What causes a SPN 3641 code?

SPN 3641 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 3641 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3641 active.

How do I fix SPN 3641?

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 3641

J1939 SPN 3641 — Body/Chassis parameter

What it means

J1939 Body/Chassis Parameter Data Link Communication Failure. This indicates the Engine Control Module (ECM) is not receiving expected data or is receiving invalid data from the Body Controller or Chassis Module over the J1939 network.