OBD-II code · Powertrain (generic, extended)
P251E PTO Engine Shutdown Circuit Low
The PTO engine-shutdown command line reads stuck low — usually a short to ground or a permanently asserted shutdown request. The ECM may treat this as an active shutdown command and refuse to start or keep the engine running while in PTO mode.
Is it safe to drive with P251E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShutdown wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
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
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.