What causes a SPN 248 code?

SPN 248 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 SPN 248 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 248 active.

How do I fix SPN 248?

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

J1939 SPN

SPN 248

J1939 Proprietary Data Link Communications Failure

What it means

Indicates a communication error on the proprietary data link, often specific to the connection between the ECM and other specialized controllers like the transmission or fuel delivery modules.