What causes a SPN 432 code?

SPN 432 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 432 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 432 active.

How do I fix SPN 432?

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 432

J1939 SPN 432 — Fuel/Air parameter

What it means

Accelerator Pedal Position 1 Idle Validation Switch. This fault occurs when the ECM detects an inconsistent state between the throttle pedal position and the idle validation switch.