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P2471 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 4 Circuit High Voltage

Quick Answer

The P2471 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Exhaust Gas Temperature Sensor 4 Circuit High Voltage. Common causes include Faulty Sensor: The most common cause of this DTC is a faulty exhaust gas temperature sensor, Wiring Issues: Damage or corrosion to the wiring connected to the sensor can also trigger this code, Exhaust System Leaks: Leaks in the exhaust system can lead to incorrect temperature readings by the sensor. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P2471 2018 GMC Sierra indicates Exhaust Gas Temperature Sensor 4 Circuit High Voltage.
Common causes
Common causes include Faulty Sensor: The most common cause of this DTC is a faulty exhaust gas temperature sensor, Wiring Issues: Damage or corrosion to the wiring connected to the sensor can also trigger this code, Exhaust System Leaks: Leaks in the exhaust system can lead to incorrect temperature readings by the sensor.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P2471 2018 GMC Sierra Description

The P2471 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Exhaust Gas Temperature Sensor 4 Circuit High Voltage. This code indicates that there is a higher than normal voltage reading coming from the exhaust gas temperature sensor 4. The exhaust gas temperature sensor is responsible for monitoring the temperature of the exhaust gases to ensure optimal performance and emissions control. When the voltage reading is too high, it can lead to issues with engine performance, fuel efficiency, and emissions output.

OBDII Code P2471 2018 GMC Sierra - Exhaust Gas Temperature Sensor 4 Circuit High Voltage
P2471 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 4 Circuit High Voltage

Common Causes of P2471 2018 GMC Sierra

  1. Faulty Sensor: The most common cause of this DTC is a faulty exhaust gas temperature sensor.
  2. Wiring Issues: Damage or corrosion to the wiring connected to the sensor can also trigger this code.
  3. Exhaust System Leaks: Leaks in the exhaust system can lead to incorrect temperature readings by the sensor.
  4. Engine Tuning: Incorrect engine tuning or modifications can cause the sensor to provide inaccurate readings.
  5. ECM Malfunction: A malfunctioning engine control module (ECM) can also contribute to this issue.

Symptoms of P2471 2018 GMC Sierra

  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. Decreased Performance: The vehicle may experience a decrease in performance, including reduced power and acceleration.
  3. Poor Fuel Efficiency: A faulty exhaust gas temperature sensor can cause the engine to run less efficiently, leading to decreased fuel economy.
  4. Rough Idling: The engine may idle roughly or inconsistently due to the incorrect temperature readings from the sensor.

How to Fix P2471 2018 GMC Sierra

  1. Diagnostic Testing: Begin by using a diagnostic tool to read and clear the trouble codes, and monitor the live data from the exhaust gas temperature sensor.
  2. Sensor Replacement: If the sensor is found to be faulty, it will need to be replaced with a new one.
  3. Wiring Inspection: Check the wiring connected to the sensor for any damage or corrosion, and repair or replace as needed.
  4. Exhaust System Inspection: Inspect the exhaust system for leaks and repair any found to ensure accurate sensor readings.
  5. ECM Check: If all else fails, have the engine control module checked for any malfunctions that may be affecting the sensor readings.

Cost to Fix P2471 2018 GMC Sierra

The cost of repairing a P2471 code for an exhaust gas temperature sensor 4 circuit high voltage can vary depending on the specific vehicle, location, and labor rates. However, on average, the cost of parts for a new sensor can range from $50 to $150, with labor costs typically adding another $100 to $200. Overall, the total repair cost for this issue can range from $150 to $350. It is recommended to check with local auto repair shops for more accurate estimates based on your specific circumstances.

What does this mean?

Tech Notes for P2471 2018 GMC Sierra

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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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 P2471 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2471 in a 2018 GMC Sierra?

When the Exhaust Gas Temperature Sensor 4 Circuit registers high voltage, common symptoms include reduced engine performance, decreased fuel efficiency, and possibly the illumination of the check engine light.

2. What are the potential causes of OBDII code P2471 in a 2018 GMC Sierra?

The high voltage in the Exhaust Gas Temperature Sensor 4 Circuit can be triggered by issues such as a faulty sensor, damaged wiring, a poor electrical connection, or problems with the engine control module.

3. How can I diagnose the cause of OBDII code P2471 in my 2018 GMC Sierra?

To diagnose the issue, you can start by visually inspecting the sensor and its wiring for any visible damage. Using a multimeter, you can test the sensor's resistance and voltage output to determine if it is functioning correctly.

4. Is it safe to continue driving my 2018 GMC Sierra with OBDII code P2471 active?

While the vehicle may still be operational with this code, it is recommended to address the issue promptly to prevent potential damage to the engine or emissions system. Continued driving with a faulty sensor can lead to more severe problems over time.

5. Can I reset OBDII code P2471 in my 2018 GMC Sierra without fixing the underlying issue?

Resetting the code without fixing the root cause will only temporarily turn off the check engine light. The code will likely reappear once the issue persists, so it's best to address the problem to ensure proper vehicle functionality.

6. How much does it typically cost to repair OBDII code P2471 in a 2018 GMC Sierra?

The cost of repairing OBDII code P2471 can vary depending on the exact cause of the issue. Expenses may include the price of a new sensor, labor costs for installation, and any additional components that need to be replaced or repaired.

7. Can I replace the Exhaust Gas Temperature Sensor 4 in my 2018 GMC Sierra myself?

Replacing the sensor yourself is possible if you have the necessary tools and automotive knowledge. However, if you're unsure about the process or lack experience, it's recommended to seek professional assistance to ensure the job is done correctly.

8. How long does it typically take to repair OBDII code P2471 in a 2018 GMC Sierra?

The repair time for OBDII code P2471 can vary based on the exact issue and the expertise of the technician. In general, the repair process can take anywhere from 1 to 3 hours, depending on the complexity of the repair.

9. Will fixing OBDII code P2471 improve the overall performance of my 2018 GMC Sierra?

Addressing the high voltage issue in the Exhaust Gas Temperature Sensor 4 Circuit can help restore optimal engine performance, improve fuel efficiency, and prevent potential damage to other components in the vehicle.

10. Are there any preventive measures I can take to avoid OBDII code P2471 in my 2018 GMC Sierra in the future?

Regular maintenance, such as inspecting and cleaning the sensors, checking the wiring for damage, and addressing any engine issues promptly, can help prevent the recurrence of OBDII code P2471 in your 2018 GMC Sierra.

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