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P242C 2018 Chevrolet Silverado Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Quick Answer

The P242C diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage. Common causes include Faulty Sensor: The most common cause of this code is a malfunctioning exhaust gas temperature sensor 3, which may need to be replaced, Wiring Issues: Damaged or corroded wiring in the sensor's circuit can prevent proper voltage readings, triggering the low voltage code, ECM Malfunction: A problem with the engine control module can also lead to incorrect voltage readings from the sensor. 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 2018 Chevrolet Silverado indicates Exhaust Gas Temperature Sensor 3 Circuit Low Voltage.
Common causes
Common causes include Faulty Sensor: The most common cause of this code is a malfunctioning exhaust gas temperature sensor 3, which may need to be replaced, Wiring Issues: Damaged or corroded wiring in the sensor's circuit can prevent proper voltage readings, triggering the low voltage code, ECM Malfunction: A problem with the engine control module can also lead to incorrect voltage readings from the sensor.
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 11, 2024
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Code P242C 2018 Chevrolet Silverado Description

The P242C diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage. This code indicates that there is an issue with the exhaust gas temperature sensor's circuit, specifically sensor 3, which is responsible for monitoring the exhaust gas temperature in the exhaust system. The exhaust gas temperature sensor plays a crucial role in helping the engine control module (ECM) adjust fuel injection and timing to optimize engine performance and emissions.

OBDII Code P242C 2018 Chevrolet Silverado - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2018 Chevrolet Silverado Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Common Causes of P242C 2018 Chevrolet Silverado

  1. Faulty Sensor: The most common cause of this code is a malfunctioning exhaust gas temperature sensor 3, which may need to be replaced.
  2. Wiring Issues: Damaged or corroded wiring in the sensor's circuit can prevent proper voltage readings, triggering the low voltage code.
  3. ECM Malfunction: A problem with the engine control module can also lead to incorrect voltage readings from the sensor.
  4. Exhaust System Leak: A leak in the exhaust system can affect the sensor's readings, causing it to report inaccurate data.
  5. Environmental Factors: Extreme temperatures or exposure to contaminants can impact the sensor's performance and accuracy.

Symptoms of P242C 2018 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning exhaust gas temperature sensor can lead to decreased fuel efficiency as the engine may not be operating at optimal levels.
  3. Poor Engine Performance: The vehicle may experience rough idling, hesitation, or lack of power when accelerating.
  4. Increased Emissions: A faulty sensor can cause the vehicle to produce higher emissions than normal, potentially causing it to fail emissions tests.
  5. Overheating: In extreme cases, a malfunctioning exhaust gas temperature sensor can lead to engine overheating due to incorrect fuel and timing adjustments.

How to Fix P242C 2018 Chevrolet Silverado

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific code and determine if the problem lies with the exhaust gas temperature sensor 3 or its circuit.
  2. Inspect Wiring: Check the wiring harness connected to the sensor for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Replace Sensor: If the sensor is faulty, it will need to be replaced with a new one that meets the manufacturer's specifications.
  4. Clear Codes: Once the repair is complete, clear the diagnostic trouble codes from the ECM to reset the check engine light.
  5. Test Drive: After repairs are made, take the vehicle for a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P242C 2018 Chevrolet Silverado

The cost of repairing the P242C code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue and the cost of parts and labor in your area. In general, the cost of replacing an exhaust gas temperature sensor can range from $100 to $300, including parts and labor. However, additional costs may apply if wiring repairs or ECM diagnostics are needed. It's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and engine type can also influence repair costs. For a more accurate estimate, it's recommended to consult with a local auto repair shop.

What does this mean?

Tech Notes for P242C 2018 Chevrolet Silverado

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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P242C in a 2018 Chevrolet Silverado?

The common symptoms of code P242C in a 2018 Chevrolet Silverado include reduced engine performance, decreased fuel efficiency, and possible illumination of the check engine light.

2. What can cause the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage error code P242C in a 2018 Chevrolet Silverado?

The P242C code in a 2018 Chevrolet Silverado is typically caused by a malfunctioning exhaust gas temperature sensor, damaged wiring or connectors related to the sensor, or a faulty Engine Control Module (ECM).

3. How can I diagnose the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage code P242C in my 2018 Chevrolet Silverado?

To diagnose code P242C, you can use an OBDII scanner to retrieve the trouble code and perform a visual inspection of the exhaust gas temperature sensor and its wiring. You may also need to test the sensor's resistance and voltage output.

4. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P242C active?

While it may be possible to drive with the P242C code present, it is recommended to address the issue promptly to prevent potential damage to the engine or emissions system. Reduced performance and fuel efficiency may also persist.

5. What are the repair options for fixing the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage code P242C in a 2018 Chevrolet Silverado?

Repair options for resolving code P242C include replacing the faulty exhaust gas temperature sensor, repairing or replacing damaged wiring or connectors, and resetting the ECM to clear the trouble code.

6. Is it possible to reset the check engine light after repairing OBDII code P242C in a 2018 Chevrolet Silverado?

Yes, once you have fixed the underlying issue causing code P242C, you can reset the check engine light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

7. How do I prevent OBDII code P242C from recurring in my 2018 Chevrolet Silverado?

To prevent the recurrence of code P242C, it is essential to ensure regular maintenance of the exhaust gas temperature sensor and associated components. Keeping up with scheduled vehicle inspections can also help catch potential issues early.

8. Can a DIY enthusiast repair OBDII code P242C in a 2018 Chevrolet Silverado?

Depending on your automotive repair skills and access to tools, DIY enthusiasts may be able to address code P242C by replacing the exhaust gas temperature sensor or repairing wiring issues. However, if unsure, it is best to seek professional assistance.

9. How long does it typically take to repair OBDII code P242C in a 2018 Chevrolet Silverado?

The repair time for code P242C can vary based on the extent of the issue and the availability of parts. In general, replacing the exhaust gas temperature sensor or repairing wiring connections can be completed within a few hours.

10. Will fixing OBDII code P242C improve the overall performance of my 2018 Chevrolet Silverado?

Yes, resolving code P242C and ensuring proper functioning of the exhaust gas temperature sensor can help improve engine performance, fuel efficiency, and overall drivability of your 2018 Chevrolet Silverado.

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