What causes a U0841 code?

U0841 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 U0841 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0841 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

U0841

Network/CAN bus communication code U0841

What it means

Lost communication with the Fuel Pump Control Module. The ECU has lost the ability to command or monitor the fuel lift pump or high-pressure controller.