What causes a P2065 code?

P2065 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P2065 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2065 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P2065

P2065 Fuel Level Sensor B Circuit Malfunction

What it means

Indicates a circuit error for the secondary fuel level sensor typically used in dual-tank configurations or specialized saddle tanks on heavy-duty chassis. The ECM or Body Controller is receiving a voltage signal outside of the expected range from Sensor B.