Powertrain, generic (extended)

P255A PTO Speed Selector Sensor/Switch 2 Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P255A belongs to the second PTO speed selector input, which lets the operator call up a further preset working speed in addition to selector 1. The controller finds no valid state on this line: a wire is broken, a connector is off, or the switch contact never closes. A real example of such a second input is the VSIM module of 2017 Ram chassis cabs, where grounding the PTO idle speed 2 wire (W542) selects Remote RPM Preset 2; it overrides preset 3 but gives way to preset 1. With that wire open, the second preset simply cannot be reached while preset 1 still works. No manufacturer publishes P255A. P254A is the same fault on selector 1; P255B to P255E describe the other failure types of selector 2.

Likely causes

Broken wire between selector 2 and the module
Upfitter connector for selector 2 not mated
Selector 2 contact no longer closes

Symptoms

  • Second preset speed unavailable
  • Selector 1 presets still work

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–300
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pto speed selector 2wiring harness

Related codes

P255BP255CP255DP255EP254A

References: law.cornell.edu, http:.