What causes a SPN 145 code?

SPN 145 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 145 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 145 active.

How do I fix SPN 145?

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 145

Transmission Neutral Switch

What it means

Reports the electrical state of the switch indicating if the transmission is in a neutral gear.

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

Log in Sign up free