What causes a SPN 252 code?

SPN 252 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 252 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 252 active.

How do I fix SPN 252?

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 252

J1939 SPN 252 — Fuel/Air parameter

What it means

Engine Time/Date or Fuel Air parameter inconsistency. This usually refers to a loss of memory within the control module.

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

Log in Sign up free