P242C 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
Quick Answer
The P242C diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically refers to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage. Common causes include Faulty Sensor: The exhaust gas temperature sensor itself may be malfunctioning, leading to the low voltage reading, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness connected to the sensor can cause voltage irregularities, Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings, causing it to detect low voltage. 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 2017 GMC Sierra indicates Exhaust Gas Temperature Sensor 3 Circuit Low Voltage.
- Common causes
- Common causes include Faulty Sensor: The exhaust gas temperature sensor itself may be malfunctioning, leading to the low voltage reading, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness connected to the sensor can cause voltage irregularities, Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings, causing it to detect low voltage.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P242C 2017 GMC Sierra Description
The P242C diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically refers to the Exhaust Gas Temperature Sensor 3 Circuit Low Voltage. This code indicates that the exhaust gas temperature sensor, which is responsible for monitoring the temperature of the exhaust gases leaving the engine, is detecting a voltage that is lower than the specified range. The exhaust gas temperature sensor plays a crucial role in ensuring the engine operates at optimal efficiency and emissions levels.
Common Causes of P242C 2017 GMC Sierra
- Faulty Sensor: The exhaust gas temperature sensor itself may be malfunctioning, leading to the low voltage reading.
- Wiring Issues: Corrosion, damage, or poor connections in the wiring harness connected to the sensor can cause voltage irregularities.
- Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings, causing it to detect low voltage.
- Faulty ECM: A malfunctioning engine control module (ECM) can also be a potential cause of the low voltage reading from the sensor.
- Environmental Factors: Extreme temperatures or exposure to contaminants can impact the sensor's performance and accuracy.
Symptoms of P242C 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with the P242C code is the illumination of the check engine light on the vehicle's dashboard.
- Decreased Fuel Efficiency: A malfunctioning exhaust gas temperature sensor can lead to incorrect fuel delivery, resulting in decreased fuel efficiency.
- Rough Idle: The engine may experience rough idling or hesitation when the exhaust gas temperature sensor is not functioning properly.
- Increased Emissions: A faulty sensor can cause the vehicle to emit higher levels of pollutants, leading to increased emissions output.
- Engine Misfires: In some cases, the engine may experience misfires or hesitation when the exhaust gas temperature sensor is not operating correctly.
How to Fix P242C 2017 GMC Sierra
- Diagnose the Issue: Begin by using a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the exhaust gas temperature sensor and related components.
- Replace the Sensor: If the sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate readings.
- Check Wiring: Inspect the wiring harness for any signs of damage, corrosion, or poor connections. Repair or replace any damaged wiring as needed.
- Repair Exhaust Leaks: Address any leaks in the exhaust system that may be affecting the sensor's readings.
- Reset the ECM: After completing the repairs, clear the trouble codes and reset the ECM to ensure the issue has been resolved.
Cost to Fix P242C 2017 GMC Sierra
The typical repair costs for addressing the P242C code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing the exhaust gas temperature sensor can cost between $150 and $300 for the part alone. Labor costs can range from $80 to $150 per hour, with the total repair bill likely falling between $250 and $500. It's important to note that additional costs may be incurred if other components need to be replaced or if further diagnostics are required. Be sure to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs.
Tech Notes for P242C 2017 GMC Sierra
Need more information about the P242C 2017 GMC Sierra code?
Need more information on how to fix the P242C 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P242C 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P242C 2017 GMC Sierra Code
1. What does the OBDII code P242C mean on a 2017 GMC Sierra?
P242C indicates a low voltage issue in the circuit for Exhaust Gas Temperature (EGT) Sensor 3, which monitors the temperature of exhaust gases to ensure proper emissions control.
2. What are the symptoms of the P242C code on a 2017 GMC Sierra?
Common symptoms include a check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.
3. What causes the P242C code to appear?
Potential causes include a faulty EGT sensor 3, damaged wiring or connectors, soot buildup on the sensor, or issues with the vehicle's PCM (Powertrain Control Module).
4. How can I diagnose the P242C code?
Start by inspecting the wiring and connectors for damage or corrosion, testing the EGT sensor with a multimeter, and checking for exhaust leaks near the sensor.
5. Can I drive with the P242C code?
Driving with this code is not recommended, as it may lead to increased emissions, reduced performance, or damage to the exhaust system.
6. How do I fix the P242C code on my 2017 GMC Sierra?
Repairs may include replacing the faulty EGT sensor 3, repairing damaged wiring, cleaning the sensor to remove soot buildup, or updating/reprogramming the PCM if necessary.
7. Where is Exhaust Gas Temperature Sensor 3 located on a 2017 GMC Sierra?
Sensor 3 is typically located in the exhaust system downstream of the DPF (Diesel Particulate Filter), but consult a repair manual for exact placement.
8. How much does it cost to fix the P242C code?
Repair costs can range from $100 to $400, depending on whether the sensor, wiring, or PCM requires replacement or repair.
9. Can a dirty or clogged DPF cause the P242C code?
Yes, a clogged DPF can cause abnormal exhaust temperatures, potentially triggering this code.
10. Will clearing the code with a scanner fix the P242C issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.
Discuss the causes and fixes for P242C 2017 GMC Sierra OBDII Code
Code P242C 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.