OBD Codes List

Diagnostic reference · P255A

P255A

PTO Speed Selector Sensor/Switch 2 Circuit/Open

System
Speed and idle control (P code)
Lamp
Check Engine Light
Category
Powertrain - Computer and Auxiliary Controls

What it means

P255A means PTO Speed Selector Sensor/Switch 2 Circuit/Open.

Where it lives

For P255A, the sensor sits on the circuit this code reports. The description of P255A reports the sensor as open.

Check these first

  • An open in the PTO speed selector sensor 2 circuit
  • A failed PTO speed selector sensor 2
  • Corrosion at the PTO speed selector sensor 2 connector
  • A blown PTO speed selector 2 circuit fuse

What to do next

  1. Read PTO speed selector sensor 2 on a scan tool
  2. Check the PTO speed selector 2 circuit fuse
  3. Test the PTO speed selector sensor 2 circuit for an open
  4. Inspect the PTO speed selector sensor 2 connector for corrosion
  5. Replace the PTO speed selector sensor 2 if the circuit tests good
  6. Clear the code and retest

Look up another code

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.