Fuel Level Sensor ‘B’ Performance
Table of contents
P2066 CHEVROLET Possible Causes
- Faulty Fuel Level Sensor
- Fuel Level Sensor harness is open or shorted
- Fuel Level Sensor circuit poor electrical connection
How do I fix code P2066 CHEVROLET?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
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Cost of diagnosing the P2066 CHEVROLET code
The cost of diagnosing the P2066 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2066 CHEVROLET Description
E85 Fuel Applications
For regular unleaded fuel, the Engine Control Module (ECM) monitors a constant signal. When the vehicle has approximately 20% or greater ethanol for E85 applications, the ECM controls a pulse cycle signal where it monitors the signal and calculates the fuel level percentage only during the on the pulse of approximately 100 ms.
Single Fuel Tank Applications
For a single tank application, the fuel level sensor changes resistance in response to the fuel level. The ECM monitors the signal circuit of the fuel level sensor and the type of fuel in order to determine the fuel level.
When the fuel tank is full, the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the 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.
Dual Fuel Tank Applications
The primary fuel level sensor and, the secondary fuel level sensor change resistance based on fuel level. The 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.