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Engine-Codes – GMC – P1198 2018 GMC Sierra

P1198 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Performance Engine Running

Quick Answer

The P1198 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically relates to the Exhaust Gas Temperature (EGT) Sensor 5 Performance while the engine is running. Common causes include Faulty EGT 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
P1198 2018 GMC Sierra indicates Exhaust Gas Temperature Sensor 5 Performance Engine Running.
Common causes
Common causes include Faulty EGT 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 Sep 16, 2024
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Code P1198 2018 GMC Sierra Description

The P1198 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically relates to the Exhaust Gas Temperature (EGT) Sensor 5 Performance while the engine is running. This code indicates that the EGT sensor, which is responsible for monitoring the temperature of exhaust gases leaving the engine, is not performing within the expected parameters. The EGT sensor plays a crucial role in ensuring the engine operates efficiently and within safe temperature limits. When this sensor malfunctions or fails to provide accurate data, it can lead to a variety of issues that affect the vehicle's performance, emissions, and overall engine health.

OBDII Code P1198 2018 GMC Sierra - Exhaust Gas Temperature Sensor 5 Performance Engine Running
P1198 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Performance Engine Running

Common Causes of P1198 2018 GMC Sierra

  1. Faulty EGT sensor
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. ECM software issues
  5. Exhaust system blockages

Symptoms of P1198 2018 GMC Sierra

  1. Decreased fuel efficiency
  2. Loss of engine power
  3. Illuminated check engine light
  4. Rough idling or stalling
  5. Increased emissions

How to Fix P1198 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue by using a scan tool to read the DTC and inspecting the EGT sensor, wiring, and connectors for any visible damage or corrosion.
  2. Replace the faulty EGT sensor if it is determined to be the cause of the problem. Ensure the new sensor is compatible with the vehicle's make and model.
  3. Check and repair any damaged wiring or connectors related to the EGT sensor to ensure proper electrical connections.
  4. Inspect the exhaust system for leaks or blockages that may be affecting the EGT sensor's performance. Repair or replace any damaged components as needed.
  5. Clear the DTC from the ECM's memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1198 2018 GMC Sierra

The cost of repairing a P1198 DTC related to the Exhaust Gas Temperature Sensor 5 Performance on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor in your area. In general, the cost of replacing an EGT sensor can range from $100 to $300, while addressing wiring or exhaust system issues may increase the total repair cost. Additionally, labor rates at auto repair shops typically range from $80 to $150 per hour. It's recommended to consult with a professional mechanic to obtain a more accurate estimate based on your vehicle's specific needs and location.

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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 P1198 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P1198 in a 2018 GMC Sierra related to Exhaust Gas Temperature Sensor 5 performance while the engine is running?

The common symptoms include reduced engine performance, poor fuel efficiency, and potential exhaust smoke.

2. What can cause the OBDII code P1198 to trigger in a 2018 GMC Sierra?

Possible causes of code P1198 include a faulty exhaust gas temperature sensor, wiring issues, exhaust system leaks, or problems with the engine's fuel system.

3. How can I diagnose the OBDII code P1198 on a 2018 GMC Sierra?

Diagnosing code P1198 involves using an OBDII scanner to read the code, checking the exhaust gas temperature sensor 5 for proper function, inspecting the wiring for damage, and verifying the exhaust system integrity.

4. Can I drive my 2018 GMC Sierra with OBDII code P1198?

It is not recommended to drive the vehicle with code P1198 as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

5. How can I repair OBDII code P1198 in my 2018 GMC Sierra?

Repairing code P1198 may involve replacing the exhaust gas temperature sensor 5, repairing damaged wiring, fixing exhaust leaks, or addressing any fuel system issues contributing to the problem.

6. Is it possible to reset the OBDII code P1198 in a 2018 GMC Sierra without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is crucial to address the root cause of the problem to prevent the code from reoccurring.

7. Can a DIY enthusiast fix OBDII code P1198 in a 2018 GMC Sierra?

Depending on your skills and tools, some DIY enthusiasts may be able to address code P1198 by replacing the exhaust gas temperature sensor 5 or fixing wiring issues. However, complex diagnosis and repairs may require professional assistance.

8. How much does it cost to repair OBDII code P1198 in a 2018 GMC Sierra?

The cost of repairing code P1198 can vary depending on the underlying issue, parts needed, and labor rates. It is advisable to obtain quotes from reputable mechanics or repair shops.

9. Will OBDII code P1198 cause my 2018 GMC Sierra to fail an emissions test?

Yes, code P1198 can cause your vehicle to fail an emissions test due to its impact on the engine's performance and emissions control system.

10. How urgent is it to address OBDII code P1198 in a 2018 GMC Sierra?

It is recommended to address code P1198 promptly to prevent further damage to the engine or emissions system and ensure optimal vehicle performance and efficiency.

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