What causes a U0837 code?

U0837 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 U0837 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0837 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

U0837

Network/CAN bus communication code U0837

What it means

Lost communication with the Fuel Injector Control Module (FICM) 'B'. This indicates the main ECU is not receiving data from the secondary injection controller.