AutoCodes – GMC – P1198 2015 GMC Sierra

P1198 2015 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 2015 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 205

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 2015 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 2015 GMC Sierra - Exhaust Gas Temperature Sensor 5 Performance Engine Running - AutoCodes.com — P1198 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P1198 2015 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 2015 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 2015 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 2015 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 P1198 2015 GMC Sierra Code

1. What does the OBDII code P1198 mean on a 2015 GMC Sierra?

P1198 indicates an issue with Exhaust Gas Temperature (EGT) Sensor 5, specifically related to its performance while the engine is running.

2. What are the symptoms of code P1198 on a 2015 GMC Sierra?

Common symptoms include reduced engine performance, poor fuel efficiency, excessive emissions, and the illumination of the check engine light.

3. What causes code P1198 on a 2015 GMC Sierra?

Potential 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 my 2015 GMC Sierra with a P1198 code?

Itâ€™s not recommended to drive for extended periods with this code, as it can lead to increased emissions, reduced performance, and potential damage to the exhaust or engine systems.

5. How do you diagnose a P1198 code on a 2015 GMC Sierra?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the EGT sensor and wiring, and testing the sensorâ€™s resistance and voltage output as specified by the manufacturer.

6. How do you fix a P1198 code on a 2015 GMC Sierra?

Repairs may involve replacing the EGT sensor, cleaning soot buildup, repairing damaged wiring, or updating/reprogramming the ECM if necessary.

7. Where is Exhaust Gas Temperature Sensor 5 located on a 2015 GMC Sierra?

Sensor 5 is typically located downstream in the exhaust system, often near or after the diesel particulate filter (DPF), depending on the engine configuration.

8. How much does it cost to fix a P1198 code on a 2015 GMC Sierra?

Repair costs can vary but generally range from $150 to $400, depending on whether the sensor or wiring needs replacement.

9. Can a dirty EGT sensor cause code P1198?

Yes, soot or debris buildup on the sensor can cause incorrect readings, leading to a P1198 code.

10. Will clearing the P1198 code fix the problem?

Clearing the code without addressing the underlying issue will likely cause the code to return. Proper diagnosis and repair are necessary to resolve it.