What causes a SPN 5159 code?

SPN 5159 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 5159 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 5159 active.

How do I fix SPN 5159?

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

J1939 SPN

SPN 5159

Cummins fault code 5159

What it means

Aftertreatment 1 Exhaust Gas Pressure - Data Erratic, Intermittent, or Incorrect. The ECM has detected that the exhaust gas pressure signal is not stable or is providing values inconsistent with engine operating conditions.