What causes a SPN 2159 code?

SPN 2159 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 2159 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2159 active.

How do I fix SPN 2159?

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 2159

Auxiliary Pressure Sensor 1 Bank 1

What it means

General sensor fault for a secondary pressure monitoring circuit on the engine block.

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

Log in Sign up free