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P2066 2014 GMC Sierra Code - Fuel Level Sensor 2 Performance

Quick Answer

The P2066 diagnostic trouble code for a 2014 GMC Sierra indicates a problem with the Fuel Level Sensor 2 Performance. Common causes include Faulty Fuel Level Sensor 2, Wiring issues or corrosion in the sensor circuit, ECM communication problems. 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
P2066 2014 GMC Sierra indicates Fuel Level Sensor 2 Performance.
Common causes
Common causes include Faulty Fuel Level Sensor 2, Wiring issues or corrosion in the sensor circuit, ECM communication problems.
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 Sep 14, 2024
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Code P2066 2014 GMC Sierra Description

The P2066 diagnostic trouble code for a 2014 GMC Sierra indicates a problem with the Fuel Level Sensor 2 Performance. This sensor is responsible for measuring the fuel level in the vehicle's fuel tank and sending this information to the engine control module (ECM). The ECM uses this data to calculate fuel consumption, optimize engine performance, and provide accurate readings on the fuel gauge.

OBDII Code P2066 2014 GMC Sierra - Fuel Level Sensor 2 Performance
P2066 2014 GMC Sierra Code - Fuel Level Sensor 2 Performance

Common Causes of P2066 2014 GMC Sierra

  1. Faulty Fuel Level Sensor 2
  2. Wiring issues or corrosion in the sensor circuit
  3. ECM communication problems
  4. Fuel contamination affecting sensor performance
  5. Electrical issues in the fuel system

Symptoms of P2066 2014 GMC Sierra

  1. Inaccurate fuel level readings on the dashboard
  2. Fluctuating fuel gauge readings
  3. Check Engine Light illuminated
  4. Engine stalling or hesitation
  5. Poor fuel efficiency

How to Fix P2066 2014 GMC Sierra

  1. Diagnose the issue using a scan tool to confirm the P2066 code and identify the specific cause of the problem.
  2. Inspect the wiring and connections related to the Fuel Level Sensor 2 for any damage or corrosion. Repair or replace as necessary.
  3. Test the Fuel Level Sensor 2 for proper functionality and resistance values. Replace the sensor if it fails the test.
  4. Clear the trouble code from the ECM memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to check for any underlying issues with the ECM or fuel system components.

Cost to Fix P2066 2014 GMC Sierra

The typical repair costs for addressing a P2066 code related to Fuel Level Sensor 2 Performance can range from $200 to $500, including parts and labor. However, prices can vary depending on the location, vehicle make and model, and the specific repair shop. It's advisable to consult with a trusted mechanic or dealership to get an accurate estimate based on your circumstances. Keep in mind that diagnosis time and labor rates can also impact the final cost of the repair.

What does this mean?

Tech Notes for P2066 2014 GMC Sierra

A low fuel level can trigger this code. Before replacing any parts, try filling up the fuel tank and erasing the engine code. If the problem persists, it may be necessary to replace the fuel level sensor.

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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 P2066 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P2066 (Fuel Level Sensor 2 Performance) in a 2014 GMC Sierra?

- Common symptoms include inaccurate fuel level readings on the dashboard, fluctuating fuel gauge readings, and the fuel gauge getting stuck at a certain level.

2. What are the possible causes of OBDII code P2066 in a 2014 GMC Sierra?

- The code P2066 can be triggered by a faulty fuel level sensor, a damaged wiring harness, poor electrical connections, or a problem with the fuel tank sending unit.

3. How can I diagnose the cause of OBDII code P2066 in my 2014 GMC Sierra?

- Diagnosing the issue may involve checking the fuel level sensor's wiring and connections, testing the sensor's resistance, inspecting the fuel tank sending unit, and using a diagnostic scanner to monitor sensor data.

4. Can I still drive my 2014 GMC Sierra with OBDII code P2066 (Fuel Level Sensor 2 Performance)?

- While it may be possible to drive the vehicle with this code, it is not recommended as inaccurate fuel level readings can lead to running out of fuel unexpectedly. It's best to address the issue promptly.

5. How can I repair OBDII code P2066 in my 2014 GMC Sierra?

- Repair options may include replacing the faulty fuel level sensor, repairing or replacing the wiring harness, ensuring proper electrical connections, or replacing the fuel tank sending unit if necessary.

6. Is it possible to reset OBDII code P2066 in a 2014 GMC Sierra without fixing the underlying issue?

- While clearing the fault code may temporarily turn off the Check Engine Light, the underlying problem causing the code will persist. It is essential to diagnose and repair the issue to prevent it from recurring.

7. Are there any DIY repair tips for addressing OBDII code P2066 in a 2014 GMC Sierra?

- DIY enthusiasts with automotive repair experience may attempt to replace the fuel level sensor themselves after confirming the diagnosis and ensuring they have the necessary tools and knowledge.

8. How much does it typically cost to repair OBDII code P2066 in a 2014 GMC Sierra at a professional auto repair shop?

- The cost of repairing OBDII code P2066 can vary depending on the specific cause of the issue, but it may range from $200 to $500, including parts and labor.

9. Will OBDII code P2066 (Fuel Level Sensor 2 Performance) affect my 2014 GMC Sierra's fuel efficiency?

- While the code itself may not directly impact fuel efficiency, driving with inaccurate fuel level readings can potentially lead to running out of fuel or other issues that may affect overall fuel efficiency.

10. How soon should I address OBDII code P2066 in my 2014 GMC Sierra after it appears?

- It is recommended to address OBDII code P2066 as soon as possible to avoid potential fuel-related issues and to ensure the accurate monitoring of fuel levels in your vehicle.

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