Technical Description of OBD-II Trouble Code
The input for this code is “Fuel Level Sensor B Circuit Low Input”.
What does that signify?
This particular diagnostic trouble code is applicable to all engines equipped with OBDII, but it is more commonly found in certain Chrysler, GM, Ford, Lincoln, Mercury, Honda/Acura, Kia, Mazda, Mercedes Benz, Mitsubishi, Infiniti, Nissan, and Subaru vehicles.
The Fuel Level Sensor (FLS) is typically located in the fuel tank, specifically in the top part where the fuel pump module is situated. Its main function is to convert the mechanical fuel level into an electrical signal for the Powertrain Control Module (PCM). The PCM then shares this information with other controllers through the vehicle’s data communication bus.
The PCM uses the voltage signal from the FLS sensor to determine the amount of fuel in the tank, monitor fuel usage, and calculate fuel economy. If the input voltage does not match the normal operating voltages stored in the PCM’s memory, this code is triggered. The PCM also checks the voltage signal from the FLS sensor during the initial Key On phase.
P2067 is usually set due to electrical issues related to the FLS sensor circuit. These issues should not be ignored during the troubleshooting process, especially when dealing with intermittent problems.
The troubleshooting steps may vary depending on the manufacturer, type of FLS sensor, and wire colors. To determine the location of the “B” circuit, refer to a vehicle-specific repair manual.
Other related trouble codes for the fuel level sensor B circuit include:
Severity & Symptoms
This code is usually not severe because it is an electrical failure that the PCM can compensate for. The compensation typically results in the fuel gauge constantly reading either Empty or Full.
Symptoms of a P2067 engine code may include:
Potential Causes
The common causes for this code to be triggered are:
Diagnostic and Repair Procedures
A good starting point is to search for any technical service bulletins (TSBs) related to your specific vehicle. The vehicle manufacturer may have a PCM flash/reprogram available to address this issue, so it’s worth checking before going down a potentially incorrect path.
For example, Ford products may experience a false code if an aftermarket remote start system has been installed. There is a TSB that covers this issue, and it should be followed to properly diagnose the condition. The TSB also covers auxiliary fuel tanks, recommending against using gravity feed tanks and refueling Ford trucks with the ignition switch in the off position.
Next, locate the Fuel Level Sensor (FLS) in your vehicle. It is usually mounted in the fuel tank or the top part of the fuel tank/fuel pump module. Once found, visually inspect the connector and wiring for any signs of scraping, rubbing, bare wires, burn spots, or melted plastic. Disconnect the connector and carefully examine the terminals inside for any signs of burning or corrosion. If cleaning is necessary, use electrical contact cleaner and a plastic bristle brush. After cleaning, apply electrical grease to the terminals.
If you have a scan tool, clear the diagnostic trouble codes from memory and check if the P2067 code returns. If it does not, then the issue was most likely related to the connections.
The fuel tank connections are the most common area of concern for this code, as they often experience corrosion issues.
If the P2067 code does return, further testing of the FLS sensor and its associated circuits is necessary. With the Key Off, disconnect the electrical connector at the FLS sensor. Connect a Digital Voltmeter (DVOM) black lead to the ground or low reference terminal at the FLS sensor wiring harness connector. Connect the red lead of the Digital Voltmeter to the signal terminal at the FLS sensor wiring harness connector. Turn the Key On Engine Off and check the manufacturer’s specifications. The voltmeter should read either 12 volts or 5 volts. If the voltage is incorrect, repair the power or ground wire, or replace the PCM.
If the previous test passed, connect one lead of an ohmmeter to the signal terminal at the FLS sensor and the other lead to the ground or low reference terminal at the sensor. The ohmmeter reading should not be zero ohms or infinite. Refer to the manufacturer’s specifications for the resistance of the sensor to accurately test the resistance to fuel level. For example, a half tank of fuel might read 80 ohms. If the ohmmeter readings do not pass, replace the FLS.
If all previous tests have passed and the P2067 code continues to appear, it is likely that the FLS sensor has failed. However, a failed PCM cannot be ruled out until the FLS sensor has been replaced. If unsure, seek assistance from a trained automotive diagnostician. PCMs must be programmed or calibrated to the vehicle for correct installation.
