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P2066 GMC Code - Fuel Level Sensor 2 Performance

Quick Answer

The P2066 GMC code indicates a problem with the fuel level sensor 2 performance in the vehicle. Common causes include Faulty fuel level sensor, Damaged or corroded wiring connected to the sensor, ECM malfunction. 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 GMC indicates Fuel Level Sensor 2 Performance.
Common causes
Common causes include Faulty fuel level sensor, Damaged or corroded wiring connected to the sensor, ECM malfunction.
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 09, 2024
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Code P2066 GMC Description

The P2066 GMC code indicates a problem with the fuel level sensor 2 performance in the vehicle. The fuel level sensor is responsible for sending fuel level information to the vehicle's engine control module (ECM) so that the fuel gauge can accurately display the amount of fuel in the tank. When this sensor is not functioning properly, it can lead to inaccurate readings on the fuel gauge, which can cause inconvenience to the driver and potentially lead to running out of fuel unexpectedly.

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

Common Causes of P2066 GMC

  1. Faulty fuel level sensor
  2. Damaged or corroded wiring connected to the sensor
  3. ECM malfunction
  4. Fuel system contamination
  5. Electrical issues such as a blown fuse or relay

Symptoms of P2066 GMC

  1. Inaccurate fuel gauge readings
  2. Fluctuating fuel gauge readings
  3. Check Engine Light illuminated
  4. Poor fuel efficiency
  5. Engine stalling

How to Fix P2066 GMC

  1. Diagnose the issue by using a scan tool to read the code and confirm the problem with the fuel level sensor.
  2. Inspect the wiring and connections for any damage or corrosion and repair or replace as necessary.
  3. Test the fuel level sensor's resistance and output voltage to determine if it is functioning correctly.
  4. Replace the fuel level sensor if it is found to be faulty.
  5. Clear the code and test drive the vehicle to ensure the repair was successful.

Cost to Fix P2066 GMC

The typical repair costs for addressing a P2066 GMC code related to the fuel level sensor 2 performance can range from $200 to $500, including parts and labor. However, the specific costs can vary depending on the make and model of the vehicle, the location of the repair shop, and the extent of the issue. It is recommended to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your specific circumstances. Keep in mind that additional diagnostic time and labor rates may apply.

What does this mean?

Tech Notes for P2066 GMC

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.



There is a factory service bulletin for the following GMC models:

2007 GMC Sierra 3500 Chassis Cab

2008 GMC Sierra 3500 Chassis Cab

2009 GMC Sierra 3500 Chassis Cab

2007-2009 GMC Sierra 3500 Chassis Cab Factory Service Bulletin ODBII Code P2066











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Information for Specific GMC Models

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.

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