AutoCodes – Cadillac – P242E Cadillac

P242E Cadillac Code - Exhaust Gas Temperature Sensor 3 Circuit Intermittent

Quick Answer

The Exhaust Gas Temperature Sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Common causes include Exhaust leaks, Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted. 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: P242E Cadillac indicates Exhaust Gas Temperature Sensor 3 Circuit Intermittent.
Common causes: Common causes include Exhaust leaks, Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted.
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 319

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 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P242E Cadillac Description

The Exhaust Gas Temperature Sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. The exhaust temperature sensor 1 is the first exhaust temperature sensor on 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 be set when the ECM detects that the Exhaust Gas Temperature Sensor resistance has changed greater than a calibrated amount in less than 1 s.

OBDII Code P242E Cadillac - Exhaust Gas Temperature Sensor 3 Circuit Intermittent - AutoCodes.com — P242E Cadillac Code - Exhaust Gas Temperature Sensor 3 Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P242E Cadillac?

Exhaust leaks
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
Excessive particulate matter buildup on sensor
Faulty Engine Control Module (ECM)

How to Fix the DTC P242E Cadillac?

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 P242E Cadillac 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.

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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 P242E Cadillac Code

1. What are common symptoms of OBDII code P242E in a Cadillac related to the Exhaust Gas Temperature Sensor 3 Circuit Intermittent?

- Common symptoms may include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are possible causes of OBDII code P242E in a Cadillac?

- Possible causes may include a faulty exhaust gas temperature sensor, damaged wiring or connectors, exhaust system leaks, or issues with the engine control module.

3. How can I diagnose the Exhaust Gas Temperature Sensor 3 Circuit Intermittent issue in my Cadillac?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and its wiring for any visible damage, and testing the sensor's functionality.

4. Can I drive my Cadillac with OBDII code P242E present?

- It is generally not recommended to drive with this code present, as it can lead to further damage to the engine and emissions system. It is advised to address the issue promptly.

5. How can I repair OBDII code P242E related to the Exhaust Gas Temperature Sensor in my Cadillac?

- Repair methods may include replacing the faulty sensor, repairing or replacing damaged wiring or connectors, addressing any exhaust leaks, and clearing the fault code with an OBDII scanner.

6. Are there any DIY tips for troubleshooting OBDII code P242E in a Cadillac?

- DIY tips may include visually inspecting the sensor and wiring for damage, checking for exhaust leaks, and ensuring all connections are secure before seeking professional help if needed.

7. Can a faulty Exhaust Gas Temperature Sensor cause other issues in my Cadillac?

- Yes, a faulty sensor can lead to poor engine performance, reduced fuel efficiency, and potential damage to other components in the exhaust and emissions system.

8. How much does it typically cost to repair OBDII code P242E in a Cadillac at a repair shop?

- Repair costs can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Will resetting the check engine light resolve OBDII code P242E in a Cadillac?

- Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the fault code to appear.

10. How can I prevent OBDII code P242E from occurring in my Cadillac in the future?

- Regular maintenance and inspections of the exhaust system, including the exhaust gas temperature sensor, can help prevent this code from reoccurring.