AutoCodes – GMC – P242B GMC

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

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 3, Exhaust Gas Temperature Sensor Bank 1 Sensor 3 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 1 Sensor 3 circuit poor electrical connection. 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 Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 3, Exhaust Gas Temperature Sensor Bank 1 Sensor 3 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 1 Sensor 3 circuit poor electrical connection.
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.

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Code Popularity 1,985

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P242B GMC Description

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it into a voltage and feeds back to the PCM with the voltage signal in order to control engine conditions to effectively reduce emissions. The PCM sets the P242B OBDII code when the Exhaust Gas Temperature Sensor is out of factory specifications.

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

What does this mean?

What are the Possible Causes of the DTC P242B GMC?

Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 3
Exhaust Gas Temperature Sensor Bank 1 Sensor 3 harness is open or shorted
Exhaust Gas Temperature Sensor Bank 1 Sensor 3 circuit poor electrical connection
Exhaust leaks
Excessive particulate matter buildup on sensor

How to Fix the DTC P242B GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P242B GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P242B GMC code?

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Need Help with the Code?

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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.