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Engine-Codes – GMC – P118E 2014 GMC Sierra

P118E 2014 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Performance Engine Running

Quick Answer

The P118E diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Exhaust Gas Temperature Sensor 1 Performance Engine Running. Common causes include Faulty exhaust gas temperature sensor, 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
P118E 2014 GMC Sierra indicates Exhaust Gas Temperature Sensor 1 Performance Engine Running.
Common causes
Common causes include Faulty exhaust gas temperature sensor, 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 Aug 19, 2024
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Code P118E 2014 GMC Sierra Description

The P118E diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Exhaust Gas Temperature Sensor 1 Performance Engine Running. This code indicates that there is a problem with the performance of the exhaust gas temperature sensor while the engine is running. The exhaust gas temperature sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. This information is crucial for the engine management system to adjust fuel injection and timing for optimal performance and emissions control.

OBDII Code P118E 2014 GMC Sierra - Exhaust Gas Temperature Sensor 1 Performance Engine Running
P118E 2014 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Performance Engine Running

Common Causes of P118E 2014 GMC Sierra

  1. Faulty exhaust gas temperature sensor
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. Engine overheating
  5. ECM (Engine Control Module) malfunction

Symptoms of P118E 2014 GMC Sierra

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling
  4. Check Engine Light illuminated
  5. Poor acceleration

How to Fix P118E 2014 GMC Sierra

  1. Diagnose the issue by using a scan tool to read the code and check the exhaust gas temperature sensor's readings.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Replace the exhaust gas temperature sensor if it is found to be faulty.
  4. Repair any wiring or connector issues.
  5. Clear the code and test drive the vehicle to ensure the problem has been resolved.

Cost to Fix P118E 2014 GMC Sierra

The typical cost to repair a P118E code on a 2014 GMC Sierra can range from $150 to $300, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that prices can vary significantly based on location, vehicle make and model, and the complexity of the repair. Be sure to consult with a qualified mechanic for a more accurate estimate.

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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 P118E 2014 GMC Sierra Code

1. What does the OBDII code P118E mean on a 2014 GMC Sierra?

P118E indicates a performance issue with Exhaust Gas Temperature (EGT) Sensor 1 while the engine is running. This sensor monitors exhaust temperatures to help regulate emissions and engine performance.

2. What are the common symptoms of a P118E code?

Symptoms may include an illuminated check engine light, poor fuel economy, reduced engine performance, or the vehicle entering limp mode.

3. What causes a P118E code to appear?

Common causes include a faulty EGT sensor, damaged wiring or connectors, soot buildup on the sensor, or issues with the engine control module (ECM).

4. Can I drive with a P118E code on my GMC Sierra?

While the vehicle may still be drivable, driving with this code can lead to reduced performance and potential damage to the exhaust system or catalytic converter.

5. How do you diagnose a P118E code?

Diagnosis involves using a scan tool to confirm the code, inspecting the EGT sensor and wiring for damage, and testing the sensor's resistance and signal output.

6. How do you fix a P118E code on a 2014 GMC Sierra?

Repairs may include replacing the faulty EGT sensor, cleaning soot buildup, repairing damaged wiring or connectors, or reprogramming the ECM if necessary.

7. How much does it cost to fix a P118E code?

The cost varies, but replacing an EGT sensor typically costs $100–$300, including parts and labor. Wiring repairs or ECM reprogramming may increase the expense.

8. Can a dirty EGT sensor trigger a P118E code?

Yes, soot or carbon buildup on the sensor can cause inaccurate readings, leading to a P118E code.

9. How can I prevent the P118E code from returning?

Regular maintenance, such as cleaning the exhaust system and checking sensor connections, can help prevent future issues with the EGT sensor.

10. Does the P118E code affect emissions testing?

Yes, a P118E code can cause your vehicle to fail an emissions test due to improper exhaust temperature regulation.

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