AutoCodes – GMC – P242C 2014 GMC Sierra

P242C 2014 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 2014 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.

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Code Popularity 185

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 P242C 2014 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 2014 GMC Sierra - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P242C 2014 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P242C 2014 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 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P242C 2014 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 P242C 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P242C in a 2014 GMC Sierra?

The common symptoms of code P242C include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light on the dashboard.

2. What does the OBDII code P242C on a 2014 GMC Sierra indicate?

Code P242C indicates an issue with the Exhaust Gas Temperature Sensor 3 Circuit, specifically low voltage being detected.

3. What are the possible causes of OBDII code P242C in a 2014 GMC Sierra?

Possible causes of code P242C include a faulty Exhaust Gas Temperature Sensor 3, wiring issues in the sensor circuit, or a problem with the engine control module.

4. How can I diagnose the OBDII code P242C in my 2014 GMC Sierra?

Diagnosing code P242C involves using an OBDII scanner to retrieve the code, checking the wiring and connections of the Exhaust Gas Temperature Sensor 3, and testing the sensor itself for proper function.

5. Is it safe to continue driving with OBDII code P242C in a 2014 GMC Sierra?

It is not recommended to continue driving with code P242C present, as it can lead to further damage to the engine or emissions system. It is best to address the issue promptly.

6. Can I repair OBDII code P242C in my 2014 GMC Sierra myself?

Depending on your skill level and access to tools, you may be able to repair code P242C yourself by replacing the Exhaust Gas Temperature Sensor 3 or fixing any wiring issues. However, professional assistance is recommended for accurate diagnosis and repair.

7. How much does it cost to fix OBDII code P242C in a 2014 GMC Sierra?

The cost of fixing code P242C can vary depending on the root cause of the issue. Replacing the Exhaust Gas Temperature Sensor 3 or addressing wiring problems may cost a few hundred dollars at a repair shop.

8. Will resetting the check engine light clear OBDII code P242C in my 2014 GMC Sierra?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing code P242C is not addressed, the code is likely to return. It's important to diagnose and fix the problem to prevent further issues.

9. How long does it take to repair OBDII code P242C in a 2014 GMC Sierra?

The repair time for code P242C can vary based on the exact cause of the issue and the complexity of the repair. In general, it may take a few hours to diagnose and fix the problem.

10. Can OBDII code P242C in a 2014 GMC Sierra cause damage if left untreated?

Leaving code P242C untreated can potentially cause damage to the engine or emissions system over time. It's best to address the issue promptly to prevent further complications.