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P2066 is a diagnostic trouble code (DTC) for "Fuel Level Sensor “B” Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Fuel Level Sensor “B” Performance
P2066 is an OBD-II generic code for the engine control module (ECM) detecting the fuel level sensor “B” performance. The sensor output voltage is not accurate when compared to the fuel level sensor “A”.
The engine control module (ECM) uses fuel level sensors A and B output voltages to determine the vehicle's fuel control. The two fuel senders are used on vehicles that have a dual bladder or a dual sump fuel tank.
The sensor does not move indicating the fuel is going down after a certain amount of miles are driven. (e.g., it is after 100km or 62 miles for a Chevrolet)
There is a difference between the two sensors of about 7 gallons after about 200 km or 120 miles are driven, or for more than 20 minutes of driving.
The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.
The fuel system may not reflect how much fuel is in the fuel tank.
The vehicle may run out of fuel if the fuel tank sensor is not accurate.
Scans for codes and documents any codes in the ECM, and then looks at the freeze frame data for failure.
Checks the sensor A and B to compare the readings for fuel level and compares it to the actual fuel level.
Checks the fuel level sensor B for the proper resistance with a multimeter.
Follows the manufacturer pinpoint tests for the diagnosis and replacement of the fuel level sensor B.
Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.
Failing to clear the ECM codes after the codes are fixed so the ECM will enable the system to be normal again.
Replacing the fuel level sensor without first checking the fuel transfer pump is working to transfer the fuel from one side to another if vehicle is equipped.
Code P2066 is for a performance problem with the fuel level sensor B. Vehicles that use this second sensor may also have a transfer pump that may be failing and will cause the unequal fuel levels in the two sides of the fuel tank. Keep this in mind when diagnosing the code and look at other codes that may also be present.
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