P255A

What it means

The second PTO speed-selector switch input is open. Switch 2 typically encodes a binary or multi-bit code together with switch 1 — together they select one of several preset PTO speeds. With switch 2 broken, only the half of the bit pattern is available, so several presets cannot be reached.

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

• Open wire or unplugged switch

  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 P255A diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?