OBD-II code · Powertrain (generic, extended)
P251F PTO Engine Shutdown Circuit High
The PTO engine-shutdown command line reads stuck high — typically a short to battery voltage. The ECM cannot pulse the line low to acknowledge a shutdown request, so the operator-side safety chain is effectively disabled.
Is it safe to drive with P251F?
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 battery voltage
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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.