What causes a SPN 524285 code?

SPN 524285 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 524285 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 524285 active.

How do I fix SPN 524285?

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 524285

CM1 DPF Regeneration Switch Short Circuit to Ground

What it means

This code indicates that the Common Powertrain Controller (CPC) detects a low voltage state (short to ground) on the circuit dedicated to the DPF Regeneration Request Switch, even when the switch is not being depressed.