What causes a SPN 172 code?

SPN 172 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 172 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 172 active.

How do I fix SPN 172?

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 172

Intake Air Temperature

What it means

Engine air inlet temperature

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

Log in Sign up free