Engine-Codes.com
Engine-Codes – Chevrolet – P242D 2018 Chevrolet Silverado

P242D 2018 Chevrolet Silverado Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

Quick Answer

The P242D diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the Exhaust Gas Temperature Sensor 3 Circuit registering a high voltage. Common causes include Faulty Exhaust Gas Temperature Sensor 3: The sensor itself may have failed, leading to inaccurate temperature readings, Wiring Harness Damage: Damage to the wiring harness connecting the sensor to the ECM can cause electrical issues and trigger the high voltage reading, Connector Corrosion: Corrosion or poor connection at the sensor's connector can disrupt the signal and result in the P242D code. 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
P242D 2018 Chevrolet Silverado indicates Exhaust Gas Temperature Sensor 3 Circuit High Voltage.
Common causes
Common causes include Faulty Exhaust Gas Temperature Sensor 3: The sensor itself may have failed, leading to inaccurate temperature readings, Wiring Harness Damage: Damage to the wiring harness connecting the sensor to the ECM can cause electrical issues and trigger the high voltage reading, Connector Corrosion: Corrosion or poor connection at the sensor's connector can disrupt the signal and result in the P242D code.
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 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P242D 2018 Chevrolet Silverado Description

The P242D diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates a problem with the Exhaust Gas Temperature Sensor 3 Circuit registering a high voltage. This sensor is responsible for monitoring the exhaust gas temperature and providing crucial data to the engine control module (ECM) for optimal engine performance and emissions control. When the sensor detects a voltage higher than the specified range, it triggers the P242D code, indicating a potential issue with the sensor or its circuit.

OBDII Code P242D 2018 Chevrolet Silverado - Exhaust Gas Temperature Sensor 3 Circuit High Voltage
P242D 2018 Chevrolet Silverado Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

Common Causes of P242D 2018 Chevrolet Silverado

  1. Faulty Exhaust Gas Temperature Sensor 3: The sensor itself may have failed, leading to inaccurate temperature readings.
  2. Wiring Harness Damage: Damage to the wiring harness connecting the sensor to the ECM can cause electrical issues and trigger the high voltage reading.
  3. Connector Corrosion: Corrosion or poor connection at the sensor's connector can disrupt the signal and result in the P242D code.
  4. ECM Malfunction: A malfunction in the engine control module can also cause erroneous readings from the sensor, leading to the code.

Symptoms of P242D 2018 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with the P242D code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning exhaust gas temperature sensor can lead to decreased fuel efficiency as the ECM struggles to adjust fuel injection timing accurately.
  3. Rough Idling: The engine may experience rough idling or fluctuations in RPM due to incorrect sensor readings affecting fuel delivery.
  4. Hesitation During Acceleration: The vehicle may hesitate or lack power during acceleration, impacting overall performance.
  5. Engine Misfires: In severe cases, the engine may misfire due to incorrect air-fuel mixture caused by the faulty sensor.

How to Fix P242D 2018 Chevrolet Silverado

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and pinpoint the exact cause of the high voltage reading.
  2. Inspect Sensor and Wiring: Check the Exhaust Gas Temperature Sensor 3 and its wiring harness for any visible damage or corrosion.
  3. Replace Sensor: If the sensor is faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
  4. Repair Wiring: Repair or replace any damaged wiring in the sensor circuit to restore proper electrical connections.
  5. Clear Codes and Test Drive: Clear the DTC from the ECM memory, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P242D 2018 Chevrolet Silverado

The typical repair costs for addressing the P242D code on a 2018 Chevrolet Silverado can range from $200 to $500, including parts and labor. The cost of the Exhaust Gas Temperature Sensor 3 itself can vary depending on the brand and quality, typically ranging from $50 to $150. Labor rates at auto repair shops can vary between $80 and $150 per hour, so the total cost may fluctuate based on the specific diagnosis time and labor rates in your area. It's advisable to consult with a trusted mechanic or dealership to get an accurate estimate for repairing this issue on your vehicle.

What does this mean?

Tech Notes for P242D 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.

Need more information about the P242D 2018 Chevrolet Silverado code?

Need more information on how to fix the P242D 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P242D 2018 Chevrolet Silverado 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 P242D 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P242D on a 2018 Chevrolet Silverado?

The common symptoms of code P242D include the Check Engine Light (CEL) illuminating on the dashboard, reduced engine performance, and potential increased fuel consumption.

2. What does the OBDII code P242D indicate on a 2018 Chevrolet Silverado?

Code P242D indicates a high voltage condition in the Exhaust Gas Temperature Sensor 3 circuit of a 2018 Chevrolet Silverado.

3. What are the possible causes of OBDII code P242D on a 2018 Chevrolet Silverado?

Possible causes of code P242D include a faulty Exhaust Gas Temperature Sensor 3, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

4. How can I diagnose OBDII code P242D on my 2018 Chevrolet Silverado?

Diagnosing code P242D involves using an OBDII scanner to retrieve the code, inspecting the Exhaust Gas Temperature Sensor 3 and its wiring for damage, and testing the sensor's voltage output.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P242D?

It is not recommended to drive your vehicle with code P242D present, as it can lead to further engine damage or performance issues. It is advised to address the issue promptly.

6. How can I repair OBDII code P242D on my 2018 Chevrolet Silverado?

To repair code P242D, you may need to replace the Exhaust Gas Temperature Sensor 3, repair any damaged wiring or connectors, and clear the code using an OBDII scanner.

7. Are there any DIY tips for fixing OBDII code P242D on a 2018 Chevrolet Silverado?

While some basic troubleshooting like checking for loose connections can be done DIY, it is recommended to consult a professional mechanic for a proper diagnosis and repair of code P242D.

8. How much does it typically cost to fix OBDII code P242D on a 2018 Chevrolet Silverado?

The cost of fixing code P242D can vary depending on the exact cause of the issue, but it may involve parts and labor expenses ranging from $100 to $300 or more.

9. Will resetting the Check Engine Light resolve OBDII code P242D on a 2018 Chevrolet Silverado?

Simply resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing code P242D. It's crucial to diagnose and address the root cause.

10. Can extreme weather conditions affect the triggering of OBDII code P242D on a 2018 Chevrolet Silverado?

Extreme weather conditions, especially excessive heat or cold, can potentially impact the performance of sensors like the Exhaust Gas Temperature Sensor 3 and contribute to triggering code P242D.

Discuss the causes and fixes for P242D 2018 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P242D 2018 Chevrolet Silverado comments

No comments found for this page.