OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P251D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBroken shutdown wire or unplugged work attachment
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Pto Shutdown Circuit, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.