What causes a SPN 1968 code?

SPN 1968 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 1968 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1968 active.

How do I fix SPN 1968?

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

Log in Sign up

J1939 SPN

SPN 1968

Exhaust Manifold Pressure Sensor Signal High

What it means

Signal from the exhaust back pressure sensor is above the normal operating range.

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free