What causes a SPN 5312 code?

SPN 5312 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 5312 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 5312 active.

How do I fix SPN 5312?

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 5312

Intake Manifold Pressure Very Low

What it means

The engine control unit detects that the intake manifold pressure is significantly lower than the commanded boost pressure for the current engine load/speed.