AutoCodes – Toyota – P0116 2003 Toyota Highlander

P0116 2003 Toyota Highlander 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 2003 Toyota Highlander 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 3,534

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
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Code P0116 2003 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 P0116 2003 Toyota Highlander - Engine Coolant Temperature Circuit Range/Performance Problem - AutoCodes.com — P0116 2003 Toyota Highlander Code - Engine Coolant Temperature Circuit Range/Performance Problem

What does this mean?

What are the Possible Causes of the DTC P0116 2003 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 P0116 2003 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 P0116 2003 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 P0116 2003 Toyota Highlander code?

Need more information on how to fix the P0116 2003 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0116 2003 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 P0116 2003 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0116 in a 2003 Toyota Highlander?

- Common symptoms include poor fuel economy, overheating, rough idling, and the Check Engine light being illuminated.

2. What causes the OBDII code P0116 in a 2003 Toyota Highlander?

- The code is typically triggered by a faulty engine coolant temperature (ECT) sensor, a damaged ECT sensor wiring, or low coolant levels.

3. How can I diagnose the Engine Coolant Temperature Circuit Range/Performance Problem in my 2003 Toyota Highlander?

- To diagnose the issue, you can use a diagnostic scanner to read the code, check the coolant level, inspect the ECT sensor and its wiring for any damage, and test the sensor's resistance.

4. How can I repair the Engine Coolant Temperature Circuit Range/Performance Problem in my 2003 Toyota Highlander?

- Repair options include replacing the faulty ECT sensor, repairing any damaged wiring, ensuring the coolant level is correct, and clearing the error code with a scanner.

5. Can I continue driving my 2003 Toyota Highlander with OBDII code P0116?

- It is not recommended to drive the vehicle with this code present, as it can lead to overheating and potential engine damage.

6. What are the potential long-term effects of ignoring OBDII code P0116 in my 2003 Toyota Highlander?

- Ignoring the code can cause engine overheating, decreased fuel efficiency, and potential damage to engine components over time.

7. How much does it typically cost to repair OBDII code P0116 in a 2003 Toyota Highlander?

- The cost of repair can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Is it possible to prevent OBDII code P0116 from occurring in my 2003 Toyota Highlander?

- Regular maintenance, such as checking coolant levels and replacing the ECT sensor at recommended intervals, can help prevent the code from appearing.

9. Can I reset the Check Engine light after repairing OBDII code P0116 in my 2003 Toyota Highlander?

- Yes, the Check Engine light can typically be reset using a diagnostic scanner after the issue has been resolved.

10. How long does it take to repair OBDII code P0116 in a 2003 Toyota Highlander?

- The repair time can vary depending on the exact cause of the issue, but it generally takes around 1-2 hours for a professional mechanic to diagnose and fix the problem.