What causes a U0944 code?

U0944 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 U0944 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0944 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

U0944

Network/CAN bus communication code U0944

What it means

Invalid data received from the Sunroof Control Module. The vehicle cannot communicate properly with the module that operates the panoramic roof or sunroof.