P118F 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running
Quick Answer
The P118F diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically refers to an issue with the Exhaust Gas Temperature (EGT) Sensor 2 performance while the engine is running. Common causes include Faulty EGT Sensor 2: The sensor itself may be malfunctioning or failed, causing inaccurate temperature readings, Wiring Issues: Damaged or corroded wiring connecting the EGT Sensor 2 to the ECM can disrupt the signal and trigger the P118F code, ECM Malfunction: A problem with the engine control module can prevent it from receiving or interpreting data from the EGT Sensor 2 correctly. 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
- P118F 2017 GMC Sierra indicates Exhaust Gas Temperature Sensor 2 Performance Engine Running.
- Common causes
- Common causes include Faulty EGT Sensor 2: The sensor itself may be malfunctioning or failed, causing inaccurate temperature readings, Wiring Issues: Damaged or corroded wiring connecting the EGT Sensor 2 to the ECM can disrupt the signal and trigger the P118F code, ECM Malfunction: A problem with the engine control module can prevent it from receiving or interpreting data from the EGT Sensor 2 correctly.
- 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 P118F 2017 GMC Sierra Description
The P118F diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically refers to an issue with the Exhaust Gas Temperature (EGT) Sensor 2 performance while the engine is running. This sensor is responsible for monitoring the exhaust gas temperature to ensure optimal engine performance and emissions control. When this sensor malfunctions or fails to operate correctly, it can lead to a variety of performance issues in the vehicle.
Common Causes of P118F 2017 GMC Sierra
- Faulty EGT Sensor 2: The sensor itself may be malfunctioning or failed, causing inaccurate temperature readings.
- Wiring Issues: Damaged or corroded wiring connecting the EGT Sensor 2 to the ECM can disrupt the signal and trigger the P118F code.
- ECM Malfunction: A problem with the engine control module can prevent it from receiving or interpreting data from the EGT Sensor 2 correctly.
- Exhaust System Leak: A leak in the exhaust system can affect the EGT Sensor 2 readings and trigger the code.
Symptoms of P118F 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with the P118F code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Engine Performance: The vehicle may experience a decrease in power and acceleration due to incorrect engine adjustments.
- Poor Fuel Efficiency: A malfunctioning EGT Sensor 2 can lead to inefficient fuel combustion, resulting in decreased fuel economy.
- Rough Idle: The engine may run erratically or have a rough idle when the EGT Sensor 2 is not functioning correctly.
How to Fix P118F 2017 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the specific DTC and pinpoint the cause of the problem.
- Inspect EGT Sensor 2: Check the sensor for any visible damage or signs of malfunction. Replace if necessary.
- Check Wiring: Inspect the wiring harness for any damage, corrosion, or loose connections. Repair or replace as needed.
- Test ECM: Verify that the engine control module is functioning correctly and receiving data from the EGT Sensor 2.
- Clear DTCs: After completing the repair, clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P118F 2017 GMC Sierra
The typical repair costs for addressing a P118F code on a 2017 GMC Sierra can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can vary based on factors such as the location of the repair shop, the specific make and model of the vehicle, and the extent of the issue. Additionally, diagnosis 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 and lower at independent shops. For a more accurate estimate, it's recommended to inquire with local repair shops.
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Frequently Asked Questions about P118F 2017 GMC Sierra Code
1. What does the OBDII code P118F mean on a 2017 GMC Sierra?
P118F indicates an issue with the performance of Exhaust Gas Temperature (EGT) Sensor 2 while the engine is running, often related to improper temperature readings.
2. What are the symptoms of code P118F on a 2017 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced engine performance, poor fuel efficiency, or the vehicle entering limp mode.
3. What causes the P118F code to appear?
Potential causes include a faulty EGT sensor, damaged wiring or connectors, excessive soot buildup on the sensor, or issues with the exhaust system.
4. Can I drive my 2017 GMC Sierra with a P118F code?
Driving with this code is not recommended, as it could lead to further damage to the exhaust or emissions system and may cause reduced engine performance.
5. How do I diagnose the P118F code on my GMC Sierra?
Diagnosis involves using a scan tool to confirm the code, inspecting the EGT sensor and its wiring for damage, and testing the sensor for proper function using a multimeter.
6. How do I fix the P118F code on a 2017 GMC Sierra?
Repairs may include replacing the faulty EGT sensor, cleaning soot buildup, repairing damaged wiring or connectors, and addressing any exhaust system issues.
7. How much does it cost to fix a P118F code on a GMC Sierra?
The cost can vary, but replacing an EGT sensor typically ranges from $150 to $300, including parts and labor, depending on your location and mechanic.
8. What is EGT Sensor 2 on a 2017 GMC Sierra?
EGT Sensor 2 measures the temperature of exhaust gases downstream in the exhaust system to help the engine control module (ECM) optimize performance and emissions.
9. Can a P118F code cause long-term damage if ignored?
Yes, ignoring this code can result in damage to the exhaust system, catalytic converter, or diesel particulate filter (DPF), leading to more expensive repairs.
10. Does the P118F code always mean the EGT sensor is faulty?
Not always. It can also be triggered by wiring issues, soot accumulation, or problems with the exhaust system, so proper diagnosis is crucial.
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