AutoCodes – GMC – P242D 2017 GMC Sierra

P242D 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

Quick Answer

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted, Exhaust Gas Temperature Sensor 3 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: P242D 2017 GMC Sierra indicates Exhaust Gas Temperature Sensor 3 Circuit High Voltage.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted, Exhaust Gas Temperature Sensor 3 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 207

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 Jul 03, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P242D 2017 GMC Sierra Description

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Exhaust temperature sensor 1 is the first exhaust temperature sensor in 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 ve set when the ECM detects that the exhaust gas temperature sensor is greater than 900 Ω for greater than 2 s.

OBDII Code P242D 2017 GMC Sierra - Exhaust Gas Temperature Sensor 3 Circuit High Voltage - AutoCodes.com — P242D 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P242D 2017 GMC Sierra?

Faulty Exhaust Gas Temperature Sensor (EGTS) 3
Exhaust Gas Temperature Sensor 3 harness is open or shorted
Exhaust Gas Temperature Sensor 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P242D 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 does this mean?

Code Tech Notes

After starting the engine, the exhaust gas temperature sensor temperature should rise steadily, then stabilize after the engine reaches operating temperature. Exhaust gas temperature sensors may fail intermittently while operating under extreme temperatures. Review the Freeze Frame/Failure Records to verify the failure criteria.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P242D 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 P242D 2017 GMC Sierra code?

Need more information on how to fix the P242D 2017 GMC Sierra code? Get Access to Factory Service Manuals

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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 P242D 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P242D in a 2017 GMC Sierra?

The common symptoms of code P242D include the Check Engine Light illuminating on the dashboard, reduced engine performance, and potential problems with the exhaust system.

2. What does the OBDII code P242D indicate in a 2017 GMC Sierra?

Code P242D indicates a high voltage condition in the Exhaust Gas Temperature Sensor 3 circuit of a 2017 GMC Sierra, signaling a potential issue with the sensor or its wiring.

3. What are the possible causes of OBDII code P242D in a 2017 GMC Sierra?

Possible causes of code P242D in a 2017 GMC Sierra include a faulty Exhaust Gas Temperature Sensor 3, damaged wiring or connectors related to the sensor, or issues with the sensor circuit.

4. How can I diagnose and repair OBDII code P242D in my 2017 GMC Sierra?

Diagnosing and repairing code P242D involves checking the Exhaust Gas Temperature Sensor 3 and its circuit for faults, testing the sensor's resistance, inspecting the wiring for damage, and replacing any faulty components as needed.

5. Can I continue driving my 2017 GMC Sierra with OBDII code P242D?

It is generally not recommended to continue driving a vehicle with an active OBDII code like P242D, as it can lead to potential engine or exhaust system damage. It is advisable to address the issue promptly.

6. How much does it typically cost to repair OBDII code P242D in a 2017 GMC Sierra?

The cost to repair code P242D in a 2017 GMC Sierra can vary depending on the exact cause of the issue, but it may involve expenses for parts such as the sensor, wiring repairs, and labor charges from a mechanic.

7. Is it possible to reset OBDII code P242D in a 2017 GMC Sierra without repairing the issue?

While you can clear the code using an OBDII scanner, it is essential to diagnose and fix the underlying problem triggering code P242D in a 2017 GMC Sierra to prevent recurring issues.

8. Can a DIY enthusiast repair OBDII code P242D in a 2017 GMC Sierra?

Depending on your automotive skills and tools, you may be able to diagnose and repair code P242D in a 2017 GMC Sierra as it involves sensor and wiring checks. However, professional assistance is recommended for accurate diagnosis.

9. Are there any recalls or technical service bulletins related to OBDII code P242D in a 2017 GMC Sierra?

It is advisable to check with authorized GMC service centers or online databases for any recalls or technical service bulletins specific to OBDII code P242D in a 2017 GMC Sierra to stay informed about related issues.

10. How can I prevent OBDII code P242D from occurring in my 2017 GMC Sierra in the future?

Regular maintenance, including checking the condition of sensors and wiring in the exhaust system, can help prevent issues like code P242D in a 2017 GMC Sierra. Additionally, avoiding rough driving and ensuring timely repairs can contribute to preventing this code.