What causes a U3319 code?

U3319 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 U3319 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U3319 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

U3319

Manufacturer-specific network code U3319

What it means

Signal plausibility error on the private network. The module is receiving a signal that is electronically valid but architecturally impossible.