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P242D 2015 Chevrolet Silverado Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

Quick Answer

The P242D diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado refers to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage. Common causes include Faulty exhaust gas temperature sensor 3, Damaged wiring or connectors leading to the sensor, ECM software issues. 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 2015 Chevrolet Silverado indicates Exhaust Gas Temperature Sensor 3 Circuit High Voltage.
Common causes
Common causes include Faulty exhaust gas temperature sensor 3, Damaged wiring or connectors leading to the sensor, ECM software issues.
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 16, 2024
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Code P242D 2015 Chevrolet Silverado Description

The P242D diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado refers to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage. This code indicates that the exhaust gas temperature sensor 3 is detecting a voltage that is higher than the expected range. The exhaust gas temperature sensor is a crucial component in monitoring the temperature of the exhaust gases leaving the engine. This information is essential for the engine control module (ECM) to adjust fuel delivery and optimize engine performance.

OBDII Code P242D 2015 Chevrolet Silverado - Exhaust Gas Temperature Sensor 3 Circuit High Voltage
P242D 2015 Chevrolet Silverado Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

Common Causes of P242D 2015 Chevrolet Silverado

  1. Faulty exhaust gas temperature sensor 3
  2. Damaged wiring or connectors leading to the sensor
  3. ECM software issues
  4. Exhaust system leaks
  5. Engine overheating

Symptoms of P242D 2015 Chevrolet Silverado

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

How to Fix P242D 2015 Chevrolet Silverado

  1. Use an OBD-II scanner to retrieve the specific DTC and confirm the diagnosis.
  2. Inspect the exhaust gas temperature sensor 3 and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance and voltage output to determine if it is functioning correctly.
  4. Replace the exhaust gas temperature sensor 3 if it is found to be faulty.
  5. Clear the DTC and reset the ECM to ensure the repair was successful.

Cost to Fix P242D 2015 Chevrolet Silverado

The typical repair costs for addressing the P242D code on a 2015 Chevrolet Silverado can range from $150 to $300, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It is recommended to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P242D 2015 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 P242D 2015 Chevrolet Silverado Code

1. What does the OBDII code P242D mean for a 2015 Chevrolet Silverado?

P242D indicates a high voltage issue in the Exhaust Gas Temperature (EGT) Sensor 3 circuit, which monitors the exhaust system's temperature to help regulate emissions and protect components.

2. What are the common symptoms of code P242D in a 2015 Silverado?

Typical symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, and possibly the engine entering limp mode.

3. What causes the P242D code in a 2015 Chevrolet Silverado?

Common causes include a faulty EGT sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning powertrain control module (PCM).

4. Can I drive my Silverado with the P242D code?

While it may be possible to drive short distances, prolonged driving with this code can lead to increased emissions, reduced performance, and potential damage to the exhaust system or catalytic converter.

5. How do I fix the P242D code on my 2015 Chevrolet Silverado?

Repairs typically involve inspecting and replacing the EGT sensor if faulty, repairing or replacing damaged wiring or connectors, or, in rare cases, reprogramming or replacing the PCM.

6. How do I test the Exhaust Gas Temperature Sensor for code P242D?

You can test the sensor using a multimeter to check for proper voltage readings or continuity. Compare the results to manufacturer specifications to determine if the sensor is functioning correctly.

7. Where is Exhaust Gas Temperature Sensor 3 located on a 2015 Silverado?

Sensor 3 is typically located in the exhaust system downstream of the catalytic converter, but refer to the vehicle’s service manual for the exact location.

8. Can a dirty or clogged exhaust system trigger code P242D?

While unlikely, excessive soot or carbon deposits in the exhaust system could affect the EGT sensor's readings, potentially contributing to the issue.

9. What tools are needed to diagnose and repair code P242D?

You’ll need an OBDII scanner, a multimeter, and basic hand tools to diagnose and repair the issue. A service manual is also helpful for locating components and specifications.

10. How much does it cost to fix the P242D code on a 2015 Silverado?

The cost can vary depending on the issue. Replacing the EGT sensor typically costs $100–$300, including parts and labor. Wiring repairs or PCM replacements may cost more.

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