What causes a SPN 523822 code?

SPN 523822 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 523822 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 523822 active.

How do I fix SPN 523822?

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 523822

Auxiliary brake switch fault

What it means

This code signifies a fault with an auxiliary brake switch, such as a parking brake switch or a supplemental braking system switch. The likely root cause is a faulty switch or wiring issue.