P251FPTO Engine Shutdown Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P251F is the high-side fault of the PTO engine shutdown input: the voltage stays near supply level where the module expects a defined switching state. A shutdown wire touching a powered circuit in the body harness, a missing ground on the equipment controller, or an add-on module that drives the line permanently are typical. The main risk is that a real stop request from the body equipment is no longer recognised, or that the module locks out PTO operation as a precaution. Public maker documentation for P251F was not found; CARB covers PTO units in its OBD rules, and GM's PIP6108 on P251A illustrates how ground faults distort PTO-related inputs on medium-duty trucks. P251D is the open-circuit and P251E the low-level variant.
- What you may notice
- Engine does not stop when equipment shutdown is triggered
- PTO operation blocked
- Likely causes
- LikelyShutdown wire shorted to a powered circuit in the body harness
- PossibleBody equipment controller without ground
- RareRetrofitted control module holding the line high
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.