P0118 2018 Chevrolet Silverado Code - Engine Coolant Temperature Circuit High Input
Quick Answer
The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor. 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 Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor.
- 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.
Code P0118 2018 Chevrolet Silverado Description
The ECM uses this high side coolant rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the ignition is OFF. If the calibrated ignition OFF time is met at start-up, the ECM will compare the temperature difference between the ECT and the intake air temperature (IAT) to determine if the temperatures are within an acceptable operating range of each other. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a the ECT is colder than -39°C (-38°F) for greater than 5 s.
What are the Possible Causes of the DTC P0118 2018 Chevrolet Silverado?
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature sensor harness is open or shorted
- Engine Coolant Temperature sensor electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0118 2018 Chevrolet Silverado?
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 P0118 2018 Chevrolet Silverado 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 P0118 2018 Chevrolet Silverado code?
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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.
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