What causes a U0025 code?

U0025 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 U0025 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0025 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

Log in Sign up

OBD-II

U0025

Low Speed CAN Communication Bus (-) Low

What it means

The negative line of the low-speed CAN network is shorted to ground.

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free