AutoCodes – Chevrolet – P242C Chevrolet

P242C Chevrolet Code - Exhaust Gas Temperature Sensor 3 Circuit Low 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: P242C Chevrolet indicates Exhaust Gas Temperature Sensor 3 Circuit Low 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.

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Code Popularity 2,766

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
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Code P242C Chevrolet 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 less than 158 Ω for greater than 2 s.

OBDII Code P242C Chevrolet - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P242C Chevrolet Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P242C Chevrolet?

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 P242C Chevrolet?

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 P242C Chevrolet 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 P242C Chevrolet code?

Need more information on how to fix the P242C Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Chevrolet Models

P242C 2014 Chevrolet Silverado — Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2015 Chevrolet Silverado — Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2016 Chevrolet Silverado — Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2017 Chevrolet Silverado — Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C 2018 Chevrolet Silverado — Exhaust Gas Temperature Sensor 3 Circuit Low 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 P242C Chevrolet Code

1. What are the common symptoms of OBDII code P242C on a Chevrolet related to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage?

The common symptoms include poor engine performance, decreased fuel efficiency, and potentially a check engine light illuminated on the dashboard.

2. What are the possible causes of OBDII code P242C on a Chevrolet indicating a low voltage issue with Exhaust Gas Temperature Sensor 3?

Possible causes include a faulty exhaust gas temperature sensor, wiring or connector issues, a malfunctioning powertrain control module (PCM), or even a damaged sensor.

3. How can I diagnose the OBDII code P242C on a Chevrolet associated with the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage?

Diagnosis involves using an OBDII scanner to read the code, inspecting the wiring and connectors for any damage, testing the sensor itself, and checking for any related issues in the exhaust system.

4. Can a DIY enthusiast repair OBDII code P242C on a Chevrolet caused by a low voltage problem with Exhaust Gas Temperature Sensor 3?

While it's possible to replace the exhaust gas temperature sensor as a DIY repair, it's recommended to consult a professional if you're unsure about diagnosing or fixing wiring or PCM-related issues.

5. Are there any quick tips for fixing OBDII code P242C on a Chevrolet linked to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage?

Quick tips include ensuring proper wiring connections, checking for any visible damage to the sensor, and following the manufacturer's recommended diagnostic and repair procedures.

6. What role does the Exhaust Gas Temperature Sensor 3 play in the vehicle's exhaust system on a Chevrolet?

The Exhaust Gas Temperature Sensor 3 monitors the temperature of the exhaust gas to help the PCM regulate fuel mixture and emissions, ensuring optimal engine performance and efficiency.

7. How serious is OBDII code P242C on a Chevrolet caused by a low voltage issue with Exhaust Gas Temperature Sensor 3?

While the vehicle may still be operable with this code, it's important to address it promptly to avoid potential issues with engine performance, emissions, and fuel economy in the long run.

8. Can driving with OBDII code P242C on a Chevrolet related to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage cause further damage?

Continued driving with this code may lead to decreased engine efficiency, potential damage to the catalytic converter, and increased emissions, so it's best to address the issue as soon as possible.

9. How much does it typically cost to repair OBDII code P242C on a Chevrolet due to a low voltage problem with Exhaust Gas Temperature Sensor 3?

The cost of repair can vary depending on the exact cause of the issue, but it may range from around $100 to $300 for parts and labor, with sensor replacement being a common solution.

10. Is it necessary to reset the OBDII system after repairing OBDII code P242C on a Chevrolet associated with the Exhaust Gas Temperature Sensor 3?

Yes, it's recommended to clear the code and reset the OBDII system after repairing the issue to ensure that the vehicle's PCM recognizes the fix and operates properly.