Engine-Codes.com
Engine-Codes – Chevrolet – P0118 2018 Chevrolet Silverado

P0118 2018 Chevrolet Silverado Code - Engine Coolant Temperature Circuit High Input

Quick Answer

The P0118 code for a 2018 Chevrolet Silverado indicates a problem with the Engine Coolant Temperature Circuit High Input. Common causes include Faulty Engine Coolant Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect readings to the ECM, Wiring Issues: Damaged or corroded wiring connecting the engine coolant temperature sensor to the ECM can disrupt the signal, Coolant Leak: A coolant leak can cause the engine coolant temperature sensor to read a high temperature due to a low coolant level. 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
P0118 2018 Chevrolet Silverado indicates Engine Coolant Temperature Circuit High Input.
Common causes
Common causes include Faulty Engine Coolant Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect readings to the ECM, Wiring Issues: Damaged or corroded wiring connecting the engine coolant temperature sensor to the ECM can disrupt the signal, Coolant Leak: A coolant leak can cause the engine coolant temperature sensor to read a high temperature due to a low coolant level.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0118 2018 Chevrolet Silverado Description

The P0118 code for a 2018 Chevrolet Silverado indicates a problem with the Engine Coolant Temperature Circuit High Input. This means that the Engine Control Module (ECM) has detected that the engine coolant temperature sensor is reading a higher than normal temperature. The engine coolant temperature sensor is a crucial component that monitors the temperature of the engine coolant, providing data to the ECM to help regulate fuel delivery and ignition timing.

OBDII Code P0118 2018 Chevrolet Silverado - Engine Coolant Temperature Circuit High Input
P0118 2018 Chevrolet Silverado Code - Engine Coolant Temperature Circuit High Input

Common Causes of P0118 2018 Chevrolet Silverado

  1. Faulty Engine Coolant Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect readings to the ECM.
  2. Wiring Issues: Damaged or corroded wiring connecting the engine coolant temperature sensor to the ECM can disrupt the signal.
  3. Coolant Leak: A coolant leak can cause the engine coolant temperature sensor to read a high temperature due to a low coolant level.
  4. Thermostat Stuck Open: If the thermostat is stuck open, the engine may not reach the proper operating temperature, causing the sensor to read high temperatures.
  5. ECM Malfunction: In rare cases, a malfunctioning ECM may be receiving incorrect data from the engine coolant temperature sensor.

Symptoms of P0118 2018 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with the P0118 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Engine Overheating: Since the engine coolant temperature sensor is providing incorrect readings, the engine may overheat due to improper cooling system operation.
  3. Poor Fuel Efficiency: Incorrect temperature readings can lead to the ECM delivering the wrong fuel mixture, resulting in decreased fuel efficiency.
  4. Rough Idling: A high input from the engine coolant temperature sensor can cause the engine to idle roughly or inconsistently.
  5. Hard Starting: The vehicle may have difficulty starting if the engine coolant temperature sensor is providing inaccurate data to the ECM.

How to Fix P0118 2018 Chevrolet Silverado

  1. Diagnose the Issue: Use a scan tool to read the code and determine if the engine coolant temperature sensor is malfunctioning or if there are other underlying issues.
  2. Inspect Wiring: Check the wiring connecting the engine coolant temperature sensor to the ECM for any damage or corrosion. Repair or replace as needed.
  3. Replace Coolant Temperature Sensor: If the sensor is faulty, replace it with a new one to ensure accurate temperature readings.
  4. Check Coolant Level: Verify that the coolant level is adequate and there are no leaks in the cooling system.
  5. Test Thermostat: Check the thermostat to ensure it is functioning properly and replace it if necessary.

Cost to Fix P0118 2018 Chevrolet Silverado

The cost of repairing a P0118 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. Generally, the cost of replacing an engine coolant temperature sensor ranges from $50 to $200, including parts and labor. If wiring repairs or thermostat replacement are needed, additional costs may apply. It's important to note that diagnostic time and labor rates at auto repair shops can fluctuate based on factors such as location and shop rates, so it's recommended to obtain quotes from local shops for a more accurate estimate.

Need more information about the P0118 2018 Chevrolet Silverado code?

Need more information on how to fix the P0118 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0118 2018 Chevrolet Silverado 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 P0118 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0118 in a 2018 Chevrolet Silverado?

The common symptoms of OBDII code P0118 in a 2018 Chevrolet Silverado include engine overheating, rough idling, poor fuel economy, and potential stalling.

2. What does the OBDII code P0118 Engine Coolant Temperature Circuit High Input mean for a 2018 Chevrolet Silverado?

The P0118 code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the engine coolant temperature sensor.

3. What are the possible causes of the P0118 code in a 2018 Chevrolet Silverado?

Possible causes of the P0118 code in a 2018 Chevrolet Silverado include a faulty coolant temperature sensor, damaged wiring or connectors, low coolant level, or a malfunctioning ECM.

4. How can I diagnose the P0118 code on my 2018 Chevrolet Silverado?

To diagnose the P0118 code on your 2018 Chevrolet Silverado, you can start by checking the coolant level, inspecting the sensor and its wiring for any damage, and using a multimeter to test the sensor's resistance.

5. Can I continue driving my 2018 Chevrolet Silverado with the P0118 code?

It is not recommended to drive your 2018 Chevrolet Silverado with the P0118 code, as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

6. How do I repair the P0118 code on my 2018 Chevrolet Silverado?

To repair the P0118 code on your 2018 Chevrolet Silverado, you may need to replace the coolant temperature sensor, repair any damaged wiring or connectors, refill coolant if low, or reset the ECM.

7. Will resetting the ECM clear the P0118 code on a 2018 Chevrolet Silverado?

Resetting the ECM may temporarily clear the P0118 code, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root cause.

8. Can a DIY enthusiast fix the P0118 code on a 2018 Chevrolet Silverado?

Depending on your skill level and access to tools, a DIY enthusiast may be able to fix the P0118 code by following repair guides and using proper diagnostic equipment.

9. Is the P0118 code a common issue in 2018 Chevrolet Silverados?

The P0118 code related to the Engine Coolant Temperature Circuit High Input is a relatively common issue in 2018 Chevrolet Silverados and can be caused by various factors.

10. How much does it cost to repair the P0118 code in a 2018 Chevrolet Silverado?

The cost to repair the P0118 code in a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue, but it typically involves replacing the coolant temperature sensor, which can range from $50 to $150 including labor.

Discuss the causes and fixes for P0118 2018 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P0118 2018 Chevrolet Silverado comments

No comments found for this page.