What causes a SPN 6958 code?

SPN 6958 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 6958 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 6958 active.

How do I fix SPN 6958?

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 6958

Cummins fault code 6958

What it means

Intake Manifold 1 Pressure - Data Erratic, Intermittent, or Incorrect. This specifically points to a signal drift or rationalization error detected by the ECM.