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Engine-Codes – GMC – P242C 2014 GMC Sierra

P242C 2014 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Quick Answer

The P242C diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Exhaust Gas Temperature (EGT) Sensor 3 Circuit, specifically a low voltage condition. Common causes include Faulty EGT sensor, Wiring or connector issues, Exhaust system leaks. 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 EGT sensor, Wiring or connector issues, Exhaust system leaks.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P242C 2014 GMC Sierra Description

The P242C diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Exhaust Gas Temperature (EGT) Sensor 3 Circuit, specifically a low voltage condition. The EGT sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. This information is crucial for the engine control module (ECM) to adjust fuel delivery and optimize engine performance.

OBDII Code P242C 2014 GMC Sierra - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2014 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Common Causes of P242C 2014 GMC Sierra

  1. Faulty EGT sensor
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. ECM software issues
  5. Exhaust gas recirculation (EGR) system problems

Symptoms of P242C 2014 GMC Sierra

  1. Check engine light illuminated
  2. Reduced engine power
  3. Poor fuel economy
  4. Rough idling or stalling
  5. Increased emissions

How to Fix P242C 2014 GMC Sierra

  1. Begin by diagnosing the EGT sensor using a scan tool to confirm the low voltage condition.
  2. Inspect the wiring and connectors associated with the EGT sensor for any damage or corrosion. Repair or replace as needed.
  3. Check for exhaust leaks that could be affecting the EGT sensor readings. Repair any leaks found.
  4. If the sensor itself is faulty, replace it with a new OEM or high-quality aftermarket sensor.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P242C 2014 GMC Sierra

The cost of repairing a P242C code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the price for a new EGT sensor ranges from $50 to $150, while labor costs can range from $100 to $200. Overall, the total repair cost could fall between $150 and $350. Keep in mind that labor rates and parts prices can vary based on location and the repair shop's rates. It's recommended to obtain quotes from multiple shops to ensure a competitive price.

What does this mean?

Tech Notes for P242C 2014 GMC Sierra

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.

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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.

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