P0118 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet code?
Need more information on how to fix the P0118 Chevrolet code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0118 Chevrolet code diagnosed by a professional: Find a repair shop in your area
Information for Specific Chevrolet Models
- P0118 2014 Chevrolet Silverado — Engine Coolant Temperature Circuit High Input
- P0118 2015 Chevrolet Silverado — Engine Coolant Temperature Circuit High Input
- P0118 2016 Chevrolet Silverado — Engine Coolant Temperature Circuit High Input
- P0118 2017 Chevrolet Silverado — Engine Coolant Temperature Circuit High Input
- P0118 2018 Chevrolet Silverado — Engine Coolant Temperature Circuit High Input
Frequently Asked Questions about P0118 Chevrolet Code
1. What are the common symptoms of OBDII code P0118 (Chevrolet)?
The common symptoms of P0118 include the engine running hotter than normal, the temperature gauge reading unusually high, and potential issues with the vehicle's fuel efficiency.
2. What are the possible causes of OBDII code P0118 (Chevrolet)?
The potential causes of P0118 include a faulty engine coolant temperature (ECT) sensor, a malfunctioning thermostat, wiring issues in the ECT circuit, or low coolant levels.
3. How can I diagnose the OBDII code P0118 (Chevrolet)?
To diagnose P0118, you can use an OBDII scanner to retrieve the trouble code, visually inspect the ECT sensor and its wiring for any signs of damage, and test the sensor's resistance with a multimeter.
4. Can a faulty thermostat trigger OBDII code P0118 (Chevrolet)?
Yes, a faulty thermostat can cause the engine coolant temperature to be higher than normal, triggering the P0118 trouble code due to incorrect temperature readings being sent to the engine control module.
5. What are some repair tips for fixing OBDII code P0118 (Chevrolet)?
Repair tips for P0118 include replacing the ECT sensor if it is faulty, checking and replacing the thermostat if needed, ensuring proper coolant levels, and inspecting the wiring for any faults.
6. Is it safe to continue driving with OBDII code P0118 (Chevrolet) present?
It is not recommended to drive with P0118 as it can lead to engine overheating and potential damage. It's best to address the issue promptly to avoid more serious problems.
7. Can a low coolant level trigger OBDII code P0118 (Chevrolet)?
Yes, low coolant levels can impact the engine coolant temperature readings, causing the ECT sensor to detect high temperatures and trigger the P0118 trouble code.
8. How much does it typically cost to repair OBDII code P0118 (Chevrolet)?
The cost to repair P0118 can vary depending on the root cause of the issue. Generally, replacing the ECT sensor can cost between $50 to $200, while replacing a faulty thermostat can range from $100 to $300.
9. Will resetting the trouble code resolve OBDII code P0118 (Chevrolet)?
Resetting the trouble code may temporarily clear the check engine light, but if the underlying issue causing P0118 is not addressed, the code is likely to reappear.
10. Can a DIY enthusiast fix OBDII code P0118 (Chevrolet) at home?
Depending on the cause of P0118, DIY enthusiasts with automotive repair experience can potentially fix the issue at home by replacing the ECT sensor, checking the thermostat, and ensuring proper coolant levels. However, complex wiring issues may require professional assistance.
Discuss the causes and fixes for P0118 Chevrolet OBDII Code
Code P0118 Chevrolet 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.
