AutoCodes – GMC – P118E 2017 GMC Sierra

P118E 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 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: P118E 2017 GMC Sierra indicates Exhaust Gas Temperature Sensor 1 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 281

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 P118E 2017 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 P118E 2017 GMC Sierra - Exhaust Gas Temperature Sensor 1 Performance Engine Running - AutoCodes.com — P118E 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P118E 2017 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 P118E 2017 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 P118E 2017 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 P118E 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

1. What does the OBDII code P118E mean on a 2017 GMC Sierra?

P118E refers to an issue with the Exhaust Gas Temperature (EGT) Sensor 1, indicating a performance problem when the engine is running.

2. What are the symptoms of code P118E in a 2017 GMC Sierra?

Common symptoms include reduced engine performance, poor fuel efficiency, increased emissions, and possibly the Check Engine Light being illuminated.

3. What causes the P118E code to appear?

The code can be triggered by a faulty EGT sensor, damaged wiring or connectors, buildup of soot or debris on the sensor, or an issue with the engine control module (ECM).

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

Yes, soot or carbon buildup on the EGT sensor can cause it to malfunction and trigger the P118E code.

5. How do I fix the P118E code on my 2017 GMC Sierra?

Repairs may involve cleaning or replacing the EGT sensor, repairing damaged wiring or connectors, or updating the ECM software if necessary.

6. Can I drive my 2017 GMC Sierra with the P118E code?

While the vehicle may still be drivable, ignoring this code can lead to reduced performance, higher emissions, and potential damage to the exhaust system.

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

Replacing an EGT sensor typically costs between $150 and $300, including parts and labor, but costs can vary depending on the severity of the issue.

8. How can I diagnose the P118E code on my GMC Sierra?

Use an OBDII scanner to confirm the code, inspect the EGT sensor and its wiring for damage, and check for soot or debris buildup on the sensor.

9. Does the P118E code always mean the EGT sensor is faulty?

Not necessarily. The issue could also stem from wiring, connectors, or a software problem in the ECM.

10. How often should the Exhaust Gas Temperature Sensor be inspected?

Itâ€™s a good idea to inspect the EGT sensor during routine maintenance, especially if your vehicle has high mileage or operates under heavy loads frequently.