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P2470 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 4 Circuit Low Voltage

Quick Answer

The P2470 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Exhaust Gas Temperature Sensor 4 Circuit, specifically a low voltage condition. Common causes include Faulty Exhaust Gas Temperature Sensor 4: The sensor itself may be malfunctioning and providing incorrect voltage readings, Wiring or Connector Damage: Damage to the wiring or connectors in the sensor circuit can disrupt the signal transmission, ECM Malfunction: A malfunctioning ECM may not be properly interpreting the sensor data, leading to the low voltage condition. 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
P2470 2017 GMC Sierra indicates Exhaust Gas Temperature Sensor 4 Circuit Low Voltage.
Common causes
Common causes include Faulty Exhaust Gas Temperature Sensor 4: The sensor itself may be malfunctioning and providing incorrect voltage readings, Wiring or Connector Damage: Damage to the wiring or connectors in the sensor circuit can disrupt the signal transmission, ECM Malfunction: A malfunctioning ECM may not be properly interpreting the sensor data, leading to the low voltage condition.
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 Sep 16, 2024
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Code P2470 2017 GMC Sierra Description

The P2470 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Exhaust Gas Temperature Sensor 4 Circuit, specifically a low voltage condition. This sensor is responsible for monitoring the exhaust gas temperature in the vehicle's exhaust system. The data collected by this sensor is crucial for the engine control module (ECM) to adjust fuel injection timing and optimize combustion efficiency.

OBDII Code P2470 2017 GMC Sierra - Exhaust Gas Temperature Sensor 4 Circuit Low Voltage
P2470 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 4 Circuit Low Voltage

Common Causes of P2470 2017 GMC Sierra

  1. Faulty Exhaust Gas Temperature Sensor 4: The sensor itself may be malfunctioning and providing incorrect voltage readings.
  2. Wiring or Connector Damage: Damage to the wiring or connectors in the sensor circuit can disrupt the signal transmission.
  3. ECM Malfunction: A malfunctioning ECM may not be properly interpreting the sensor data, leading to the low voltage condition.
  4. Exhaust System Leak: A leak in the exhaust system can affect the sensor's readings and trigger this code.
  5. Extreme Temperature Conditions: Extreme heat or cold can impact the sensor's performance and accuracy.

Symptoms of P2470 2017 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. Reduced Engine Power: The vehicle may experience a decrease in engine power, making acceleration more difficult.
  3. Poor Fuel Efficiency: A faulty Exhaust Gas Temperature Sensor can lead to inefficient fuel combustion, resulting in decreased fuel efficiency.
  4. Rough Idling: The engine may idle roughly or inconsistently due to incorrect sensor readings.
  5. Emission Issues: The vehicle may fail emissions tests due to improper exhaust gas temperature readings.

How to Fix P2470 2017 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the Exhaust Gas Temperature Sensor 4 and its circuit.
  2. Replace the Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  3. Check Wiring and Connectors: Inspect the wiring and connectors in the sensor circuit for any damage or corrosion, repairing or replacing as needed.
  4. Clear the Code: After completing the repair, clear the DTC from the ECM memory using the diagnostic scanner.
  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 P2470 2017 GMC Sierra

The typical repair costs for addressing a P2470 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing the Exhaust Gas Temperature Sensor 4 and addressing any wiring or connector damage can range from $150 to $300 for parts and labor. Additional costs may apply if the ECM needs to be replaced or reprogrammed.

What does this mean?

Tech Notes for P2470 2017 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 P2470 2017 GMC Sierra Code

1. What does the OBDII code P2470 mean on a 2017 GMC Sierra?

P2470 indicates a low voltage issue in the circuit of Exhaust Gas Temperature (EGT) Sensor 4, which monitors exhaust temperatures for emissions control.

2. What are the common symptoms of code P2470 in a 2017 GMC Sierra?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, and possible activation of limp mode.

3. What causes the P2470 code to appear on a GMC Sierra?

Common causes include a faulty EGT sensor, damaged wiring or connectors, corrosion in the sensor circuit, or an issue with the engine control module (ECM).

4. Can I drive my 2017 GMC Sierra with code P2470?

While it may be possible to drive with this code, it is not recommended as it can lead to increased emissions, reduced performance, or damage to the exhaust system.

5. How do I diagnose the P2470 code on my GMC Sierra?

Start by inspecting the EGT Sensor 4 wiring and connectors for damage or corrosion. Use a multimeter to test the sensor’s voltage and resistance. If necessary, scan the ECM for additional codes.

6. How can I fix the P2470 code on a 2017 GMC Sierra?

Repairs may include replacing the faulty EGT sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or, in rare cases, reprogramming or replacing the ECM.

7. Where is Exhaust Gas Temperature Sensor 4 located on a GMC Sierra?

Sensor 4 is typically located downstream on the exhaust system, near the Diesel Particulate Filter (DPF) or catalytic converter.

8. How much does it cost to repair the P2470 code on a GMC Sierra?

Repair costs can vary but generally range from $150 to $300, depending on whether the EGT sensor or wiring needs replacement.

9. Can a dirty Diesel Particulate Filter cause the P2470 code?

While a clogged DPF itself doesn’t directly cause P2470, it can lead to higher exhaust temperatures that may damage the EGT sensor or its circuit.

10. How can I prevent the P2470 code in the future?

Regularly inspect and maintain the exhaust system, ensure the DPF is clean, and address wiring or sensor issues promptly to avoid circuit damage.

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