P255CPTO Speed Selector Sensor/Switch 2 Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P255C means the input of PTO speed selector 2 reads lower than the controller's bottom limit, usually because the signal wire has a short to chassis ground or the switch is shorted inside. On designs where a grounded line is itself the command, as with the switch-to-ground inputs of Ram's 2017 VSIM, a short looks exactly like a permanently held preset 2 request; the controller can only tell the difference when the selector is resistor-coded or monitored with a diagnostic current. No manufacturer publishes P255C. P255D is the high-side fault on the same input, P254C the low fault on selector 1. Possible results are an engine that stays at the second working speed whenever PTO is active, or a PTO that the controller blocks.
- What you may notice
- Engine always runs at the second preset in PTO mode
- PTO blocked
- Likely causes
- LikelySelector 2 wire shorted to chassis ground
- PossibleSelector 2 shorted internally
- RareHarness pinched under a body mounting
- 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.