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Engine-Codes – GMC – P242B GMC

P242B GMC Code - Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 3

Quick Answer

The P242B GMC code indicates a problem with the Exhaust Gas Temperature (EGT) sensor circuit in Bank 1 Sensor 3. Common causes include Faulty EGT Sensor: The sensor itself may be faulty and not providing accurate readings, Wiring Issues: Problems with the wiring connecting the EGT sensor to the engine control module can cause communication errors, Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings and trigger this 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
P242B GMC indicates Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 3.
Common causes
Common causes include Faulty EGT Sensor: The sensor itself may be faulty and not providing accurate readings, Wiring Issues: Problems with the wiring connecting the EGT sensor to the engine control module can cause communication errors, Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings and trigger this 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 Aug 30, 2024
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Code P242B GMC Description

The P242B GMC code indicates a problem with the Exhaust Gas Temperature (EGT) sensor circuit in Bank 1 Sensor 3. This sensor is responsible for measuring the temperature of the exhaust gases leaving the engine. The EGT sensor plays a crucial role in the engine's performance, fuel efficiency, and emissions control. When this sensor malfunctions or fails to provide accurate readings, it can lead to various issues with the vehicle's performance and emissions.

OBDII Code P242B GMC - Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 3
P242B GMC Code - Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 3

Common Causes of P242B GMC

  1. Faulty EGT Sensor: The sensor itself may be faulty and not providing accurate readings.
  2. Wiring Issues: Problems with the wiring connecting the EGT sensor to the engine control module can cause communication errors.
  3. Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings and trigger this code.
  4. Exhaust Gas Recirculation (EGR) System Malfunction: Issues with the EGR system can impact the EGT sensor's performance.

Symptoms of P242B GMC

  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 Engine Performance: The vehicle may experience a decrease in power, acceleration, and overall performance.
  3. Poor Fuel Efficiency: A faulty EGT sensor can cause the engine to run inefficiently, leading to decreased fuel economy.
  4. Increased Emissions: A malfunctioning EGT sensor can result in higher emissions output from the vehicle.
  5. Rough Idle: The engine may idle roughly or have irregular idling patterns.

How to Fix P242B GMC

  1. Diagnose the Issue: Use a diagnostic tool to pinpoint the exact cause of the problem and verify that the EGT sensor in Bank 1 Sensor 3 is the issue.
  2. Replace the EGT Sensor: If the sensor is faulty, it will need to be replaced with a new one.
  3. Check Wiring: Inspect the wiring connecting the sensor to the engine control module for any damage or loose connections.
  4. Repair Exhaust Leaks: If there are leaks in the exhaust system, they will need to be repaired to ensure accurate sensor readings.
  5. Test and Clear Codes: After the repair is complete, test the vehicle to ensure the issue is resolved and clear the diagnostic trouble codes.

Cost to Fix P242B GMC

The cost of repairing the P242B GMC code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing an EGT sensor and addressing related issues can range from $200 to $500, including parts and labor. Keep in mind that additional costs may apply if other components need to be repaired or replaced. It's recommended to consult with a trusted mechanic or dealership to get an accurate estimate for your vehicle.

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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 P242B GMC Code

1. What are common symptoms of OBDII code P242B GMC?

- Common symptoms include reduced engine performance, increased fuel consumption, and the illumination of the check engine light.

2. What does OBDII code P242B GMC indicate?

- This code indicates an issue with the Exhaust Gas Temperature Sensor Circuit Range/Performance for Bank 1 Sensor 3.

3. What are possible causes of OBDII code P242B GMC?

- Possible causes include a faulty exhaust gas temperature sensor, wiring issues, a damaged sensor connector, or a problem with the sensor circuit.

4. How can I diagnose the cause of OBDII code P242B GMC?

- Diagnosis involves visually inspecting the sensor and its wiring, testing the sensor's resistance, checking for voltage at the sensor connector, and using a scan tool to monitor sensor data.

5. Can I continue driving with OBDII code P242B GMC?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the vehicle and may cause increased emissions.

6. How do I repair OBDII code P242B GMC?

- Repair typically involves replacing the faulty exhaust gas temperature sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

7. Will OBDII code P242B GMC cause my vehicle to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test due to increased emissions and potential performance issues.

8. How much does it cost to repair OBDII code P242B GMC?

- The cost of repair can vary depending on the extent of the issue, but it may range from $100 to $300 for parts and labor.

9. How long does it take to repair OBDII code P242B GMC?

- Repair time can vary based on the specific issue and the technician's experience, but it typically takes around 1-2 hours to diagnose and replace the faulty sensor.

10. Can I reset OBDII code P242B GMC without repairing the issue?

- While you can clear the code temporarily with a scan tool, it is not recommended to reset the code without addressing the underlying problem, as it may lead to ongoing issues with your vehicle.

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