Fuel Level Sensor B Circuit Low
Diagnostic trouble code P2067 indicates that the powertrain control module (PCM) has detected a voltage signal from the secondary fuel level sensor (Sensor B) circuit that falls below the expected minimum threshold. This typically occurs in vehicles with saddle-style or dual fuel tanks when the sensor's signal wire is shorted to ground or the sensor itself has failed.
While this code will not cause direct engine damage, an inaccurate fuel gauge can easily lead to running out of fuel and becoming stranded. It should be diagnosed soon to ensure reliable fuel level monitoring.
Common symptoms
- Illuminated Check Engine Light
- Inaccurate or erratic fuel gauge readings
- Fuel gauge permanently stuck on empty
- Vehicle runs out of fuel while the gauge shows fuel remaining
- Decreased calculated driving range on the instrument cluster
Likely causes
- Faulty fuel level sensor B (sending unit)
- Short to ground in the fuel level sensor B wiring harness
- Corroded, damaged, or loose electrical connector at the fuel tank
- Mechanical binding of the fuel level sensor float arm
- Faulty instrument cluster or PCM (rare)
What to check before replacing parts
Connect a scan tool and monitor the live data for Fuel Level Sensor B voltage.
Look for: Look for a voltage reading that is stuck near 0 volts or does not change when fuel is added or the vehicle is rocked.
Visually inspect the wiring harness and connectors leading to the secondary fuel tank sending unit.
Look for: Check for chafed wires touching the chassis (short to ground), severe corrosion, or backed-out pins in the connector.
Disconnect the sensor and measure its resistance with a multimeter while moving the float arm (if accessible).
Look for: The resistance should change smoothly without any dropouts or open circuits as the float moves from empty to full.
Test the signal wire between the sensor connector and the PCM/instrument cluster for a short to ground.
Look for: With both ends disconnected, continuity to ground on the signal wire indicates a short that must be repaired.
Verify the 5-volt reference signal and ground at the sensor connector.
Look for: A missing 5-volt reference or a poor ground indicates an issue upstream in the wiring, PCM, or instrument cluster.
This page explains the generic P2067 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
Gear guide: Best OBD2 ScannersRead this code yourself next time — from $20 Bluetooth dongles to bidirectional scan tools.Rather have a pro handle it? Find a vetted local mechanic.