P0118 2018 GMC Sierra Code - Engine Coolant Temperature Circuit High Input
Quick Answer
The P0118 code indicates that the Engine Coolant Temperature (ECT) sensor is sending a signal to the engine control module (ECM) that is higher than the normal operating range. Common causes include Faulty ECT sensor, Short or open circuit in the ECT sensor wiring, Corroded connector leading to poor connection. 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 GMC Sierra indicates Engine Coolant Temperature Circuit High Input.
- Common causes
- Common causes include Faulty ECT sensor, Short or open circuit in the ECT sensor wiring, Corroded connector leading to poor connection.
- 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 P0118 2018 GMC Sierra Description
The P0118 code indicates that the Engine Coolant Temperature (ECT) sensor is sending a signal to the engine control module (ECM) that is higher than the normal operating range. The ECT sensor is a crucial component that measures the temperature of the engine coolant and provides this information to the ECM. This data is essential for the ECM to adjust fuel delivery and ignition timing to ensure optimal engine performance at all times.
Common Causes of P0118 2018 GMC Sierra
- Faulty ECT sensor
- Short or open circuit in the ECT sensor wiring
- Corroded connector leading to poor connection
- Malfunctioning ECM
- Coolant level too low to provide an accurate reading
Symptoms of P0118 2018 GMC Sierra
- Check Engine Light illuminated on the dashboard
- Engine running hotter than normal
- Reduced fuel economy
- Engine misfires or rough idling
- Failsafe mode activated by the ECM
How to Fix P0118 2018 GMC Sierra
- Use a diagnostic scanner to retrieve the trouble code and freeze frame data.
- Inspect the ECT sensor and its wiring for any visible damage or corrosion.
- Test the ECT sensor resistance with a multimeter to determine if it is within the manufacturer's specifications.
- Replace the ECT sensor if it is found to be faulty or out of range.
- Clear the trouble codes and perform a test drive to verify that the issue has been resolved.
Cost to Fix P0118 2018 GMC Sierra
The cost of repairing a P0118 code can vary depending on the root cause of the issue. On average, replacing the ECT sensor can cost between $50 and $150 for the part, with additional costs for labor. The total repair cost, including diagnosis time and labor, can range from $150 to $300 at most auto repair shops. It is recommended to consult with a professional mechanic to get an accurate estimate based on your specific vehicle and location.
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Frequently Asked Questions about P0118 2018 GMC Sierra Code
1. What does OBDII code P0118 on a 2018 GMC Sierra mean?
The P0118 code indicates a high input signal from the Engine Coolant Temperature (ECT) sensor circuit.
2. What are the common symptoms of OBDII code P0118 in a 2018 GMC Sierra?
Common symptoms include engine overheating, rough idling, poor fuel economy, and the Check Engine light illuminating on the dashboard.
3. What can cause the OBDII code P0118 in a 2018 GMC Sierra?
Potential causes of the P0118 code include a faulty ECT sensor, a corroded or damaged connector/wiring, low coolant levels, or a malfunctioning thermostat.
4. How can I diagnose the OBDII code P0118 in my 2018 GMC Sierra?
Diagnosing the P0118 code involves checking the ECT sensor and its wiring for any visible damage, testing the sensor's resistance, and verifying coolant levels and system operation.
5. Can I continue driving my 2018 GMC Sierra with the P0118 code?
It is not recommended to continue driving with the P0118 code, as it can lead to potential engine damage from overheating or incorrect temperature readings.
6. How can I repair the OBDII code P0118 in my 2018 GMC Sierra?
Repairing the P0118 code may involve replacing the ECT sensor, repairing any damaged wiring or connectors, topping up coolant levels, or addressing any thermostat issues.
7. Will resetting the Check Engine light resolve the P0118 code in my 2018 GMC Sierra?
Resetting the Check Engine light may temporarily clear the code, but if the underlying issue causing the P0118 code is not addressed, the light will likely come back on.
8. Can a DIY enthusiast fix the OBDII code P0118 in a 2018 GMC Sierra?
Depending on your mechanical skills and access to tools, some DIY enthusiasts may be able to address the P0118 code by replacing the ECT sensor or checking for wiring issues.
9. How much does it cost to repair the OBDII code P0118 in a 2018 GMC Sierra?
The cost of repairing the P0118 code can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor at a dealership or repair shop.
10. Will passing a vehicle emissions test be possible with the OBDII code P0118 in my 2018 GMC Sierra?
Having an unresolved P0118 code may cause your vehicle to fail an emissions test, as it signifies a problem with the engine's coolant temperature circuit.
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