What causes a P1031 code?

P1031 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 P1031 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1031 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.

OBDIY

OBD-II

P1031

Vehicle speed acceleration/deceleration diagnostic fault

What it means

The Engine Control Module (ECM) has detected an implausible rate of change in vehicle speed (acceleration or deceleration) that does not match the physical capabilities of the vehicle or engine load data.