P0118 2015 GMC Sierra Code - Engine Coolant Temperature Circuit High Input
Quick Answer
The P0118 code for a 2015 GMC Sierra indicates that there is a high input signal from the engine coolant temperature (ECT) sensor circuit. Common causes include Faulty ECT sensor, Damaged ECT sensor wiring harness, Malfunctioning ECM. 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 2015 GMC Sierra indicates Engine Coolant Temperature Circuit High Input.
- Common causes
- Common causes include Faulty ECT sensor, Damaged ECT sensor wiring harness, Malfunctioning ECM.
- 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 2015 GMC Sierra Description
The P0118 code for a 2015 GMC Sierra indicates that there is a high input signal from the engine coolant temperature (ECT) sensor 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 circuit, it means that the engine coolant temperature is higher than the normal operating range.
Common Causes of P0118 2015 GMC Sierra
- Faulty ECT sensor
- Damaged ECT sensor wiring harness
- Malfunctioning ECM
- Low coolant level
- Stuck thermostat
Symptoms of P0118 2015 GMC Sierra
- Engine overheating
- Poor fuel efficiency
- Rough idling or stalling
- Check Engine Light illuminated
- Reduced engine performance
How to Fix P0118 2015 GMC Sierra
- Begin by checking the coolant level and ensuring it is at the proper level.
- Inspect the ECT sensor and its wiring harness for any visible damage or corrosion.
- Test the ECT sensor using a multimeter to determine if it is functioning correctly.
- If the ECT sensor is faulty, replace it with a new one.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0118 2015 GMC Sierra
The cost of repairing a P0118 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty ECT sensor can cost between $50 and $150, while repairing a damaged wiring harness or addressing a cooling system problem can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific diagnosis and repair needed for your vehicle.
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