What causes a SPN 1249 code?

SPN 1249 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 1249 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1249 active.

How do I fix SPN 1249?

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 1249

Accelerator Pedal Signal #1 Shorted High

What it means

Indicates the primary voltage signal from the accelerator pedal sensor is above the expected range, likely due to a short to 5V supply.