What causes a SPN 3108 code?

SPN 3108 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 3108 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3108 active.

How do I fix SPN 3108?

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 3108

J1939 SPN 3108 — Body/Chassis parameter

What it means

This code indicates a generic fault or abnormal signal received regarding Electrical System Voltage or the Body/Chassis parameter interface. It often pertains to improper battery potential (VBAT) sensed by the body controller or a configuration mismatch.