P251EPTO Engine Shutdown Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P251E reports that the PTO engine shutdown input reads too low. Whether low means stop now or all clear depends on the maker's wiring, so the practical effect varies: the module may treat the line as an active stop request and refuse to keep the engine running in PTO mode, or it may simply flag the line as shorted and ignore it. Typical causes are a chafed wire grounded on the frame, a corroded connector at the body interface or a stop switch shorted to ground. No manufacturer publishes P251E with a threshold or MIL rule; CARB defines the PTO unit, and GM's PTO bulletin PIP6108 for P251A shows that ground quality plays a big part in these body-builder circuits. Sibling codes: P251D for an open line, P251F for a high reading.
- What you may notice
- Engine stops or will not stay running while PTO is used
- PTO function disabled
- Likely causes
- LikelyShutdown wire chafed through to chassis ground
- PossibleCorroded connector at the body builder interface
- RareEquipment stop switch shorted to ground
- 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.