AutoCodes – Toyota – P0115 2005 Toyota Highlander

P0115 2005 Toyota Highlander Code - Engine Coolant Temperature Circuit

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: P0115 2005 Toyota Highlander indicates Engine Coolant Temperature Circuit.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,552

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
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0115 2005 Toyota Highlander 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 P0115 2005 Toyota Highlander - Engine Coolant Temperature Circuit - AutoCodes.com — P0115 2005 Toyota Highlander Code - Engine Coolant Temperature Circuit

What does this mean?

What are the Possible Causes of the DTC P0115 2005 Toyota Highlander?

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 P0115 2005 Toyota Highlander?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0115 2005 Toyota Highlander 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 P0115 2005 Toyota Highlander code?

Need more information on how to fix the P0115 2005 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0115 2005 Toyota Highlander code diagnosed by a professional: Find a repair shop in your area

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 P0115 2005 Toyota Highlander Code

1. What does OBDII code P0115 on a 2005 Toyota Highlander indicate?

The code P0115 refers to a malfunction in the Engine Coolant Temperature (ECT) Circuit of the vehicle.

2. What are the common symptoms of a P0115 code in a 2005 Toyota Highlander?

Common symptoms include inaccurate temperature readings on the dashboard, engine overheating, poor fuel economy, and potential stalling or rough idling.

3. What are the possible causes of a P0115 code in a 2005 Toyota Highlander?

Possible causes include a faulty Engine Coolant Temperature (ECT) sensor, damaged wiring or connectors in the ECT circuit, low coolant levels, or a malfunctioning thermostat.

4. How can I diagnose a P0115 code on my 2005 Toyota Highlander?

Diagnosing a P0115 code involves checking the ECT sensor for proper operation, inspecting the wiring and connectors for damage, verifying coolant levels, and testing the thermostat.

5. How can I repair a P0115 code on my 2005 Toyota Highlander?

Repairing a P0115 code may involve replacing the Engine Coolant Temperature (ECT) sensor, repairing or replacing damaged wiring or connectors, ensuring proper coolant levels, and replacing a faulty thermostat if needed.

6. Can a P0115 code in a 2005 Toyota Highlander cause engine damage?

Continuing to drive with a P0115 code may lead to engine damage due to overheating if the issue is not addressed promptly.

7. Will a P0115 code on a 2005 Toyota Highlander affect fuel efficiency?

Yes, a P0115 code can affect fuel efficiency as it may cause the engine to run too rich or too lean, impacting overall fuel consumption.

8. Is it safe to drive with a P0115 code in a 2005 Toyota Highlander?

It is not recommended to drive with a P0115 code as it can lead to engine overheating and potentially more serious damage.

9. How much does it typically cost to repair a P0115 code on a 2005 Toyota Highlander?

The cost of repairing a P0115 code can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor.

10. Can I reset the P0115 code on my 2005 Toyota Highlander myself?

Yes, you can reset the P0115 code using an OBDII scanner or by disconnecting the car battery for a few minutes, but it is important to address the underlying issue causing the code to prevent it from reoccurring.