What causes a SPN 2105 code?

SPN 2105 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 2105 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2105 active.

How do I fix SPN 2105?

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 2105

Transmission Output Shaft Speed Not Available

What it means

The J1939 signal for output shaft speed is missing, affecting cruise control and speedometers.

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

Log in Sign up free