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Engine-Codes – GMC – P118F GMC

P118F GMC Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

Quick Answer

The P118F diagnostic trouble code for GMC vehicles indicates a performance issue with the Exhaust Gas Temperature (EGT) Sensor 2 while the engine is running. Common causes include Faulty EGT Sensor 2, Wiring or connector issues, Exhaust system leaks. 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 GMC indicates Exhaust Gas Temperature Sensor 2 Performance Engine Running.
Common causes
Common causes include Faulty EGT Sensor 2, Wiring or connector issues, Exhaust system leaks.
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 14, 2024
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Code P118F GMC Description

The P118F diagnostic trouble code for GMC vehicles indicates a performance issue with the Exhaust Gas Temperature (EGT) Sensor 2 while the engine is running. The EGT sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. This information is crucial for the engine control module (ECM) to adjust fuel delivery and optimize engine performance.

OBDII Code P118F GMC - Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F GMC Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

Common Causes of P118F GMC

  1. Faulty EGT Sensor 2
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. ECM software issues
  5. Exhaust gas recirculation (EGR) system problems

Symptoms of P118F GMC

  1. Decreased fuel efficiency
  2. Loss of power
  3. Rough idling or stalling
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P118F GMC

  1. Diagnose the issue by using a scan tool to monitor EGT Sensor 2 data and check for any related trouble codes.
  2. Inspect the EGT Sensor 2, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Check for exhaust leaks and repair as necessary.
  4. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify the root cause, such as testing the EGR system or updating the ECM software.

Cost to Fix P118F GMC

The cost of repairing a P118F code related to the Exhaust Gas Temperature Sensor 2 performance can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty EGT sensor can range from $100 to $300, including parts and labor. However, additional costs may apply if there are wiring or exhaust system repairs needed. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of your vehicle. Labor rates can vary between $80 and $150 per hour, so it's advisable to inquire about local rates for a more precise cost estimate.

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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 P118F GMC Code

1. What are common symptoms of OBDII code P118F in a GMC vehicle?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine light.

2. What causes the OBDII code P118F Exhaust Gas Temperature Sensor 2 Performance Engine Running in a GMC?

- The code P118F is typically triggered by a faulty exhaust gas temperature sensor, wiring issues, or a problem with the sensor circuit.

3. How can I diagnose the OBDII code P118F in my GMC?

- Diagnosis involves using a scan tool to read the code, checking the exhaust gas temperature sensor for proper operation, and inspecting the sensor wiring for any damage.

4. Can I continue driving my GMC with the OBDII code P118F present?

- It is not recommended to continue driving with the P118F code as it can lead to further engine damage and reduced performance.

5. How do I repair the OBDII code P118F in my GMC?

- Repairing the P118F code may involve replacing the exhaust gas temperature sensor, repairing any damaged wiring, or addressing any underlying issues with the sensor circuit.

6. Are there any tips for preventing the OBDII code P118F from reoccurring in my GMC?

- Regular maintenance, such as checking and replacing sensors as needed, can help prevent the recurrence of the P118F code in your GMC.

7. Can I reset the Check Engine light after fixing the OBDII code P118F in my GMC?

- Yes, the Check Engine light can be reset using a scan tool after the OBDII code P118F has been successfully repaired in your GMC.

8. Is it possible to drive my GMC with a faulty exhaust gas temperature sensor causing the P118F code?

- While it may be possible to drive with a faulty sensor, it is not recommended as it can lead to poor engine performance and potential damage.

9. How long does it typically take to repair the OBDII code P118F in a GMC?

- The repair time for the P118F code can vary depending on the exact cause of the issue, but it may take a few hours to complete the necessary repairs.

10. Will the OBDII code P118F cause my GMC to fail an emissions test?

- Yes, the presence of the P118F code can cause your GMC to fail an emissions test due to the impact on engine performance and emissions control systems.

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