P255DPTO Speed Selector Sensor/Switch 2 Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P255D is stored when PTO speed selector 2 delivers a signal above the permitted maximum. A chafed wire touching a battery-fed circuit, a lost sensor ground, or an upfitter feeding 12 V into an input meant to be switched to ground are the realistic causes. Upfitter manuals show why the last point matters: Ram describes its VSIM preset inputs as switch-to-ground circuits, while GM's 2008–2014 remote set input interprets anything above 3.33 V as a speed request, so mixing up the conventions of different trucks produces readings outside the expected range. No manufacturer documents P255D publicly. P255C is the low-side code; P254D covers selector 1. The second preset may be unavailable or the PTO is shut off.
- What you may notice
- Second preset unavailable
- PTO switched off by the controller
- Likely causes
- LikelySelector 2 wire chafed against a battery-fed circuit
- PossibleUpfitter applies 12 V to a ground-switched input
- RareLost ground or return line of selector 2
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.