What causes a SPN 46 code?

SPN 46 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 46 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 46 active.

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.

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J1939 SPN

SPN 46

J1939 SPN 46 — Engine parameter

What it means

Pneumatic Start Pressure. This parameter indicates the actual pressure available to the air starter system.

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