The code indicates that the control circuit for the fuel volume regulator B is detecting a voltage higher than expected. This suggests a short to power or a faulty regulator affecting fuel delivery.
The regulator may have an internal short that feeds excess voltage into its control circuit, causing the high reading.
A damaged wire or corroded connector can feed battery voltage directly into the regulator's control circuit.
Some vehicles use a separate module that drives the regulator; a fault there can raise circuit voltage.
A malfunction inside the powertrain control module can output excessive voltage, but this is uncommon.
In most cases the PCM is not the cause; the fault is usually the regulator, its wiring, or a short in the control circuit.
A short in the fuel pump circuit can affect the regulator's control voltage, so the pump wiring should be inspected as part of the diagnosis.
Yes, many models use a replaceable regulator that can be inspected or swapped to clear the code.
Fuel system pressure should be relieved before disconnecting components to prevent spills or injury.