AutoCodes – GMC – P242D GMC

P242D GMC Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

Quick Answer

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted, Exhaust Gas Temperature 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: P242D GMC indicates Exhaust Gas Temperature Sensor 3 Circuit High Voltage.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted, Exhaust Gas Temperature 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,787

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 03, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P242D GMC Description

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Exhaust temperature sensor 1 is the first exhaust temperature sensor in the exhaust system, the following exhaust temperature sensors are counted upward from the engine outlet to the exhaust system end. The Engine Control Module (ECM) supplies 5 V to the exhaust gas temperature signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature sensor temperature information is used by the ECM during the exhaust gas particulate filter cleaning process. The Diagnostic Trouble Code (DTC) will ve set when the ECM detects that the exhaust gas temperature sensor is greater than 900 Ω for greater than 2 s.

OBDII Code P242D GMC - Exhaust Gas Temperature Sensor 3 Circuit High Voltage - AutoCodes.com — P242D GMC Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P242D GMC?

Faulty Exhaust Gas Temperature Sensor (EGTS) 3
Exhaust Gas Temperature Sensor 3 harness is open or shorted
Exhaust Gas Temperature Sensor 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P242D 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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P242D 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 P242D GMC code?

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

Need Help with the Code?

Get the P242D GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P242D 2014 GMC Sierra — Exhaust Gas Temperature Sensor 3 Circuit High Voltage
P242D 2015 GMC Sierra — Exhaust Gas Temperature Sensor 3 Circuit High Voltage
P242D 2016 GMC Sierra — Exhaust Gas Temperature Sensor 3 Circuit High Voltage
P242D 2017 GMC Sierra — Exhaust Gas Temperature Sensor 3 Circuit High Voltage
P242D 2018 GMC Sierra — Exhaust Gas Temperature Sensor 3 Circuit High Voltage

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 GMC Code

1. What are common symptoms of OBDII code P242D GMC related to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage?

The common symptoms include the illumination of the check engine light, reduced engine performance, and potential issues with fuel efficiency.

2. What are the possible causes of OBDII code P242D GMC indicating Exhaust Gas Temperature Sensor 3 Circuit High Voltage?

The code P242D GMC can be triggered by a faulty exhaust gas temperature sensor, wiring issues, a damaged sensor connector, or problems with the sensor circuit.

3. How can I diagnose the OBDII code P242D GMC related to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage?

Diagnosing this code typically involves using an OBDII scanner to retrieve the code, inspecting the exhaust gas temperature sensor and its wiring for any visible damage, and testing the sensor's voltage and resistance.

4. Can I continue driving my vehicle with OBDII code P242D GMC active?

It is not recommended to drive your vehicle with the code P242D GMC present, as it can lead to further damage to the engine or emissions system. It is best to address the issue promptly.

5. What are the repair options for OBDII code P242D GMC related to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage?

Repair options may include replacing the faulty exhaust gas temperature sensor, repairing or replacing damaged wiring, checking and cleaning the sensor connector, and clearing the trouble code with an OBDII scanner.

6. Is it possible to reset the OBDII code P242D GMC without fixing the underlying issue?

While it is possible to clear the code temporarily, it will likely reappear if the underlying issue causing the high voltage condition in the exhaust gas temperature sensor is not addressed.

7. How critical is it to fix OBDII code P242D GMC indicating Exhaust Gas Temperature Sensor 3 Circuit High Voltage?

It is important to address the code promptly to prevent potential damage to the engine or emissions system, as well as to ensure optimal performance and fuel efficiency of the vehicle.

8. Can a DIY enthusiast repair OBDII code P242D GMC on their own?

Depending on the individual's level of automotive repair knowledge and experience, some DIY enthusiasts may be able to address this code by following repair guides and using the necessary tools.

9. Are there any preventive measures to avoid triggering OBDII code P242D GMC in the future?

Regular vehicle maintenance, such as checking the exhaust system components and sensors during scheduled services, can help prevent issues that may trigger the code P242D GMC.

10. How long does it typically take to repair OBDII code P242D GMC related to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage?

The repair time can vary depending on the exact cause of the code and the complexity of the repair. It may take anywhere from a few hours to a full day to diagnose and fix the issue.