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Engine-Codes – GMC – P242C 2015 GMC Sierra

P242C 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Quick Answer

The P242C diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically relates to the Exhaust Gas Temperature (EGT) Sensor 3 Circuit registering a low voltage. Common causes include Faulty EGT sensor, Wiring or connector issues in the EGT sensor circuit, Corrosion or damage to the sensor connector. 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 EGT sensor, Wiring or connector issues in the EGT sensor circuit, Corrosion or damage to the sensor connector.
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 29, 2024
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Code P242C 2015 GMC Sierra Description

The P242C diagnostic trouble code (DTC) for a 2015 GMC Sierra specifically relates to the Exhaust Gas Temperature (EGT) Sensor 3 Circuit registering a low voltage. This sensor is responsible for monitoring the temperature of the exhaust gas as it exits the engine. The EGT sensor plays a crucial role in ensuring the engine operates within safe temperature limits, as excessively high exhaust gas temperatures can lead to engine damage or even failure.

OBDII Code P242C 2015 GMC Sierra - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2015 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Common Causes of P242C 2015 GMC Sierra

  1. Faulty EGT sensor.
  2. Wiring or connector issues in the EGT sensor circuit.
  3. Corrosion or damage to the sensor connector.
  4. Exhaust system leaks affecting sensor readings.
  5. ECM software issues.

Symptoms of P242C 2015 GMC Sierra

  1. Check engine light illuminated on the dashboard.
  2. Decreased engine performance or power.
  3. Poor fuel efficiency.
  4. Rough idling or stalling.
  5. Increased emissions.

How to Fix P242C 2015 GMC Sierra

  1. Begin by diagnosing the specific cause of the low voltage reading, which may involve using a multimeter to test the EGT sensor and its circuit.
  2. Inspect the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Check for exhaust leaks that could be affecting sensor readings and repair them accordingly.
  4. If the EGT sensor itself is faulty, replace it with a new sensor that meets manufacturer specifications.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P242C 2015 GMC Sierra

The cost of repairing a P242C code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor in your area. In general, replacing an EGT sensor can range from $100 to $300, with additional costs for any necessary wiring repairs or diagnostic work. Labor costs at auto repair shops typically range from $80 to $150 per hour. It's recommended to obtain quotes from local shops to get a more accurate estimate for your specific situation.

What does this mean?

Tech Notes for P242C 2015 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 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.

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