AutoCodes – GMC – P118F GMC

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

Quick Answer

The exhaust gas temperature sensors are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor circuit poor electrical connection. 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 Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor circuit poor electrical connection.
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 Popularity 543

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P118F GMC Description

The exhaust gas temperature sensors are variable resistors that measure the temperature of the exhaust gas. The exhaust temperature sensor 1 is the first exhaust temperature sensor on the exhaust system, the following exhaust temperature sensors are counted upward from the engine outlet to the exhaust system end. The Engine Control Module (ECM) supplies 5 V to the exhaust gas temperature signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature sensor temperature information is used by the ECM during the exhaust gas particulate filter cleaning process. The Diagnostic Trouble Code (DTC) will be set if the ECM detects that the difference between measured exhaust gas temperature and the estimated exhaust gas temperature is greater than a calibrated amount for greater than 1 s.

OBDII Code P118F GMC - Exhaust Gas Temperature Sensor 2 Performance Engine Running - AutoCodes.com — P118F GMC Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P118F GMC?

Faulty Exhaust Gas Temperature Sensor
Exhaust Gas Temperature Sensor harness is open or shorted
Exhaust Gas Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P118F GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P118F GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P118F GMC code?

Need more information on how to fix the P118F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P118F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P118F 2014 GMC Sierra — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F 2015 GMC Sierra — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F 2016 GMC Sierra — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F 2017 GMC Sierra — Exhaust Gas Temperature Sensor 2 Performance Engine Running
P118F 2018 GMC Sierra — Exhaust Gas Temperature Sensor 2 Performance Engine Running

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.