AutoCodes – GMC – P1198 2018 GMC Sierra

P1198 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 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: P1198 2018 GMC Sierra indicates Exhaust Gas Temperature Sensor 5 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 359

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 P1198 2018 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 P1198 2018 GMC Sierra - Exhaust Gas Temperature Sensor 5 Performance Engine Running - AutoCodes.com — P1198 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P1198 2018 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 P1198 2018 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 P1198 2018 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 P1198 2018 GMC Sierra code?

Need more information on how to fix the P1198 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1198 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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.