What causes a SPN 2033 code?

SPN 2033 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 2033 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2033 active.

How do I fix SPN 2033?

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 2033

SPN 2033 J1939 Network Communication Loss (Safety)

What it means

This fault indicates a communication failure on the J1939 data link where the Safety Control Unit (SCU) or Adaptive Cruise Control (ACC) module is no longer transmitting expected data.