AutoCodes – Toyota – P0116 2005 Toyota Prius

P0116 2005 Toyota Prius Code - Engine Coolant Temperature Circuit Range/Performance Problem

Quick Answer

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty engine coolant thermostat. 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 2005 Toyota Prius indicates Engine Coolant Temperature Circuit Range/Performance Problem.
Common causes: Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty engine coolant thermostat.
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 7,751

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0116 2005 Toyota Prius Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

OBDII Code P0116 2005 Toyota Prius - Engine Coolant Temperature Circuit Range/Performance Problem - AutoCodes.com — P0116 2005 Toyota Prius Code - Engine Coolant Temperature Circuit Range/Performance Problem

What does this mean?

What are the Possible Causes of the DTC P0116 2005 Toyota Prius?

Low engine coolant level
Faulty Engine Coolant Temperature (ECT) sensor
Faulty engine coolant thermostat
Engine Coolant Temperature (ECT) sensor harness is open or shorted
Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

How to Fix the DTC P0116 2005 Toyota Prius?

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

If there are no coolant leaks, check/replace the thermostat first, if problem is still there check/replace coolant temperature sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0116 2005 Toyota Prius 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.

Need more information about the P0116 2005 Toyota Prius code?

Need more information on how to fix the P0116 2005 Toyota Prius code? Get Access to Factory Service Manuals

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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 2005 Toyota Prius Code

1. What are the common symptoms of OBDII code P0116 in a 2005 Toyota Prius?

The common symptoms of code P0116 in a 2005 Toyota Prius include engine overheating, poor fuel economy, rough idling, and a potential decrease in engine performance.

2. What are the possible causes of OBDII code P0116 in a 2005 Toyota Prius?

The potential causes of code P0116 in a 2005 Toyota Prius include a faulty engine coolant temperature sensor, issues with the coolant temperature sensor circuit, low coolant levels, or a malfunctioning thermostat.

3. How can I diagnose the OBDII code P0116 in my 2005 Toyota Prius?

Diagnosing code P0116 in a 2005 Toyota Prius involves using an OBDII scanner to retrieve the fault code, checking the coolant level, inspecting the coolant temperature sensor and its wiring for any damage, and testing the thermostat.

4. How serious is OBDII code P0116 in a 2005 Toyota Prius?

Code P0116 in a 2005 Toyota Prius should be addressed promptly as it can lead to engine overheating, potential damage to engine components, and reduced fuel efficiency if left unresolved.

5. Can I continue driving my 2005 Toyota Prius with OBDII code P0116?

It is not recommended to drive your 2005 Toyota Prius with code P0116 as it can lead to engine overheating and potential damage. It is best to address the issue as soon as possible.

6. How do I repair OBDII code P0116 in my 2005 Toyota Prius?

Repairing code P0116 in a 2005 Toyota Prius may involve replacing the engine coolant temperature sensor, repairing any damaged wiring in the sensor circuit, ensuring proper coolant levels, or replacing a faulty thermostat.

7. Will resetting the OBDII code P0116 in my 2005 Toyota Prius make it go away permanently?

Simply resetting the code may temporarily clear the check engine light, but if the underlying issue causing code P0116 is not addressed, the code is likely to reappear.

8. How much does it cost to fix OBDII code P0116 in a 2005 Toyota Prius?

The cost to fix code P0116 in a 2005 Toyota Prius can vary depending on the cause of the issue. It may range from a relatively low cost for a sensor replacement to a higher cost if additional repairs are needed.

9. Can a DIY enthusiast repair OBDII code P0116 in a 2005 Toyota Prius?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address code P0116 in a 2005 Toyota Prius by following proper diagnostic procedures and repair steps outlined in a service manual.

10. How often does OBDII code P0116 occur in a 2005 Toyota Prius?

Code P0116 can occur in a 2005 Toyota Prius due to various factors such as sensor wear, wiring issues, or cooling system problems, but it is not considered a common occurrence if the vehicle is properly maintained.