P0118 2016 GMC Sierra Code - Engine Coolant Temperature Circuit High Input
Quick Answer
The P0118 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a high input signal in the engine coolant temperature (ECT) circuit. Common causes include Faulty ECT Sensor: A malfunctioning ECT sensor can provide inaccurate temperature readings, triggering the P0118 code, Wiring or Connector Issues: Damage or corrosion in the wiring or connectors of the ECT circuit can disrupt the signal from the sensor to the ECM, Coolant Level: Low coolant level or poor coolant circulation can lead to higher than normal engine temperatures, causing the ECT sensor to detect a high input signal. 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 2016 GMC Sierra indicates Engine Coolant Temperature Circuit High Input.
- Common causes
- Common causes include Faulty ECT Sensor: A malfunctioning ECT sensor can provide inaccurate temperature readings, triggering the P0118 code, Wiring or Connector Issues: Damage or corrosion in the wiring or connectors of the ECT circuit can disrupt the signal from the sensor to the ECM, Coolant Level: Low coolant level or poor coolant circulation can lead to higher than normal engine temperatures, causing the ECT sensor to detect a high input signal.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0118 2016 GMC Sierra Description
The P0118 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a high input signal in the engine coolant temperature (ECT) circuit. The ECT sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM). When the ECM detects a high input signal from the ECT sensor, it means that the temperature reading is abnormally high and may not reflect the actual coolant temperature in the engine.
Common Causes of P0118 2016 GMC Sierra
- Faulty ECT Sensor: A malfunctioning ECT sensor can provide inaccurate temperature readings, triggering the P0118 code.
- Wiring or Connector Issues: Damage or corrosion in the wiring or connectors of the ECT circuit can disrupt the signal from the sensor to the ECM.
- Coolant Level: Low coolant level or poor coolant circulation can lead to higher than normal engine temperatures, causing the ECT sensor to detect a high input signal.
- ECM Malfunction: A fault in the engine control module can also cause the P0118 code by misinterpreting the signal from the ECT sensor.
Symptoms of P0118 2016 GMC Sierra
- 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.
- Engine Overheating: An inaccurate temperature reading from the ECT sensor can cause the engine to overheat, leading to potential damage.
- Poor Fuel Efficiency: Incorrect engine temperature readings can result in poor fuel efficiency due to incorrect adjustments made by the ECM.
- Rough Idle: The engine may idle roughly or inconsistently due to incorrect temperature readings affecting fuel delivery and ignition timing.
How to Fix P0118 2016 GMC Sierra
- Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the ECT sensor, wiring, and connectors to identify the root cause of the high input signal.
- Replace ECT Sensor: If the ECT sensor is faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
- Check Coolant Level: Verify that the coolant level is adequate and check for any leaks or issues with the cooling system that could be affecting engine temperature.
- Repair Wiring/Connectors: Repair any damaged wiring or connectors in the ECT circuit to ensure a proper signal transmission between the sensor and ECM.
- Clear DTC and Test Drive: Clear the DTC from the ECM's memory after making repairs and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0118 2016 GMC Sierra
The typical repair costs for addressing the P0118 code on a 2016 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that the actual diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. While most auto repair shops charge between $80 and $150 per hour, rates may be higher in metropolitan areas or at dealerships and lower at independent shops. For a more accurate estimate, it is advisable to check with local auto repair shops.
Need more information about the P0118 2016 GMC Sierra code?
Need more information on how to fix the P0118 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0118 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0118 2016 GMC Sierra Code
No Frequently Asked Questions about P0118 2016 GMC Sierra Code found.
Discuss the causes and fixes for P0118 2016 GMC Sierra OBDII Code
Code P0118 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.