What causes a U0445 code?

U0445 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 U0445 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0445 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

U0445

Network/CAN bus communication code U0445

What it means

Invalid data received from the Gateway B module. Similar to Gateway A, this relates to a secondary network hub on the vehicle's data bus.