P0117 2018 GMC Sierra Code - Engine Coolant Temperature Circuit Low Input
Quick Answer
The P0117 code for a 2018 GMC Sierra indicates an issue with the Engine Coolant Temperature (ECT) Circuit registering a low input. Common causes include Faulty ECT Sensor: The most common cause of the P0117 code is a malfunctioning ECT sensor that provides incorrect temperature readings, Wiring Issues: Damaged or corroded wiring connecting the ECT sensor to the ECM can disrupt the signal transmission, ECM Malfunction: A problem with the engine control module can prevent it from accurately interpreting the signals from the 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
- P0117 2018 GMC Sierra indicates Engine Coolant Temperature Circuit Low Input.
- Common causes
- Common causes include Faulty ECT Sensor: The most common cause of the P0117 code is a malfunctioning ECT sensor that provides incorrect temperature readings, Wiring Issues: Damaged or corroded wiring connecting the ECT sensor to the ECM can disrupt the signal transmission, ECM Malfunction: A problem with the engine control module can prevent it from accurately interpreting the signals from the 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.
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Code P0117 2018 GMC Sierra Description
The P0117 code for a 2018 GMC Sierra indicates an issue with the Engine Coolant Temperature (ECT) Circuit registering a low input. The ECT sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM) to regulate fuel injection and ignition timing. When the ECT sensor reports a low input, it means that the temperature reading is below the expected range, which can lead to various performance issues.
Common Causes of P0117 2018 GMC Sierra
- Faulty ECT Sensor: The most common cause of the P0117 code is a malfunctioning ECT sensor that provides incorrect temperature readings.
- Wiring Issues: Damaged or corroded wiring connecting the ECT sensor to the ECM can disrupt the signal transmission.
- ECM Malfunction: A problem with the engine control module can prevent it from accurately interpreting the signals from the ECT sensor.
- Low Coolant Level: Insufficient coolant in the system can also cause the ECT sensor to register low temperatures inaccurately.
- Cooling System Problems: Issues with the cooling system, such as a faulty thermostat or water pump, can affect the ECT sensor readings.
Symptoms of P0117 2018 GMC Sierra
- Check Engine Light: The most common symptom associated with the P0117 code is the illumination of the check engine light on the vehicle's dashboard.
- Poor Fuel Economy: The engine running rich due to incorrect temperature readings can lead to decreased fuel efficiency.
- Rough Idle: Incorrect fuel mixture and ignition timing can cause the engine to idle roughly or inconsistently.
- Engine Overheating: In some cases, the ECT sensor may fail to register high temperatures, leading to engine overheating.
- Difficulty Starting: A faulty ECT sensor can also cause difficulties starting the engine, especially in cold weather conditions.
How to Fix P0117 2018 GMC Sierra
- Diagnose the Issue: Begin by using a scan tool to read the code and identify the specific cause of the low input from the ECT sensor.
- Inspect ECT Sensor: Check the ECT sensor for any visible damage or signs of wear, and test its functionality using a multimeter.
- Check Wiring: Inspect the wiring harness connecting the ECT sensor to the ECM for any damage or corrosion, and repair or replace as needed.
- Replace ECT Sensor: If the sensor is found to be faulty, replace it with a new, OEM-equivalent sensor to ensure accurate temperature readings.
- Clear Codes: After completing the repair, clear the diagnostic trouble codes (DTCs) using a scan tool and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0117 2018 GMC Sierra
The typical repair costs for addressing a P0117 code on a 2018 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new ECT sensor, any necessary wiring repairs, and the labor involved in diagnosing and fixing the problem. It's important to note that actual repair costs can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. Additionally, diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. For a more accurate estimate, it's recommended to contact local auto repair shops for pricing information.
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