P2066 2018 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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 Chevrolet Silverado Code
What does the OBDII code P2066 mean on a 2018 Chevrolet Silverado?
The P2066 code indicates a performance issue with the secondary fuel level sensor, which monitors fuel levels in dual-tank systems.
What are the common symptoms of code P2066 in a 2018 Chevrolet Silverado?
Symptoms may include inaccurate fuel level readings, a check engine light, or erratic behavior in the fuel gauge.
What causes the P2066 code to appear on a 2018 Chevrolet Silverado?
Causes can include a faulty secondary fuel level sensor, wiring issues, module communication errors, or contamination in the fuel tank.
Can driving with the P2066 code damage my 2018 Silverado?
While it may not cause immediate damage, inaccurate fuel level readings can lead to running out of fuel unexpectedly, potentially stranding you.
How can I diagnose the P2066 code on my Silverado?
Start by scanning for related codes, inspecting the wiring and connectors to the secondary fuel level sensor, and testing the sensor’s functionality.
What repairs can fix the P2066 code on a 2018 Chevrolet Silverado?
Repairs may involve replacing the secondary fuel level sensor, repairing damaged wiring, cleaning the fuel tank, or updating the vehicle’s software.
How much does it cost to fix the P2066 code on a Silverado?
Repair costs can range from $150 to $500, depending on whether the sensor or wiring needs replacement.
Can a software update resolve the P2066 code?
In some cases, a software update for the fuel management system may resolve communication errors contributing to the code.
Is the P2066 code specific to dual-tank systems?
Yes, the P2066 code typically applies to vehicles with dual-tank systems where a secondary fuel level sensor is present.
When should I seek professional help for the P2066 code?
If you’re unable to diagnose or repair the issue after basic checks, or if the code persists, consulting a qualified mechanic is recommended.
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