What causes a U0446 code?

U0446 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 U0446 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0446 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

U0446

Network/CAN bus communication code U0446

What it means

Invalid data received from the Tire Pressure Monitor System (TPMS) Module. The receiver is reporting tire data that is logically impossible or corrupted.