AutoCodes – GMC – P118F 2014 GMC Sierra

P118F 2014 GMC Sierra 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 2014 GMC Sierra 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 568

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 2014 GMC Sierra 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 2014 GMC Sierra - Exhaust Gas Temperature Sensor 2 Performance Engine Running - AutoCodes.com — P118F 2014 GMC Sierra Code - Exhaust Gas Temperature Sensor 2 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P118F 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra code?

Need more information on how to fix the P118F 2014 GMC Sierra code? Get Access to Factory Service Manuals

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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 2014 GMC Sierra Code

1. What does the OBDII code P118F mean on a 2014 GMC Sierra?

P118F indicates a performance issue with Exhaust Gas Temperature (EGT) Sensor 2 while the engine is running, meaning the sensor is not providing accurate readings.

2. What are the symptoms of the P118F code?

Common symptoms include a check engine light, reduced engine performance, poor fuel efficiency, or the vehicle entering limp mode.

3. What causes the P118F code to appear?

Possible causes include a faulty EGT sensor, damaged wiring or connectors, excessive soot buildup on the sensor, or an issue with the exhaust system.

4. Can I drive my 2014 GMC Sierra with the P118F code active?

Itâ€™s not recommended to drive for an extended period with this code, as it can lead to poor performance or damage to the emissions system if not addressed.

5. How do I diagnose the P118F code?

Diagnose the issue by using a scan tool to confirm the code, inspecting the EGT sensor and its wiring for damage, and checking for soot or debris in the exhaust system.

6. How do I fix the P118F code?

Repairs may include replacing the faulty EGT sensor, repairing damaged wiring or connectors, cleaning soot buildup, or addressing any underlying exhaust system issues.

7. Where is Exhaust Gas Temperature Sensor 2 located on a 2014 GMC Sierra?

EGT Sensor 2 is typically located downstream in the exhaust system, often near the diesel particulate filter (DPF) or catalytic converter.

8. What tools are needed to repair the P118F code?

You will need an OBDII scan tool, a multimeter to test wiring, and basic hand tools for sensor replacement. Specialized tools may be required to remove stubborn exhaust components.

9. How much does it cost to fix the P118F code?

Repair costs vary, but replacing an EGT sensor typically ranges from $100 to $300, depending on labor and parts pricing.

10. Can a dirty diesel particulate filter cause the P118F code?

Yes, a clogged DPF can lead to abnormal exhaust temperatures, potentially triggering the P118F code. Itâ€™s important to inspect the DPF during diagnosis.