What causes a SPN 3405 code?

SPN 3405 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 3405 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3405 active.

How do I fix SPN 3405?

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 3405

J1939 SPN 3405 — Body/Chassis parameter

What it means

SPN 3405 typically refers to the Door Lock Actuator / Central Locking System outputs within the Body Controller. It indicates an electrical fault (open circuit, short to ground, or short to battery) in the circuit controlling the cab door locks.