P2066 2018 GMC Sierra Code - Fuel Level Sensor 2 Performance
Quick Answer
Diesel Engine The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor circuit poor electrical connection. 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 2018 GMC Sierra indicates Fuel Level Sensor 2 Performance.
- Common causes
- Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor circuit poor electrical connection.
- 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.
Code P2066 2018 GMC Sierra Description
The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The Fuel Pump Driver Control Module monitors the signal circuits of the primary fuel level sensor and the secondary fuel level sensor and sends the signal information to the Engine Control Module (ECM) for all further handling. The ECM uses this value in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level sensors are low, and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high, and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel gauge.
Gasoline Engine
The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The Engine Control Module (ECM) monitors the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level sensors are low, and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high, and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel gauge.
The Diagnostic Trouble Code (DTC) will be set if the ECM detects a change in fuel level of less than a specified amount (typically 3 - 10 L or 0.8 - 2.6 gal) over a specified driving distance (typically 240 - 320 km or 150 - 200 miles).
What are the Possible Causes of the DTC P2066 2018 GMC Sierra?
- Faulty Fuel Level Sensor
- Fuel Level Sensor harness is open or shorted
- Fuel Level Sensor circuit poor electrical connection
- Faulty Instrument Cluster
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2066 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2066 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P2066 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- Common symptoms include inaccurate fuel level readings on the dashboard, fluctuating fuel gauge, and potential illumination of the check engine light.
2. What can cause OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- The code P2066 can be triggered by issues such as a faulty fuel level sensor, wiring problems, poor electrical connections, or a malfunctioning fuel pump module.
3. How can I diagnose the cause of OBDII code P2066 in my 2018 GMC Sierra?
- Diagnosis typically involves checking the fuel level sensor and its wiring for any visible damages, testing the sensor's resistance, and inspecting the fuel pump module for proper functionality.
4. Is it safe to continue driving with OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- While the vehicle may still be operational, it is recommended to address the issue promptly to avoid running out of fuel unexpectedly or causing potential damage to the fuel system.
5. Can I repair OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance myself?
- Depending on your skill level, you may be able to address this issue by replacing the fuel level sensor, repairing wiring connections, or fixing any related issues. However, professional diagnosis and repair are recommended for more complex cases.
6. What are the potential repair options for OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- Repair options may include replacing the faulty fuel level sensor, repairing damaged wiring, ensuring proper electrical connections, or addressing issues with the fuel pump module.
7. How much does it typically cost to repair OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- Repair costs can vary depending on the exact cause of the issue, the cost of parts, and labor charges. It is advisable to obtain quotes from reputable mechanics or dealerships.
8. Are there any preventive measures to avoid triggering OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- Regular maintenance, such as checking the fuel system components during scheduled services, can help prevent issues that may lead to the triggering of this code.
9. Can weather conditions or rough driving affect the triggering of OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance?
- Extreme weather conditions or rough driving may not directly trigger this code, but they can potentially exacerbate existing issues with the fuel level sensor or related components.
10. Does OBDII code P2066 in a 2018 GMC Sierra related to Fuel Level Sensor 2 Performance affect vehicle performance?
- While the code itself may not directly impact performance, addressing the underlying issue promptly is important to ensure accurate fuel level readings and proper functioning of the fuel system.
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