P251D
PTO Engine Shutdown Circuit/Open
The PTO engine-shutdown command line is open. This safety input lets a connected work attachment (or operator switch) request an immediate engine shutdown — for example when an interlock is opened on a stationary aerial work platform. With the line broken, the safety shutdown cannot be commanded.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Broken shutdown wire or unplugged work attachmentCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Pto Shutdown Circuit
- Wiring Harness
P251D is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.