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Engine-Codes – Generic – P242C

P242C Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Quick Answer

The P242C diagnostic trouble code indicates that there is a low voltage condition detected in the Exhaust Gas Temperature (EGT) Sensor 3 circuit. Common causes include Faulty EGT Sensor: The sensor itself may be malfunctioning or damaged, leading to the low voltage condition, Wiring Issues: Corroded, damaged, or disconnected wiring in the sensor circuit can cause a low voltage reading, Sensor Connector Problems: Poor connections or loose pins in the sensor connector can also 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
P242C indicates Exhaust Gas Temperature Sensor 3 Circuit Low Voltage.
Common causes
Common causes include Faulty EGT Sensor: The sensor itself may be malfunctioning or damaged, leading to the low voltage condition, Wiring Issues: Corroded, damaged, or disconnected wiring in the sensor circuit can cause a low voltage reading, Sensor Connector Problems: Poor connections or loose pins in the sensor connector can also 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 25, 2024
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Code P242C Description

The P242C diagnostic trouble code indicates that there is a low voltage condition detected in the Exhaust Gas Temperature (EGT) Sensor 3 circuit. This sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. A low voltage reading suggests that the sensor is not operating within the expected parameters, which can lead to incorrect fuel mixture adjustments and affect the overall performance of the vehicle. If left unaddressed, this issue can potentially lead to reduced fuel efficiency, increased emissions, and engine misfires.

OBDII Code P242C - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
P242C Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage

Common Causes of P242C

  1. Faulty EGT Sensor: The sensor itself may be malfunctioning or damaged, leading to the low voltage condition.
  2. Wiring Issues: Corroded, damaged, or disconnected wiring in the sensor circuit can cause a low voltage reading.
  3. Sensor Connector Problems: Poor connections or loose pins in the sensor connector can also trigger this code.
  4. ECM/PCM Malfunction: A malfunction in the Engine Control Module (ECM) or Powertrain Control Module (PCM) can also cause the low voltage condition in the EGT Sensor 3 circuit.

Symptoms of P242C

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Reduced Engine Performance: The engine may experience a decrease in power and acceleration due to incorrect fuel mixture adjustments.
  3. Poor Fuel Efficiency: The vehicle may consume more fuel than usual as a result of the faulty EGT Sensor 3 circuit.
  4. Rough Idling: The engine may idle roughly or inconsistently due to the incorrect temperature readings from the sensor.

How to Fix P242C

  1. Diagnose the Issue: Use a diagnostic scanner to verify the P242C code and inspect the EGT Sensor 3 circuit for any visible damage.
  2. Replace EGT Sensor: If the sensor is found to be faulty, replace it with a new one according to the manufacturer's specifications.
  3. Check Wiring and Connections: Inspect the wiring harness and sensor connector for any signs of damage or corrosion, repairing or replacing as necessary.
  4. Clear Fault Codes: Clear the fault codes from the ECM/PCM memory using the diagnostic scanner after completing the repair.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the Check Engine Light does not reappear.

Cost to Fix P242C

The cost of repairing a low voltage condition in the Exhaust Gas Temperature Sensor 3 circuit can vary depending on the make and model of the vehicle, the location of the repair shop, and the cost of parts. On average, the repair for this issue can range from $150 to $400, including parts and labor. It's recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P242C

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.

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Code P242C Information for Specific Makes

  • P242C Chevrolet — Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
  • P242C Dodge — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3
  • P242C Ford — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3
  • P242C GMC — Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
  • P242C Lincoln — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3
  • P242C Mercury — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3
  • P242C RAM — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3
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 Code

1. What are the common symptoms of OBDII code P242C (Exhaust Gas Temperature Sensor 3 Circuit Low Voltage)?

The common symptoms of code P242C may include reduced engine performance, poor fuel efficiency, and an illuminated check engine light.

2. What typically causes OBDII code P242C to trigger?

Code P242C is usually triggered by a faulty exhaust gas temperature (EGT) sensor, damaged wiring or connectors in the EGT sensor circuit, or issues with the EGT sensor module.

3. How can I diagnose the cause of OBDII code P242C?

Diagnosing code P242C involves using a scan tool to retrieve the code, inspecting the EGT sensor and its wiring for damage, and testing the sensor's resistance to determine if it is functioning properly.

4. Can a DIYer repair OBDII code P242C at home?

While some DIYers may be able to replace the EGT sensor themselves, diagnosing and repairing code P242C may require specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Is it safe to drive with OBDII code P242C present?

Continuing to drive with code P242C may result in potential damage to the catalytic converter or other engine components. It is advisable to address the issue promptly to prevent further damage.

6. How much does it typically cost to repair OBDII code P242C?

The cost of repairing code P242C can vary depending on the cause of the issue, the labor rates in your area, and the parts needed for the repair. It is recommended to obtain quotes from local mechanics for an accurate estimate.

7. Are there any preventive measures to avoid OBDII code P242C?

Regular maintenance of the exhaust system, including checking the EGT sensor and its wiring for signs of wear or damage, can help prevent code P242C from occurring.

8. Can a faulty EGT sensor cause other issues besides triggering code P242C?

Yes, a faulty EGT sensor can potentially affect engine performance, fuel efficiency, and emissions control. It is crucial to address EGT sensor issues promptly to avoid further complications.

9. How long does it typically take to repair OBDII code P242C?

The repair time for code P242C can vary depending on the exact cause of the issue and the availability of parts. In general, a skilled mechanic can diagnose and repair the issue within a few hours to a day.

10. Will resetting the Check Engine Light make OBDII code P242C disappear permanently?

Resetting the Check Engine Light without addressing the underlying issue causing code P242C will not make the problem disappear permanently. It is crucial to diagnose and repair the root cause of the code for a lasting solution.

Discuss the causes and fixes for P242C OBDII Code

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  • Stopped Mazda bt-50 3.2 2017 4x4 and on idle heaps of white smoke with an unfamiliar odor was present, after smoke cleared with increasing the rpm's it went into limp mode with engine warning light illuminated. Faults show as P242C-00 and P242C:00-AF.

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