AutoCodes – GMC – P242C 2015 GMC Sierra

P242C 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low 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: P242C 2015 GMC Sierra indicates Exhaust Gas Temperature Sensor 3 Circuit Low 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 241

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P242C 2015 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 less than 158 Ω for greater than 2 s.

OBDII Code P242C 2015 GMC Sierra - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P242C 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P242C 2015 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 P242C 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 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 P242C 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 P242C 2015 GMC Sierra code?

Need more information on how to fix the P242C 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P242C 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P242C 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P242C in a 2015 GMC Sierra?

The common symptoms of code P242C include reduced engine performance, decreased fuel efficiency, and illuminated Check Engine Light.

2. What does the OBDII code P242C in a 2015 GMC Sierra indicate?

Code P242C indicates a low voltage condition in the Exhaust Gas Temperature Sensor 3 circuit of the vehicle.

3. What are the possible causes of OBDII code P242C in a 2015 GMC Sierra?

Possible causes of code P242C include a faulty Exhaust Gas Temperature Sensor, damaged wiring or connectors, exhaust system leaks, or a malfunctioning engine control module.

4. How can I diagnose the OBDII code P242C in my 2015 GMC Sierra?

Diagnosing code P242C involves inspecting the Exhaust Gas Temperature Sensor 3, checking the wiring and connectors for damage, verifying the exhaust system for leaks, and using a diagnostic scanner to read live data from the sensor.

5. Can I continue driving my 2015 GMC Sierra with OBDII code P242C?

It is not recommended to continue driving with code P242C as it can lead to decreased engine performance and potential damage to the catalytic converter and other components.

6. What are some repair tips for fixing OBDII code P242C in a 2015 GMC Sierra?

Repair tips for code P242C may include replacing the Exhaust Gas Temperature Sensor 3, repairing damaged wiring or connectors, fixing any exhaust leaks, and clearing the code with a diagnostic scanner.

7. How much does it typically cost to fix OBDII code P242C in a 2015 GMC Sierra?

The cost of fixing code P242C can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Is OBDII code P242C a serious issue in a 2015 GMC Sierra?

While code P242C may not cause immediate breakdown, it should be addressed promptly to prevent further engine damage and ensure optimal vehicle performance.

9. Can I reset the Check Engine Light after fixing OBDII code P242C in my 2015 GMC Sierra?

Once the underlying issue causing code P242C is resolved, the Check Engine Light can be reset using a diagnostic scanner to clear the code and turn off the warning light.

10. How can I prevent OBDII code P242C from recurring in my 2015 GMC Sierra?

Regular maintenance, timely repairs of any exhaust system issues, and keeping an eye on sensor health can help prevent the recurrence of code P242C in your GMC Sierra.