What causes a U3044 code?

U3044 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 U3044 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U3044 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.

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OBD-II

U3044

Manufacturer-specific network code U3044

What it means

Loss of communication with the emissions system or DEF/AdBlue control unit. This can lead to engine derate if data is missing.

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