consult a professional if you're unsure or lack experience in automotive repairs.

7. Are there any preventive measures to avoid the OBDII code P0117 from recurring in my Lexus?

- Regular maintenance, such as checking coolant levels, inspecting sensor connections, and keeping the cooling system in good condition, can help prevent the recurrence of this code.

8. Will resetting the OBDII code P0117 in my Lexus make the issue go away permanently?

- Resetting the code may clear the warning temporarily, but if the underlying problem causing the code is not addressed, it is likely to reappear once the issue persists.

9. How long does it typically take to repair the Engine Coolant Temperature Circuit Low Input problem in a Lexus?

- The repair time can vary depending on the exact cause of the issue, but in general, it may take a few hours to diagnose and fix the problem with the engine coolant temperature sensor or its circuit.

10. Can a Lexus dealership help me with diagnosing and repairing the OBDII code P0117?

- Yes, Lexus dealerships have trained technicians and specialized equipment to diagnose and repair OBDII codes like P0117, ensuring proper troubleshooting and reliable solutions for your vehicle.