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Engine-Codes – GMC – P118E GMC

P118E GMC Code - Exhaust Gas Temperature Sensor 1 Performance Engine Running

Quick Answer

The P118E GMC diagnostic trouble code (DTC) refers to a performance issue with the Exhaust Gas Temperature (EGT) Sensor 1 while the engine is running. Common causes include Faulty EGT Sensor: The EGT sensor itself may be malfunctioning or have failed, causing the ECM to detect a performance issue, Wiring Issues: Loose, damaged, or corroded wiring connections to the EGT sensor can disrupt its signal to the ECM, Exhaust System Leak: A leak in the exhaust system before the EGT sensor can affect its readings and trigger this code. 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
P118E GMC indicates Exhaust Gas Temperature Sensor 1 Performance Engine Running.
Common causes
Common causes include Faulty EGT Sensor: The EGT sensor itself may be malfunctioning or have failed, causing the ECM to detect a performance issue, Wiring Issues: Loose, damaged, or corroded wiring connections to the EGT sensor can disrupt its signal to the ECM, Exhaust System Leak: A leak in the exhaust system before the EGT sensor can affect its readings and trigger this code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P118E GMC Description

The P118E GMC diagnostic trouble code (DTC) refers to a performance issue with the Exhaust Gas Temperature (EGT) Sensor 1 while the engine is running. This sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. The EGT sensor helps the engine control module (ECM) adjust fuel mixture and timing for optimal performance and emissions control.

OBDII Code P118E GMC - Exhaust Gas Temperature Sensor 1 Performance Engine Running
P118E GMC Code - Exhaust Gas Temperature Sensor 1 Performance Engine Running

Common Causes of P118E GMC

  1. Faulty EGT Sensor: The EGT sensor itself may be malfunctioning or have failed, causing the ECM to detect a performance issue.
  2. Wiring Issues: Loose, damaged, or corroded wiring connections to the EGT sensor can disrupt its signal to the ECM.
  3. Exhaust System Leak: A leak in the exhaust system before the EGT sensor can affect its readings and trigger this code.
  4. ECM Malfunction: A fault in the engine control module can incorrectly interpret data from the EGT sensor, leading to this code.

Symptoms of P118E GMC

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Reduced Engine Performance: The engine may experience reduced power, hesitation, or stalling due to incorrect fuel mixture and timing adjustments.
  3. Increased Emissions: The vehicle may fail emissions tests due to the improper functioning of the EGT sensor.
  4. Rough Idle: The engine may idle roughly or inconsistently as a result of the performance issue with the EGT sensor.

How to Fix P118E GMC

  1. Diagnose the Issue: Use a scan tool to retrieve the specific DTC and pinpoint the problem with the EGT sensor.
  2. Inspect Wiring: Check all wiring connections to the EGT sensor for damage, corrosion, or looseness and repair as needed.
  3. Replace EGT Sensor: If the sensor is faulty, replace it with a new, OEM-quality sensor to ensure proper function.
  4. Clear Codes: After completing the repair, clear the DTCs from the ECM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P118E GMC

The typical repair costs for addressing a P118E GMC code can vary depending on the specific cause of the issue. Replacement EGT sensors can range from $50 to $150, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may range from $150 to $350. It's important to note that labor rates and parts prices can vary based on location, vehicle make and model, and the repair shop's hourly rates. Be sure to consult with a certified mechanic or auto repair shop for an accurate estimate based on your vehicle's needs.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P118E GMC Code

1. What are the common symptoms of OBDII code P118E GMC?

- Common symptoms of P118E GMC may include the check engine light coming on, reduced engine performance, and increased fuel consumption.

2. What are the potential causes of OBDII code P118E GMC?

- The code P118E GMC is typically triggered by issues with the exhaust gas temperature sensor 1, such as sensor failure, wiring problems, or a faulty connection.

3. How can I diagnose the OBDII code P118E GMC?

- To diagnose P118E GMC, you can use an OBDII scanner to retrieve the trouble codes, then inspect the exhaust gas temperature sensor 1 and its wiring for any visible damage or issues.

4. Can a faulty exhaust gas temperature sensor cause code P118E GMC?

- Yes, a faulty exhaust gas temperature sensor 1 can trigger code P118E GMC as the sensor is responsible for monitoring the exhaust gas temperature and its performance.

5. How do I repair OBDII code P118E GMC?

- Repairing P118E GMC typically involves replacing the exhaust gas temperature sensor 1 if it is found to be faulty. Ensure proper installation and secure connection to fix the issue.

6. Are there any DIY tips for troubleshooting code P118E GMC?

- DIY tips for troubleshooting P118E GMC include checking the sensor's wiring for any damage, ensuring proper connections, and clearing the code after sensor replacement.

7. Can driving with OBDII code P118E GMC cause further damage to the vehicle?

- While driving with P118E GMC may not immediately harm your vehicle, it is recommended to address the issue promptly to prevent potential long-term damage to the engine or emissions system.

8. How much does it cost to repair OBDII code P118E GMC at a mechanic?

- The cost to repair P118E GMC at a mechanic can vary depending on the labor rates and parts costs, but it typically ranges from $150 to $300 for sensor replacement and diagnostic services.

9. Will resetting the OBDII code P118E GMC make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing P118E GMC is not fixed, the code is likely to reappear once the vehicle is driven again.

10. Is it safe to continue driving my vehicle with OBDII code P118E GMC?

- While it may be safe to drive with P118E GMC in the short term, it is recommended to address the issue promptly to prevent potential performance issues and ensure the vehicle's proper functioning.

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