What causes a SPN 5006 code?

SPN 5006 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 5006 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 5006 active.

How do I fix SPN 5006?

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 5006

Allison transmission code P5006

What it means

SPN 5006 (Allison P5006) indicates a 'C1 Clutch Applied in Neutral' fault. This occurs when the Transmission Control Module (TCM) detects that the C1 clutch is physically engaged even though the selector is in Neutral.