What causes a SPN 3059 code?

SPN 3059 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 3059 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3059 active.

How do I fix SPN 3059?

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 3059

SPN 3059: EGR Coolant Flow Catalyst Monitor Damage

What it means

Indicates that the engine control module has detected an efficiency issue or potential damage to the Exhaust Gas Recirculation (EGR) cooling system, specifically relating to how the system monitors temperature and catalyst interaction.