What causes a SPN 3327 code?

SPN 3327 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 3327 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3327 active.

How do I fix SPN 3327?

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 3327

J1939 SPN 3327 — Body/Chassis parameter

What it means

Aftertreatment System Intake Gas Sensor Power Supply Circuit - Voltage Below Normal, or generic Body/Chassis parameter data error. Typically indicates a loss of data or power related to body-specific functions communicated over the J1939 data link.