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Engine-Codes – GMC – P2481 2018 GMC Sierra

P2481 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Circuit Low Voltage

Quick Answer

The P2481 diagnostic trouble code for a 2018 GMC Sierra refers to an issue with the Exhaust Gas Temperature Sensor 5 Circuit, specifically indicating a low voltage condition. Common causes include Faulty Sensor: The exhaust gas temperature sensor itself may be malfunctioning, leading to inaccurate voltage readings, Wiring Issues: Damaged or corroded wiring connections can cause a loss of voltage signal between the sensor and the ECM, ECM Malfunction: A problem with the engine control module can also result in low voltage output from 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
P2481 2018 GMC Sierra indicates Exhaust Gas Temperature Sensor 5 Circuit Low Voltage.
Common causes
Common causes include Faulty Sensor: The exhaust gas temperature sensor itself may be malfunctioning, leading to inaccurate voltage readings, Wiring Issues: Damaged or corroded wiring connections can cause a loss of voltage signal between the sensor and the ECM, ECM Malfunction: A problem with the engine control module can also result in low voltage output from 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 18, 2024
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Code P2481 2018 GMC Sierra Description

The P2481 diagnostic trouble code for a 2018 GMC Sierra refers to an issue with the Exhaust Gas Temperature Sensor 5 Circuit, specifically indicating a low voltage condition. This sensor is responsible for monitoring the exhaust gas temperature and providing this data to the engine control module (ECM) for optimal fuel delivery and emissions control. When the voltage output from the sensor is lower than expected, it can lead to a variety of performance issues and potentially affect the vehicle's overall operation.

OBDII Code P2481 2018 GMC Sierra - Exhaust Gas Temperature Sensor 5 Circuit Low Voltage
P2481 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 5 Circuit Low Voltage

Common Causes of P2481 2018 GMC Sierra

  1. Faulty Sensor: The exhaust gas temperature sensor itself may be malfunctioning, leading to inaccurate voltage readings.
  2. Wiring Issues: Damaged or corroded wiring connections can cause a loss of voltage signal between the sensor and the ECM.
  3. ECM Malfunction: A problem with the engine control module can also result in low voltage output from the sensor.
  4. Exhaust System Leaks: Leaks in the exhaust system can impact the sensor's ability to accurately measure temperature.
  5. Environmental Factors: Extreme temperatures or exposure to contaminants can affect the sensor's performance.

Symptoms of P2481 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 dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in engine power and overall performance.
  3. Poor Fuel Efficiency: A faulty exhaust gas temperature sensor can lead to inefficient fuel consumption.
  4. Rough Idle: The engine may idle roughly or inconsistently due to incorrect temperature readings.
  5. Increased Emissions: The vehicle may produce higher emissions due to improper exhaust gas temperature monitoring.

How to Fix P2481 2018 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to confirm the P2481 code and pinpoint the exact cause of the low voltage condition.
  2. Inspect Wiring: Check the wiring harness and connectors for any damage or corrosion, repairing or replacing as needed.
  3. Test Sensor: Test the exhaust gas temperature sensor to determine if it is functioning properly or needs to be replaced.
  4. Address Exhaust Leaks: Inspect the exhaust system for leaks and repair any issues to ensure accurate sensor readings.
  5. Reset the Code: Clear the diagnostic trouble code from the ECM memory after completing the repairs to see if the issue has been resolved.

Cost to Fix P2481 2018 GMC Sierra

The cost of repairing a P2481 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing the exhaust gas temperature sensor or addressing wiring problems can range from $150 to $300, including parts and labor. However, additional costs may apply if other components need to be replaced or if more extensive repairs are required. It's recommended to consult with a professional mechanic for an accurate estimate based on the individual circumstances of the vehicle.

What does this mean?

Tech Notes for P2481 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 P2481 2018 GMC Sierra Code

1. What does the OBDII code P2481 mean on a 2018 GMC Sierra?

The P2481 code indicates a problem with the Exhaust Gas Temperature Sensor 5 Circuit, specifically that it is reading low voltage.

2. What are the symptoms of the P2481 code on a GMC Sierra?

Common symptoms include a check engine light, poor engine performance, reduced fuel efficiency, and possible issues with the diesel particulate filter (DPF) regeneration process.

3. What causes the P2481 code to appear?

The most common causes are a faulty exhaust gas temperature (EGT) sensor, damaged wiring or connectors in the EGT sensor circuit, or a malfunctioning PCM (Powertrain Control Module).

4. Can I drive my 2018 GMC Sierra with the P2481 code?

While it may be possible to drive, ignoring the issue can lead to further damage, especially to the DPF system, and may cause reduced performance over time.

5. How do I diagnose the P2481 code?

Diagnosis involves checking the EGT Sensor 5 for proper operation, inspecting the wiring and connectors for damage or corrosion, and using a multimeter to test voltage and resistance in the circuit.

6. How is the P2481 code fixed?

Repairs typically include replacing the faulty EGT Sensor 5, repairing or replacing damaged wiring or connectors, or reprogramming/updating the PCM if necessary.

7. How much does it cost to fix the P2481 code on a GMC Sierra?

The cost of repair depends on the issue, with EGT sensor replacement costing around $100-$300, plus labor. Wiring repairs or PCM reprogramming may vary.

8. What happens if I don’t fix the P2481 code?

If left unresolved, the P2481 code can prevent proper DPF regeneration, leading to clogged filters, decreased engine performance, and potential long-term engine damage.

9. Can a bad EGT sensor cause the P2481 code?

Yes, a bad or failing EGT Sensor 5 is one of the most common causes of the P2481 code.

10. Does clearing the P2481 code with a scan tool fix the problem?

Clearing the code may resolve the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.

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