What causes a SPN 3822 code?

SPN 3822 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 3822 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3822 active.

How do I fix SPN 3822?

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 3822

J1939 SPN 3822 — Body/Chassis parameter

What it means

SPN 3822 generally refers to a fault within the 'Auxiliary Signal #2' or a specific body/chassis integration parameter. It indicates that the ECM is receiving an out-of-range signal or lacks communication with the body builder equipment circuit.