What causes a P0519 code?

P0519 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 P0519 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0519 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

P0519

P0519 Idle Control System Performance Malfunction

What it means

The Engine Control Module detects that the engine idle speed is outside of the calibrated range despite sending commands to the idle air control system or electronic throttle body.