P2067 on Chevrolet: How to Diagnose & Fix

The C6 Corvette does not use a single fuel tank. Because the rear transaxle and torque tube run down the centerline of the car, the fuel is carried in two connected saddle tanks straddling the driveline, and each tank carries its own level sender. The driver-side tank holds the fuel pump module and the primary sender; the passenger-side tank holds the secondary sender (Sensor 'B'), which is the one P2067 reports on. The secondary sender is a wiper arm riding on a printed resistive card, and it is the resistive card and its contact surface that fail. Two mechanisms are documented by C5/C6 owners. The first is contamination: sulfur and ethanol residue in pump gasoline plate a film onto the contact track, and once the wiper starts skipping across a corroded or scored section of the card the ECM sees the signal collapse toward ground. The second is plain mechanical wear — the wiper cuts a groove into the card at the fuel levels the car spends most of its life at, and once it wears through the circuit reads as a short. Either way the signal voltage on the Sensor 'B' circuit drops below roughly 0.2 V and holds there, and the PCM sets P2067. Owners describe the gauge dropping to empty immediately after a fill-up, a 'Low Fuel' and 'Service Fuel System' message on the DIC, the range-to-empty readout going blank or nonsensical, and a check engine light that returns within a drive cycle or two of being cleared. Because the fault is contact-related rather than a hard open, it is often intermittent at first, appearing at one particular fuel level and then clearing as the float moves past the bad spot on the card, before eventually becoming permanent. Note that the wrong-year replacement sender is a genuine trap here: the resistance range specified for the sender changed during the C6 run, so a brand-new but incorrectly catalogued sender can leave the gauge reading wrong and the code still set. Owners also correlate which tank is at fault with when the gauge misbehaves, since the passenger-side tank is emptied first, its fuel transferred continuously to the driver-side tank where the pump sits.

The in-tank fuel-level sender's resistive card wears, causing the fuel gauge to read inaccurately — stuck on Empty or Full, bouncing/fluctuating, or dropping to E with a false low-fuel warning. The sender is integral to the fuel pump module, so a worn card typically means dropping the tank. It is a well-known GM truck problem; on high-mileage trucks technicians recommend replacing the complete fuel pump module rather than just the sender.