Code result
P251F
PTO Engine Shutdown Circuit High
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Shutdown wire shorted to battery voltage
highOne of the most commonly reported causes for this code — check this first.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Supply wire pinched against B+ source
lowLess common, but worth ruling out after the more likely causes.
Related help
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