AutoCodes – GMC – P1198 2017 GMC Sierra

P1198 2017 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 2017 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 242

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 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 P1198 2017 GMC Sierra - Exhaust Gas Temperature Sensor 5 Performance Engine Running - AutoCodes.com — P1198 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P1198 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 P1198 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 P1198 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 P1198 2017 GMC Sierra code?

Need more information on how to fix the P1198 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P1198 2017 GMC Sierra Code

1. What does the OBDII code P1198 mean on a 2017 GMC Sierra?

P1198 indicates an issue with the performance of Exhaust Gas Temperature (EGT) Sensor 5 while the engine is running, signaling that the sensor's readings are outside the expected range.

2. What are the symptoms of code P1198 in a 2017 GMC Sierra?

Common symptoms include reduced fuel efficiency, poor engine performance, the Check Engine Light turning on, and potentially entering limp mode.

3. What causes code P1198 to appear?

The main causes can include a faulty Exhaust Gas Temperature Sensor 5, damaged wiring or connectors, soot buildup on the sensor, or issues with the engine control module (ECM).

4. How can I fix the P1198 code on my GMC Sierra?

Inspect and clean the EGT sensor, check for damaged wiring or connectors, and replace the sensor if necessary. If the issue persists, have the ECM tested by a professional.

5. Can I drive my 2017 GMC Sierra with code P1198?

Driving with this code is not recommended as it may lead to reduced engine performance, higher emissions, and potential damage to the exhaust or turbo systems.

6. Where is Exhaust Gas Temperature Sensor 5 located on a 2017 GMC Sierra?

EGT Sensor 5 is typically located in the exhaust system, downstream of the turbocharger or near the diesel particulate filter (DPF).

7. How much does it cost to repair code P1198?

Repair costs can vary, but replacing the EGT sensor generally costs between $150 and $300, including parts and labor.

8. Can a dirty Exhaust Gas Temperature Sensor cause code P1198?

Yes, soot or carbon buildup on the sensor can affect its performance and trigger the P1198 code.

9. Do I need to replace the ECM if I have code P1198?

Replacing the ECM is rarely necessary for this code. Start by addressing the EGT sensor and wiring issues before considering ECM replacement.

10. How do I prevent the P1198 code from occurring again?

Regular maintenance, including cleaning or inspecting the exhaust system and sensors, can help prevent soot buildup and wiring issues that lead to this code.