What Does P2066 Mean?
The control module has detected that fuel level sensor B signal is not performing within expected parameters, showing erratic, implausible, or inconsistent readings. The sensor may be providing a signal that doesn't correlate with actual fuel consumption or other sensor inputs.
Common Causes
35%
Partially failed fuel level sensor with intermittent or erratic resistance changes
25%
Fuel tank slosh or vehicle angle causing abnormal float movement patterns
20%
Contamination on sensor resistor card causing inconsistent readings
15%
Intermittent connection at sensor connector causing signal dropouts
5%
Incorrect sensor calibration or mismatch between sensor and fuel tank
Diagnostic Steps
1
Step 1: Monitor fuel level sensor B signal with scan tool during vehicle operation to observe erratic behavior
2
Step 2: Compare fuel level sensor B reading with sensor A reading and calculate expected fuel consumption
3
Step 3: Remove sensor and bench test by manually moving float while measuring resistance at multiple points
4
Step 4: Inspect sensor resistor card for contamination, corrosion, or worn tracks
5
Step 5: Verify proper sensor installation, float arm freedom of movement, and absence of tank deformation
Estimated Repair Cost
$250 - $650
Parts + labor, varies by vehicle and location
The control module has detected that fuel level sensor B signal is not performing within expected parameters, showing erratic, implausible, or inconsistent readings. The sensor may be providing a signal that doesn't correlate with actual fuel consumption or other sensor inputs.
The most common cause of P2066 (Fuel Level Sensor "B" Circuit Performance) is: Partially failed fuel level sensor with intermittent or erratic resistance changes
Typical repair costs for P2066 range from $250 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but fuel gauge will provide unreliable information. Risk of running out of fuel if driver relies on inaccurate readings.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2066 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System (Monitoring)
Difficulty
Type
Generic (SAE)
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