What causes a SPN 2635 code?

SPN 2635 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 2635 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2635 active.

How do I fix SPN 2635?

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 2635

SPN 2635 FMI 2 / 10 / 15 Turbocharger Wastegate Actuator Issue

What it means

Indicates a performance or position error within the turbocharger wastegate actuator system, or an unexpected boost pressure condition.