What causes a SPN 3102 code?

SPN 3102 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 3102 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3102 active.

How do I fix SPN 3102?

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 3102

J1939 SPN 3102 — Body/Chassis parameter

What it means

SPN 3102 is a generic J1939 parameter code indicating a failure or missing signal related to the Body/Chassis interface. It often triggers when the Engine Control Module (ECM) expects data from a body-mounted accessory (like a PTO, crane, or lift) that is not communicating correctly.