AutoCodes – GMC – P1197 2018 GMC Sierra

P1197 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 4 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: P1197 2018 GMC Sierra indicates Exhaust Gas Temperature Sensor 4 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 223

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 P1197 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 P1197 2018 GMC Sierra - Exhaust Gas Temperature Sensor 4 Performance Engine Running - AutoCodes.com — P1197 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 4 Performance Engine Running

What does this mean?

What are the Possible Causes of the DTC P1197 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 P1197 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 P1197 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 P1197 2018 GMC Sierra code?

Need more information on how to fix the P1197 2018 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 P1197 2018 GMC Sierra Code

1. What does the OBDII code P1197 mean on a 2018 GMC Sierra?

P1197 indicates an issue with the performance of Exhaust Gas Temperature (EGT) Sensor 4 while the engine is running. It suggests the sensor may be malfunctioning or not providing accurate data.

2. What are the symptoms of code P1197 in a 2018 GMC Sierra?

Common symptoms include a check engine light, reduced fuel efficiency, decreased engine performance, or the vehicle entering limp mode.

3. What causes code P1197 on a 2018 GMC Sierra?

Potential causes include a faulty EGT Sensor 4, damaged wiring or connectors, soot buildup on the sensor, or an exhaust leak near the sensor.

4. Can I drive my 2018 GMC Sierra with code P1197?

While it may be possible to drive, itâ€™s not recommended. Ignoring the issue can lead to increased emissions, reduced fuel efficiency, or further damage to the exhaust system.

5. How do I diagnose code P1197 on my 2018 GMC Sierra?

Use a scan tool to confirm the code, inspect the wiring and connectors for damage, check for soot or debris on the EGT sensor, and test the sensorâ€™s resistance and voltage readings.

6. How can I fix code P1197 on a 2018 GMC Sierra?

Repairs may involve cleaning or replacing the EGT Sensor 4, fixing damaged wiring or connectors, removing exhaust restrictions, or addressing any leaks in the exhaust system.

7. What is the location of Exhaust Gas Temperature Sensor 4 on a 2018 GMC Sierra?

EGT Sensor 4 is typically located downstream in the exhaust system, often near the diesel particulate filter (DPF) in diesel models. Refer to a service manual for the exact location.

8. How much does it cost to repair code P1197 on a 2018 GMC Sierra?

The cost can range from $100 to $300 for parts and labor if replacing the sensor. Additional repairs for wiring or exhaust leaks may increase costs.

9. Can a dirty diesel particulate filter (DPF) cause code P1197?

Yes, a clogged or malfunctioning DPF can affect exhaust flow and sensor performance, potentially triggering this code.

10. Will clearing the P1197 code fix the issue permanently?

Clearing the code without addressing the underlying issue will only temporarily turn off the check engine light. The code is likely to return unless the root cause is resolved.