AutoCodes – GMC – P1198 GMC

P1198 GMC 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 GMC 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 2,485

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

What does this mean?

What are the Possible Causes of the DTC P1198 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

P1198 2014 GMC Sierra — Exhaust Gas Temperature Sensor 5 Performance Engine Running
P1198 2015 GMC Sierra — Exhaust Gas Temperature Sensor 5 Performance Engine Running
P1198 2016 GMC Sierra — Exhaust Gas Temperature Sensor 5 Performance Engine Running
P1198 2017 GMC Sierra — Exhaust Gas Temperature Sensor 5 Performance Engine Running
P1198 2018 GMC Sierra — Exhaust Gas Temperature Sensor 5 Performance Engine Running

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 GMC Code

1. What are the common symptoms of OBDII code P1198 in a GMC vehicle?

The common symptoms of OBDII code P1198 in a GMC vehicle include poor engine performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What does OBDII code P1198 indicate in a GMC vehicle?

OBDII code P1198 in a GMC vehicle indicates a performance issue with Exhaust Gas Temperature Sensor 5 while the engine is running.

3. What are the possible causes of OBDII code P1198 in a GMC vehicle?

Possible causes of OBDII code P1198 in a GMC vehicle include a faulty Exhaust Gas Temperature Sensor 5, wiring issues, sensor circuit problems, or a malfunctioning engine control module.

4. How can I diagnose OBDII code P1198 in my GMC vehicle?

To diagnose OBDII code P1198 in your GMC vehicle, you can use an OBDII scanner to retrieve the specific fault code, inspect the Exhaust Gas Temperature Sensor 5 and its wiring for any visible damage, and perform a continuity test to check for circuit integrity.

5. Can I still drive my GMC vehicle with OBDII code P1198 present?

It is not recommended to drive your GMC vehicle with OBDII code P1198 present, as it can lead to further engine damage and decreased performance. It is advisable to address the issue promptly.

6. How can I repair OBDII code P1198 in my GMC vehicle?

To repair OBDII code P1198 in your GMC vehicle, you may need to replace the Exhaust Gas Temperature Sensor 5, repair any damaged wiring or connections, and clear the fault code using an OBDII scanner.

7. Is it necessary to reset the OBDII code P1198 after making repairs in a GMC vehicle?

Yes, it is important to reset the OBDII code P1198 after making repairs in a GMC vehicle to clear the fault code from the system and ensure proper monitoring of the sensor's performance.

8. Can a DIY enthusiast fix OBDII code P1198 in a GMC vehicle?

Depending on the level of automotive knowledge and experience, a DIY enthusiast may be able to fix OBDII code P1198 in a GMC vehicle by following repair guides, utilizing proper tools, and ensuring safety precautions are in place.

9. What are the long-term effects of ignoring OBDII code P1198 in a GMC vehicle?

Ignoring OBDII code P1198 in a GMC vehicle can lead to decreased engine efficiency, potential damage to engine components, and increased emissions. It is recommended to address the issue promptly to prevent further issues.

10. How can I prevent OBDII code P1198 from occurring in my GMC vehicle?

To prevent OBDII code P1198 from occurring in your GMC vehicle, it is important to perform regular maintenance checks, address any sensor or wiring issues promptly, and follow the manufacturer's recommended service schedule.