What causes a U3433 code?

U3433 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 U3433 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U3433 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

U3433

Manufacturer-specific network code U3433

What it means

Communication error with the Suspension Control Module. The truck's air leveling or active dampening system is no longer coordinating with the rest of the network.