What causes a U3323 code?

U3323 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 U3323 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U3323 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

U3323

Manufacturer-specific network code U3323

What it means

Node configuration mismatch. The master controller recognizes a module on the bus that does not belong to the vehicle architecture.