Severity and Symptoms
The severity is generally not too serious. Because it’s an electrical failure, the PCM can compensate for it. Compensation typically means the fuel gauge reads empty or full all the time.
Symptoms of engine code P2067 may include:
- Malfunction Indicator Light (MIL) illuminated
- Perceived decrease in fuel economy
- Reduced distance to empty mileage
- Incorrect fuel level on gauge in instrument cluster – always reads inaccurately
Potential Causes
Typically, the causes for this code to set are:
- Short to ground in signal circuit to FLS sensor – possible
- Failed FLS sensor/internal short circuit – probable
- Failed PCM – unlikely
Diagnostic and Repair Procedures
A good starting point is always searching for a Technical Service Bulletin (TSB) for your specific vehicle. The vehicle manufacturer may have a PCM flash/reprogramming to address this issue, and it’s worth checking before discovering you’ve taken a long/wrong path.
A good example of this is on Ford products where an aftermarket remote start system was installed. This can cause a false code to set. There is a TSB covering this topic that should be followed to properly diagnose this condition. Auxiliary fuel tanks are also covered in this TSB. Gravity-fed tanks are not recommended for use on these systems and when refueling Ford trucks. It’s recommended to fill main tanks with ignition switch in off position.
Next, locate the Fuel Level Sensor (FLS) on your specific vehicle. This sensor is typically mounted in the fuel tank or possibly even on top of the fuel tank module/fuel pump. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, bare wires, burns, or melted plastic. Separate the connector and carefully inspect the terminals (metal parts) inside the connector. See if they appear burned or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if terminal cleaning is needed. Let dry and apply electrical grease where terminals make contact.
If you have a scan tool, clear diagnostic codes from memory and see if P2067 code returns. If not, connections were likely your problem.
This is the most common area of concern for this code, as fuel tank connections have the highest incidence of corrosion problems.
If P2067 code returns, we’ll need to test the FLS sensor and its associated circuits. With key off, disconnect electrical connector from FLS sensor. Connect black wire of digital voltmeter (DVOM) to ground or low reference terminal at FLS sensor wiring harness connector. Connect red wire of digital voltmeter to signal terminal at FLS sensor wiring harness connector. Turn key to engine off position. Check manufacturer specifications; voltmeter should read 12 volts or 5 volts. If voltage is incorrect, repair power or ground wire or replace PCM.
If previous test passed, connect one ohmmeter wire to FLS sensor signal terminal and other wire to sensor ground or low reference terminal. Ohmmeter reading should not equal zero ohms nor be infinite. Check manufacturer specifications for sensor resistance to accurately test fuel level resistance (1/2 fuel tank may read 80 ohms). If ohmmeter readings fail, replace FLS.
If all previous tests passed and you continue to get P2067, this would most likely indicate a faulty FLS sensor, though a faulty PCM cannot be ruled out until FLS sensor has been replaced. When in doubt, seek assistance from a qualified automotive diagnostician. PCMs must be programmed or calibrated to the vehicle to be properly installed.