P251D

What it means

The PTO engine-shutdown command line is open. This safety input lets a connected work attachment (or operator switch) request an immediate engine shutdown — for example when an interlock is opened on a stationary aerial work platform. With the line broken, the safety shutdown cannot be commanded.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Broken shutdown wire or unplugged work attachment

  high

  One of the most commonly reported causes for this code — check this first.

• Pin pushed back out of connector body

  low

  Less common, but worth ruling out after the more likely causes.

• Cracked solder joint inside the module or sensor

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P251D diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?